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Dissertations / Theses on the topic 'Charm'
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1
Cóvacich, Daniel Souza. "Production of open charm and double open charm at LHCb." Thesis, University of Bristol, 2016. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.702306.
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Kalinin, Sergey. "Charm studies in emulsion." Université catholique de Louvain, 2006. http://edoc.bib.ucl.ac.be:81/ETD-db/collection/available/BelnUcetd-05302006-191314/.
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Neutrino-nucleon scattering is an effective way to investigate the inner structure of the nucleon, to extract the Standard Model parameters and to explore heavy quarks production dynamics. In the last decades, several experiments have been constructed to study weak interactions of neutrinos with nucleons. One of them was CERN-WA95 experiment operated by the CHORUS collaboration. It is based on a hybrid detector with nuclear emulsion as a target followed by electronic devices. Nuclear emulsion provides three dimensional spatial information with an outstanding resolution of the order of one micron. Therefore, it is ideal to detect short-lived particles. A special technique has been developed to reconstruct events in the emulsion which allows to perform a detailed investigation of events such as charmed hadrons production by neutrinos. As a result, the backround in the selected charm sample is up to six times lower compared to similar experiments. Such a method also permits to make direct measurements of some quantities instead of model fittings. This thesis is devoted to the study of the muonic decays of charmed hadrons and their production in emulsion. Manual inspection of charm events gives a complete reconstruction of charm decay topology. The extraction of the inclusive muonic branching ratio is based on the ratios per number of charged daughters in charm decay. Such an approach allows to separetely measure the muonic branching ratios for neutral and charged charm particles. Finally, normalization of the events with a muon in the final state to the charged current events gives dimuon production rate which is found compatible with the previous experiments. On top of that, preliminary results are shown for Bjorken x distribution and for a direct measurement of the Vcd Cabbibo-Kabayashi-Maskawa matrix element.
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Mahdaly, Ahdab Hashim. "Towards an old charm." Thesis, Virginia Tech, 2011. http://hdl.handle.net/10919/33388.
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Schagen, Sven Edmond Simon. "Charm in the proton an analysis of charm production in deep inelastic scattering /." [S.l. : Amsterdam : s.n.] ; Universiteit van Amsterdam [Host], 2004. http://dare.uva.nl/document/72854.
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Edwards, Adam Jacob. "A study of double-charm and charm-strange baryons in electron-positron annihilations /." May be available electronically:, 2007. http://proquest.umi.com/login?COPT=REJTPTU1MTUmSU5UPTAmVkVSPTI=&clientId=12498.
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Ghoddoussi, Farhad. "Topics in charm meson decays." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp04/mq21165.pdf.
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Nylander, Paul Andrew. "Open charm photoproduction at Zeus /." The Ohio State University, 1999. http://rave.ohiolink.edu/etdc/view?acc_num=osu1488190109869004.
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Teuscher, Richard John. "Charm and charm-strange hadron production in ep collisions at HERA as probes of confinement." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/nq28069.pdf.
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Padhi, Sanjay. "Charm jets in photoproduction at HERA." Thesis, McGill University, 2003. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=84305.
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Charm Jets in photoproduction have been studied in electron-proton collisions with the ZEUS detector at HERA, using an integrated luminosity of 120 pb-1. Jets were reconstructed using the longitudinally invariant kT-clustering algorithm. The dijet cross section for events containing at least one D*+/- charmed meson was measured as a function of various observables sensitive to hard scattering and the structure of the photon. The results are compared with predictions from leading-order parton-shower Monte Carlo simulations and with next-to-leading-order QCD calculations.<br>Differential cross sections of dijets as a function of the angle between the charm jet and the proton-beam directions in the dijet rest frame have been measured for samples enriched in direct or resolved photon events. The angular distribution shows a steep rise for resolved photon events in the photon direction, providing a clear first evidence for the existence of charm originating from the photon. The shallower rise for direct photon events as well as for the resolved photon events in the proton direction are consistent with the quark exchange diagrams.<br>The charm fragmentation function has also been measured for the first time at HERA. The fragmentation variable z is given by the ratio of E + p∥ for the D* meson and that for the associated jet, where E is the energy and p∥ the longitudinal momentum relative to the jet axis. The measured cross section was compared to different fragmentation models incorporated in both leading- and next-to-leading-order frameworks and to the results from e+ e- experiments.
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Sutton, Mark Robert. "Charm in dijet photoproduction at HERA." Thesis, University College London (University of London), 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.314378.
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Dujmić, Denis. "Open charm production at HERA-B." Access restricted to users with UT Austin EID Full text (PDF) from UMI/Dissertation Abstracts International, 2001. http://wwwlib.umi.com/cr/utexas/fullcit?p3036594.
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Peshier, André, O. P. Pavlenko, G. Soff, and Burkhard Kämpfer. "Parton kinetics for strangeness and charm production." Forschungszentrum Dresden, 2010. http://nbn-resolving.de/urn:nbn:de:bsz:d120-qucosa-32183.
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Inguglia, Gianluca. "Time-dependent CP violation in charm mesons." Thesis, Queen Mary, University of London, 2014. http://qmro.qmul.ac.uk/xmlui/handle/123456789/8296.
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CP violation is a well established phenomenon for B and K mesons, but for D0 mesons, bound states made up of a quark-antiquark pair containing a charm quark, a conclusive answer to the question whether there is CP vio- lation or not, has yet to be determined. I show here the phenomenology of time-dependent CP asymmetries in charm decays, and discuss the implica- tions of experimental tests aimed at the measurement of CP violation in the interference between mixing and decays of charm mesons, in particular when studying the decay channels D0 ! h+h (h = K; ). The decay channels considered can also be used to constrain quantities that are poorly measured or still to be investigated, such as MIX and c;eff , provided that the e ects of penguin pollution are ignored. I considered correlated production of D0 mesons at the SuperB experiment and its planned asymmetric run at the charm threshold and performed a study of simulated events, nding that a boost factor = 0:28 would not be su cient to produce competitive re- sults; the desirable resolution on the decay vertex separation between two D mesons in an event can be obtained with = 0:9. Vertex detectors play the major role in this analysis and new vertex detectors with high granular- ity might help improving these studies. The reference pixels (25 25 m pixel sensors implementing a 4T architecture with a deep n-well implant) of the Cherwell sensor, studied within the ARACHNID Collaboration, might be a candidate as a vertexing/tracking system, in particular for the layers of an SVT which are just around the beam pipe. I show the results of a study performed with data collected during a test beam at CERN, where the Cherwell sensor has been irradiated with pion beams, in terms of the charge deposited in the pixels by the charged particles passing through it, and show that this is mostly collected by the eight pixels ring surrounding the pixel hit by the particle beam. This work culminates in the de nition of the clustering algorithm used by ARACHNID.
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Peshier, André, O. P. Pavlenko, G. Soff, and Burkhard Kämpfer. "Parton kinetics for strangeness and charm production." Forschungszentrum Rossendorf, 1995. https://hzdr.qucosa.de/id/qucosa%3A22044.
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Greening, Edward. "Rare and challenging charm decays at LHCb." Thesis, University of Oxford, 2014. http://ora.ox.ac.uk/objects/uuid:0f960d89-76a1-4222-9d11-922fd7516339.
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This thesis presents two studies of charged charm meson decays using proton- proton collision data, corresponding to an integrated luminosity of 3 fb<sup>−1</sup>, recorded by the LHCb experiment. A search for D<sub>(s)</sub><sup>+</sup> → π<sup>+</sup>μ<sup>+</sup>μ<sup>-</sup> decays is performed. Rare decays of charged charm mesons have not previously been observed unlike their counterpart B meson and kaon decays. Such decays are c → u quark transitions and take place via loop diagrams within the Standard Model. Measurements of their branching fractions are an indirect test of New Physics, whose virtual contributions may enhance such quantities. No signals are observed and the 90% (95%) CL limits on the branching fractions, the most stringent to date, are found to be, B(D<sup>+</sup> → π<sup>+</sup>μ<sup>+</sup>μ<sup>-</sup>) < 2.9 (3.3) × 10<sup>-8</sup>, B(D<sub>s</sub><sup>+</sup> → π<sup>+</sup>μ<sup>+</sup>μ<sup>-</sup>) < 1.76 (1.91) × 10<sup>-7</sup>. The charge asymmetry measurement of D+ → π+π0 using π0 → e<sup>+</sup>e<sup>-</sup>γ decays is also described. Charge asymmetry in the Standard Model is expected to be small for charm meson decays. Any measured deviation from zero would be evidence of New Physics. This decay has not previously been observed at a hadron collider and the measurement acts as a 'proof of principle' study allowing a future analysis to examine the decay mode. No evidence of CP violation is found.
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Nye, J. M. "A search for charm in two-photon interactions." Thesis, Lancaster University, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.374642.
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Panella, Comellas J. "Measurement of some charm particle decay branching ratios." Thesis, University of Oxford, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.382501.
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Cali, Salvatore [Verfasser]. "Model Study of Charm Loop Effects / Salvatore Cali." Wuppertal : Universitätsbibliothek Wuppertal, 2019. http://d-nb.info/1190649721/34.
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Robins, Stephen David. "Charm production in deep inelastic scattering at HERA." Thesis, University of Bristol, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.274607.
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Cheung, Gavin. "Spectroscopy of exotic charm mesons from lattice QCD." Thesis, University of Cambridge, 2019. https://www.repository.cam.ac.uk/handle/1810/285556.
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Exotic mesons are mesons that cannot be described as a quark-antiquark pair. The number of exotic mesons has been growing every year in the charm sector and the theoretical understanding of them is often conflicted amongst the community. Some possible explanations include hybrid mesons where the quark-antiquark pair is coupled to a gluonic excitation, compact tetraquarks where four quarks are bound into a localised state and molecules which consist of pairs of extended mesons. To study exotic mesons from first principles, lattice QCD provides the framework to perform spectroscopy calculations numerically. I will give a review and describe the relevant techniques used in this thesis. After doing so, I will calculate masses of charmonium with angular momentum up to four. The results show QCD permits states with exotic quantum numbers that are not accessible by a quark-antiquark pair. I will identify states that are consistent with the quark-antiquark picture and then show that the remaining states in the extracted spectra can be interpreted to be the lightest and first excited hybrid meson supermultiplet. Whilst the mass is one quantity that can be computed, hadron spectroscopy is also concerned with the calculation of the unstable properties of resonances which can decay into meson-meson states. These meson-meson states have four quarks and could also mix with tetraquarks. I will describe how to correctly extract the energies of four quark states within lattice QCD by reviewing operators resembling meson-mesons and then constructing a general class of operators resembling tetraquarks. I will then calculate a variety of spectra in the isospin-1 hidden charm sector and the doubly charmed sector. No evidence of a bound state or narrow resonance is found in these channels. Having described how to include multi-meson states in lattice QCD, I will describe how to relate the lattice QCD spectrum to the scattering amplitudes and perform a calculation of elastic $DK$ scattering amplitudes which is relevant for the exotic $D_{s0}(2317)$. By analytically continuing the scattering amplitudes into the complex plane, I find a bound state pole near threshold which is in good agreement with what is found experimentally.
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Grancagnolo, Sergio. "Hadronic β decays to double charm final states". Chambéry, 2005. http://www.theses.fr/2005CHAMS010.
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Le travail décrit dans cette thèse est basé sur l'analyse des données enregistrées par l'expérience BaBar sur le collisionneur PEP-II à SLAC (Stanford Linear Accelerator Center, California), entre 1999 et 2002. L 'échantillon collecté correspond à 122. 1 ±0. 6 ±1. 3 millions d'événements B anti-B. L'observation dans l'expérience BaBar des particules 0_SJ*(2317)/\+ et 0_sJ(2460)/\+, découvertes en 2003, a suscité beaucoup d'intérêt pour la spectroscopie des hadrons charmés. Une revue des interprétations théoriques et des résultats expérimentaux récents est donnée. Dans la première partie de cette thèse nous avons étudié l'efficacité de reconstruction des pions de basse énergie produits dans la désintégration du méson D*. Dans la seconde partie nous avons étudié la production des nouvelles particules D_sJ dans les désintégrations hadroniques du méson B en deux quarks charmés et pour cela avons développé une technique pour reconstruire les désintégrations B→D(*)D_sJ. Après avoir mis en évidence un signal dans l'ensemble des modes recherchés (certains de ces signaux étant observés pour la première fois au monde), nous avons estimé les nombres d'événements et calculé les taux de désintégration correspondant, après rejet du fond, évaluation de l'efficacité de reconstruction et estimation des erreurs systématiques. L'ordre de grandeur des taux de désintégration mesurés est de quelques 10A-3 ; ces taux de branchement sont légèrement plus faibles que les taux de désintégration des modes correspondants B→D_s D(*), qui sont attendus du même ordre de grandeur dans l'hypothèse de la factorisation. A travers l'analyse an9ulaire nous avons mesuré les nombres quantiques du D_sJ (2460)/\+ ,/\ qui sont compatibles avec l'hypothèse J/\P =1/\+<br>The work is based on the analysis of the data collected at the BaBar experiment on the PEP-II collider at SLAC (Stanford Linear Accelerator Center, California) between 1999 and 2002. The data sample collected corresponds at 122. 1 ± 0. 6 ± 1. 3 millions of BBbar pairs. The observation by BaBar of the DsJ*(2317)+ and DsJ(2460)+ mesons, discovered in 2003, raised a lot of interest for the spectroscopy of charmed hadrons. L reviewed theoretical explanations and recent experimental results. In the first part of the thesis , l studied the reconstruction efficiency of low energy pions produced in the D* meson decay. In the second part I studied the production of the new DsJ particles in the hadronic decays of the B meson with two charm quarks. To reach this goal l developed the technique to reconstruct the decays B→DsJD(*). After clear evidence of signal on all the decay modes under study (some of them seen for the first time in the world !), l estimated the number of signal events and l computed the corresponding branching ratios, after background rejection, reconstruction efficiency evaluatlon and systematic errors estimation. The order of magnitude of the branching ratios is 10/\-3; these values are slightly smaller than the corresponding of the decays B→DsD(*) , expected of the same order in the factorisatlon hypothesis. Using angular analysis l measured the quantum numbers of DsJ(2460)+, obtaining a result compatible with the hypothesis JP=1+
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Petran, Michal. "CHARM and Strangeness in Quark-Gluon Plasma Hadronization." Diss., The University of Arizona, 2013. http://hdl.handle.net/10150/307026.
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This dissertation presents a theoretical study of soft hadron production in relativistic heavy-ion collisions. The aim is to explore the principles governing the hadronization of the expanding quark-gluon plasma (QGP) fireball, and to understand its properties. Strange hadron production and strangeness abundance in the QGP help us to look before the instant of hadronization. Consideration of entropy and charm production further enhances the reach back in time to the first instances of the heavy ion collision. Much of the ongoing effort is to demonstrate the validity of a QGP hadronization model which describes the particle production data accurately and thus allows us to carry out the above research program. We perform a centrality dependent study of multistrange hadrons from Au-Au collisions at √SNN = 62.4 GeV, data obtained at the Relativistic Heavy Ion Collider (RHIC). We show that the statistical hadronization model (SHM) well describes particle production. For all centralities, the particle production conditions are compatible with the earlier proposed critical hadronization pressure suggesting a set of universal hadronization conditions of QGP. Heavy-ion collisions at the Large Hadron Collider (LHC) present a new challenge for SHM in describing particle production at TeV energy scales. The chemical non-equilibrium model gives a good description of the hadron production in Pb-Pb collisions at √SNN = 2.76 TeV consistently as a function of centrality. Moreover, the model parameters, such as chemical freeze-out temperature, assume expected values suggested by results from previous studies at lower energies. The quark-gluon plasma fireball hadronizes at the same universal hadronization conditions, that is a common critical pressure, entropy and energy density. At LHC energies, a significant amount of charm is expected to be produced. It is therefore crucial to incorporate charm into the present description of particle production. We present a new tool, an upgraded SHARE with CHARM program, that quantifies the effect of charm on the yield of lighter hadrons and physical properties of the hadronizing fireball. In addition to light flavors (u,d,s), SHARE with CHARM describes charm hadron production and decays of charm hadrons. According to present experimental results, charm decays mainly affect the yields of multistrange particles. This dissertation begins with an introduction to the particle production in heavy-ion collisions and SHM framework, followed by a summary of results that are either published or submitted to peer-reviewed journals and others which are published as conference proceedings. Reprints of the publications are attached to the dissertation as appendices. Each appendix is prefaced with a short summary of presented results, and my contribution to these works is described.
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GROSSO, RAFFAELE. "OPEN CHARM IN PROTON-LEAD COLLISIONS WITH ALICE." Doctoral thesis, Università degli studi di Trieste, 2005. http://thesis2.sba.units.it/store/handle/item/13049.
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GRANCAGNOLO, SERGIO. "HADRONIC B DECAYS TO DOUBLE CHARM FINAL STATES." Doctoral thesis, Università degli studi di Trieste, 2005. http://thesis2.sba.units.it/store/handle/item/13050.
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Lage, Arianna Drumond. "Avaliação do Charm Cow Side II Test e Charm Blue Yellow II Test para a detecção de resíduos de antimicrobianos em leite." Universidade Federal de Minas Gerais, 2010. http://hdl.handle.net/1843/BUOS-8UCR7T.
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The milk supply chain is an important stage in Brazilian agribusiness. Therefore, it is necessary to have strict quality control at all stages of production, including the use of antimicrobials in animals, which may generate residues in milk, causing damages to producer, industries andconsumer health. Two kits based on microbial inhibition (Charm® Cow Side II Test and Charm® Blue Yellow II Test) for detection of antimicrobial residues in milk in different concentrations were evaluated. The ability of both to detect the tetracycline group in a lower concentration of that considered by Brazilian law was also evaluated. Milk samples wereinoculated with standard solutions of 23 different antimicrobial agents and metabolites with a solution of one of antimicrobials (ceftiofur) in two different concentrations: the lower limit of detection stated by the manufacturer (Level 1) and the maximum residue limit (MRL) (Level 2)established by the legislation. Both kits were effective in detecting most of antimicrobials tested in two concentrations, including metabolites of ceftiofur. It is necessary to review information from the manufacturer of the kit Charm® Cow Side II Test for the detection of residues of oxacillin, penicillin G, spiramycin, and sulfonamides and Charm® Blue Yellow II Test on the detection of erythromycin, cloxacillin, sulfadiazine, tylosin, and penicillin G in milk. Both kits detected residues of tetracyclines given the MRLs required by the Brazilian law and can be safely used for monitoring these drugs in milk. Keywords: milk, antimicrobials, residues, microbial inhibition<br>A cadeia produtiva do leite representa um importante segmento no agronegócio brasileiro. Por isso, é necessário que haja rigoroso controle de qualidade em todas as etapas de produção, incluindo o uso de antimicrobianos nos animais, que podem gerar resíduos no leite, causando prejuízos ao produtor, à indústria e à saúde do consumidor. Foram avaliados dois kits de inibição microbiana (Charm® Cow Side II Test e Charm® Blue Yellow II Test) para a detecção de resíduos de antimicrobianos em diferentes concentrações no leite. Avaliou-se também a capacidade de ambos em detectar o grupo das tetraciclinas em uma concentração menor daquela considerada na legislação brasileira. Amostras de leite foram inoculadas com soluções-padrãode 23 diferentes antimicrobianos e uma solução com metabólitos de um dos antimicrobianos (ceftiofur), em duas diferentes concentrações: o limite mínimo de detecção declarado pelo fabricante (Nível 1) e o limite máximo de resíduos (LMR) (Nível 2) estabelecido pela legislação. Ambos os kits foram eficientes na detecção da maioria dos antimicrobianos testados nas duas concentrações, inclusive de metabólitos de ceftiofur. É necessário rever a informaçãodo fabricante do kit Charm® Cow Side II Test quanto à detecção dos resíduos de oxacilina, penicilina G, das sulfonamidas e espiramicina e do kit Charm® Blue Yellow II Test quanto à detecção de eritromicina, cloxacilina, sulfadiazina, tilosina e penicilina G no leite. Os dois kitsdetectaram resíduos de tetraciclinas atendendo o LMR previsto na legislação brasileira e podem ser utilizados com segurança para o monitoramento destes resíduos no leite.
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Gioventù, Alessandra. "Test of lepton flavour universality with charm semileptonic decays." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2018. http://amslaurea.unibo.it/15749/.
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L'universalità leptonica è una delle simmetrie del Modello Standard (SM). Essa prevede che l'accoppiamento tra i bosoni di gauge e i leptoni delle tre famiglie sia uguale. I recenti risultati sperimentali sulle transizioni b->clnu , in particolare gli osservabili R(D) e R(D*) mostrano una differenza significativa dai valori previsti dal SM, aprendo le porte alla ricerca di nuova fisica anche nei decadimenti di mesoni charmed, che a livello di quark corrispondo alla transizione c->slnu, dove l può essere un muone o un elettrone. I test dello SM sono studiati attraverso la misura del rapporto R(mu/e), definito come R(mu/e)=(dΓ(μ)/dq2)/(dΓ(e)/dq2).
In questa tesi è stato realizzato uno studio preliminare che permette la misura di R(mu/e) attraverso la catena di decadimento D*^+ -> (D^0 → K^−l^+nu)pi^+, utilizzando i dati raccolti da LHCb durante il Run-2. Al fine di ottenere le informazioni complete sui prodotti del decadimento D^0 → K^−l^+nu, inclusa la stima del momento del neutrino, è stato implementato un algoritmo di global fit (GF). Inoltre, è stata studiata la contaminazione dello spettro di massa invariante del D^{*+}, dovuta a diversi canali di fondo. Per estrarre il numero di eventi di segnale, è stato fatto un fit di chi-quadro sulla massa invariante del D^{*+}, considerando soltanto il fondo combinatorio su un campione di dati, filtrato con dei tagli di PID, utili a ridurre altri fondi.
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Kusunoki, Masaoki. "Charm meson molecules and the X(3872)." Connect to this title online, 2005. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1122570013.
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Thesis (Ph. D.)--Ohio State University, 2005.<br>Title from first page of PDF file. Document formatted into pages; contains xiii, 131 p.; also includes graphics. Includes bibliographical references (p. 128-131). Available online via OhioLINK's ETD Center
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Kämpfer, Burkhard, and O. P. Pavlenko. "Probing early parton kinetics by photons, dileptons and charm." Forschungszentrum Dresden, 2010. http://nbn-resolving.de/urn:nbn:de:bsz:d120-qucosa-32669.
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Klein, Christoph [Verfasser]. "Berechnung hadronischer Übergangsamplituden in der Charm-Physik / Christoph Klein." Siegen : Universitätsbibliothek der Universität Siegen, 2011. http://d-nb.info/1017706379/34.
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Smith, Mark. "Measurements of indirect CP violation in charm at LHCb." Thesis, University of Manchester, 2016. https://www.research.manchester.ac.uk/portal/en/theses/measurements-of-indirect-cp-violation-in-charm-at-lhcb(aaeb5435-6310-46fa-81b1-6e45fa1af1c0).html.
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This thesis describes two pieces of work. The first is a study of the resolution of the LHCb vertex locator throughout Run 1. The second comprises analyses to measure the charm mixing and CP violation observables A_{Gamma} and y_{CP}.An estimate of the resolution of the LHCb vertex locator is required for use in the track fits. A method to measure the resolution with collision data has been developed and tested. The performance of the sub-detector throughout Run 1 of the LHC has been assessed. A significant degrading of the resolution has been seen. The effects of this on the track reconstruction has been examined with little change in the measured quantities being observed. The measurement of indirect CP violation in neutral D meson transitions has been measured through the observables A_{Gamma} and y_{CP}, using 1fb^{-1} of pp collisions with a centre of mass energy 7TeV, collected by the LHCb detector in 2011.A_{Gamma} describes the CP asymmetry of the lifetime of the D^0 decaying to a CP eigenstate (KK or pipi). The analysis documented here yields A_{Gamma} = (-0.17+-0.54)x10^{-3} when the measurements are combined. This is the world's best measurement and represented a factor of four improvement over the previous best result. The observable y_{CP} compares the effective lifetimes of the Cabibbo favoured decay D^0→Kpi and the transition to a CP eigenstate (KK or pipi). The unblinded result obtained in this document, averaged over both final states is y_{CP} = (5.61+-1.56)x10^{-3}. This result is commensurate with the world average central value within 1.25 standard deviations and has significance of 3.6 standard deviations relative to zero.
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Watson, Alan Trevor. "Electroweak effects in charm production in e⁺e⁻ annihilations." Thesis, Imperial College London, 1989. http://hdl.handle.net/10044/1/47702.
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Koolman, Erin Leigh. "The feminine character: the balance between strength and charm." Kansas State University, 2015. http://hdl.handle.net/2097/18992.
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Master of Music<br>School of Music, Theatre, and Dance<br>Patricia Thompson<br>This Master’s Report is in the form of extended program notes on works performed on a graduate recital for a mezzo-soprano. The notes include biographical information, and a literary and historical exploration of the piece selected, to discuss the overall theme of the feminine character as she appears in contrasting works. Translations of the texts are included in the body of the text.
The pieces discussed are Debussy’s Trois Chansons de Bilitis, Rossini’s “Cruda Sorte!...Già so per practica” from L’Italiana in Algeri, selections from Wolf’s Spaniches Liederbuch, Massenet’s “Va! Laisse couler mes larmes” from Werther, Lori Laitman’s Daughters, Handel’s “In gentle murmurs will I mourn” from Jephtha, and Granados’s La maja dolorosa No. 1, 2, and 3.
The graduate recital was given in partial fulfillment of the requirements for the Master of Music degree in vocal performance on March 29th, 2015 performed in All Faiths Chapel at Kansas State University. It featured the piano talents of Amanda Arrington, with the aid of Jillian Emerson on cello, Janice McGregor on violin, and Christopher Gugel on flute.
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Aronson, James. "Desert Plants of Use and Charm from Northern Chile." University of Arizona (Tucson, AZ), 1990. http://hdl.handle.net/10150/609119.
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Following a brief introduction to the geography, geomorphology, and climatic conditions of the arid northern regions of Chile, 20 taxa of plants are described in terms of their botany, ecology, distribution, and current and past uses. Emphasis is placed on perennial legumes, some of which are being used in a new research and development project in Chile. Discussion is also made of possible pre-Colombian plant exchanges between northern Chile and the region east of the Andes.
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Kämpfer, Burkhard, and O. P. Pavlenko. "Probing early parton kinetics by photons, dileptons and charm." Forschungszentrum Rossendorf, 1993. https://hzdr.qucosa.de/id/qucosa%3A22093.
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Aronson, James A., and Henry Thompson. "Desert Plants of Use and Charm from Southwestern Africa." University of Arizona (Tucson, AZ), 1987. http://hdl.handle.net/10150/554233.
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In September, 1986 a botanical survey was undertaken of South West Africa/Namibia (SWAIN) and adjacent arid parts of the Republic of South Africa (RSA). Primary emphasis was placed on the arid and semiarid regions with under 250 mm mean annual rainfall, in which both the summer-and winter-rainfall areas were visited. Observations were made on wild plants with known or potential value as new fruit or nut, vegetable, medicinal, or forage and fodder crops. Wild relatives of conventional crops for breeding programs were identified as well as several useful halophytes. New trees for agroforestry systems and new desert landscaping subjects were spotted, and last but not least, many desert plants of note were found for inclusion in living collections for purposes of botanical study and rapture.
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Lazzari, Federico. "Improving charm CPV measurements with real-time data reconstruction." Doctoral thesis, Università di Siena, 2022. http://hdl.handle.net/11365/1210360.
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The violation of CP asymmetry in charm decays is a small effect, and has only recently been experimentally established in a single decay mode. This thesis describes an effort towards expanding the experimental knowledge in this field, following two parallel directions of work. The first is the development of a novel analysis method for extracting CP asymmetries in 3-body decays, that is a middle ground between a full Dalitz analysis and a counting experiment. This new method allows the extraction of precision CP parameters from individual resonances with the same statistical resolution of a Dalitz analysis but with an improved control of systematics, and is suitable for large samples. This is used to analyze a promising decay mode for a second CPV observation, D^0 to KS K^-+ pi^+- , based on the largest currently available sample of those decays, collected by LHCb in Run 2.
The second line of work is the development of custom real-time tracking processor, aimed at maintaining a high trigger efficiency for charm decays also in the high-luminosity environment of future LHCb runs, allowing further improvements in the precision of charm CPV measurements. This system is based on a computing architecture called ``Artificial Retina'', implemented in FPGAs, that has the potential of reconstructing full events at the crossing rate of the LHC (averaging 30 MHz). As a result of the work performed in this thesis, all the core parts of the system are now designed and tested, and a realistic demonstrator based on those parts is being built. The demonstrator will operate in parasitic mode during physics data taking at LHCb to reconstruct tracks in a portion of the detector at the full speed of 30 MHz,
The first layer of this system, performing hit finding in the VELO vertex detector, has already surpassed the demonstration stage and has been adopted by LHCb for actual physics data taking already in Run 3, providing improved DAQ throughput and data compression.
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Kochebina, Olga. "Study of Rare Charm Decays with the LHCb Detector at CERN." Thesis, Paris 11, 2014. http://www.theses.fr/2014PA112208/document.
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Les désintégrations charmées rares interviennent principalement via des courants neutres changeant la saveur (FCNC). Le Modèle Standard (SM) n'autorise les courants qu'au niveau des boucles. Dans les désintégrations du charme, les FCNC sont sujets à une très efficace suppression de GIM. Des processus très rares sont donc à considérer. Ils sont d'excellents outils pour la recherche Nouvelle Physique (NP) au-delà du SM. Les particules de NP pourraient devenir détectables en écartant des observables telles que des rapports de branchement et des asymétries CP et angulaires prévisions de le SM. Le sujet principal de cette thèse est la mesure du rapport de branchement D0->K-π+ρ/ω(->µ+µ-). Il sera précieux en particulier en tant que mode de normalisation lors de l'étude de toutes les désintégrations D0 -> h-h’+ µ+µ- : D0 -> K-π+µ+µ-, D0 -> π+π-µ+µ-, D0 -> K+K-µ+µ- et D0 -> K+π-µ+µ-. En utilisant 2/fb de données collectées par LHCb en 2012, nous mesurons: B(D0 -> K-π+ ρ/ω (->µ+µ-)) = (4.37± 0.12(stat.) ±0.53(syst.)) ×10^-6. C'est la toute première mesure de ce mode. Nous avons également étudié la sensibilité qu'attendra LHCb dans les modes D0 -> h-h’+ µ+µ- pour la mesure de rapport des branchements totaux et partiels, et pour celle d'asymétries, avec les échantillons de données qui seront collectés d'ici 10 ans. Par ailleurs, nous avons déterminé les incertitudes systématiques touchant les recherches de désintégrations à trois corps, D+(s) -> π+µ+µ- et D+(s) -> π-µ+µ+, effectués par LHCb dans les données recueillies en 2011 (1/fb). Enfin, les tests effectués sue les prototypes des cartes d'électronique embarquée qui assureront la lecture des calorimètres de l'expérience le LHCb mise à jour sont présenté dans cette thèse<br>Rare charm decays proceed mostly through the c -> u Flavor Changing Neutral Current (FCNC), which is possible only at loop level in the Standard Model (SM). In charmed decays, FCNCs are subject to a very efficient GIM suppression, leading to very rare processes. Consequently, rare charm decays are good tools to probe to New Physics (NP) beyond the SM. NP particles could become detectable by causing observables such as branching ratios and CP or angular asymmetries to deviate from the SM predictions. The main subject of this thesis is the measurement of the branching ratio of the D0 -> K-π+ ρ/ω (->µ+µ-) mode. It will be precious in the future, in particular as a normalization mode in the study of all: D0 -> h-h’+ µ+µ- decays D0 -> K-π+µ+µ-, D0 -> π+π-µ+µ-, D0 -> K+K-µ+µ- and D0 -> K+π-µ+µ-. Using 2/fb of 2012 LHCb data we find: B(D0 -> K-π+ ρ/ω (->µ+µ-)) = (4.37± 0.12(stat.) ±0.53(syst.)) ×10^-6. This is the first measurement of this mode. We also determined sensitivities to total and partial branching fractions and asymmetries in D0 -> h-h’+ µ+µ- decays with future LHCb datasets. In addition, the systematic uncertainties affecting the searches for the 3-body decays, D+(s) -> π+µ+µ- and D+(s) -> π-µ+µ+, carried out by LHCb based on the data collected in 2011 (1/fb). Finally, the results of the tests of front-end electronic board for the Upgrade of LHCb are presented
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Andrén, Gustav, and Sara Pettersson. "Den serviceanställdes användande av humor, charm och flirt i kundmötet." Thesis, Karlstad University, Faculty of Economic Sciences, Communication and IT, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-3320.
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<p><strong><p>Abstract</p><p> </p></strong>This essay is written to answer the questions of why, how and against who employees in the service sector use humour, charm and flirt in the interaction with their customers. The service management research is quite extensive, but despite this the research partly misses studies around why employees tend to act in certain ways while interacting with their customers. To understand the reasons of why they act in these particular ways, we need to know which factors that can be crucial when it comes to the employees’ behaviour in these situations. By knowing the underlying reasons of using a special way to communicate with customers, it is much easier to achieve a clearer overview of the subject. That is why we also have studied if the employees tend to act different the moment they start the daily work, by taking on a mask or play a role. Of course many factors can play a ruling role in this quite wide concept, and that is why we have delimited the study to contain what we believe is the most important and revealing research within the service management discourse.</p><p>To get to this understanding we formulated some questions to answer. These questions are the following. </p><p>Why does service employees use humour, charm and flirt in the customer interaction?</p><p>In which ways does the use of humour, charm and flirt show?</p><p>Against whom does service employees use humour, charm and flirt?</p><p>Is there a connection between the concepts humour, charm and flirt?</p><p>By interviewing employees within the service sector we came to the conclusion that they use humour, charm and flirt to create a pleasant atmosphere for the customer. The employees also mentioned that it is more fun to work in a positive atmosphere. The use of humour, charm and flirt was mostly described as something that was adapted to every single customer. That means that the use humour, charm and flirt could imply several different things as for example joking, being rude in a friendly way and it could sometimes even mean verbally flirting, but in a friendly way, with regulars. The employees’ use of humour, charm or flirt was explained as something that was applied on many customer, depending on the judgement that was made by the employee based on what signals the customer sends out. Finally, by exploring the concepts, we found that there is an explicit connection between them. You are able to see a quite clear connection between humour and charm as well as between charm and flirt, since charm tended to be an extension of both these concepts. Humour and flirt where also connected since for example one employee described flirt as something that was only used with regulars. The conclusion of this is that employees in these matters only flirt with people they know and with people they therefore can assume do not take it the wrong way.</p><br><p><strong><p>Sammanfattning</p></strong></p><p>Denna uppsats är menad att besvara frågeställningarna varför, hur och mot vilka serviceanställda använder sig av humor, charm och flirt i kundmötet. Service managementforskningen är oerhört omfattande, trots detta saknas det delvis forskning kring anledningarna till serviceanställdas beteende gentemot sina kunder. För att förstå dessa olika typer av agerande behöver vi känna till de faktorer som kan vara avgörande i dessa situationer. Genom att känna till de bakomliggande skälen till ett visst förhållningssätt gentemot kunden, är det också lättare att uppnå en vidare förståelse inom ämnet. Det är bland annat därför vi också har studerat om de anställda, när de arbetar, tenderar att agera på ett annat sätt än de till vardags beter sig genom att exempelvis ikläda sig en roll eller "ta på sig en mask". Självklart är de faktorer som kan vara avgörande för resultatet i detta vida begrepp många, och därför har vi avgränsat oss till att endast ta upp sådan forskning som vi tycker är relevant, och för arbetet mest givande, inom service managementdiskursen.</p><p>För att få en klarare bild av vad undersökningen i själva verket ska klargöra utformade vi fyra frågeställningar. Frågorna är följande.</p><p>Varför använder sig anställda av humor, charm och flirt i kundmötet?</p><p>Vilka konkreta uttryck tar sig användandet av humor, charm och flirt?</p><p>Mot vilka personer används humor, charm och flirt?</p><p>Finns det någon koppling mellan humor, charm och flirt?</p><p>Genom att genomföra intervjuer med anställda inom servicesektorn kom vi fram till att de använder humor, charm och flirt för att skapa en trivsam atmosfär för kunden. De anställda nämnde att det också är roligare att arbeta i en miljö präglad av positivitet. Användandet av humor, charm och flirt blev mestadels beskrivet som något den anställde anpassade efter de olika kundernas enskilda behov. Detta innebär att tillämpandet kunde innefatta flera olika typer av beteende såsom skämtsamhet, oförskämdhet på ett vänskapligt sätt. Det kunde i vissa fall även innebära verbalt flirtande, också på ett vänskapligt sätt, då framförallt med stamgästerna. Användandet av humor, charm och flirt förklaras av intervjupersonerna som något som är applicerbart på många kunder, beroende på den bedömning av varje kund som den anställde utförde genom att tolka de olika signaler kunden sänder ut. Slutligen, genom att utforska de olika begreppen, kom vi fram till att det finns ett klart samband mellan dem. Mellan humor och charm samt mellan charm och flirt går det att se en tydlig koppling, då charm tenderar att fungera som någon sorts mellanting mellan de båda "extremerna" humor och flirt. Humor och flirt har också en liten koppling. En anställd säger till exempel att hon flirtar med sina stamgäster. Av detta drar vi slutsatsen att denna typ av flirt enbart uppstår då den anställde är bekant med gästen, varpå själva flirten blir mer humoristisk och vänskaplig. Den anställde kan därmed i högre grad anta att gästen inte tar flirten på fel sätt.</p>
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Kose, Umut. "Antineutrino Charm Production And Pentaquark Search In The Chorus Experiment." Phd thesis, METU, 2006. http://etd.lib.metu.edu.tr/upload/12607823/index.pdf.
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During the years between 1994 and 1997, the emulsion target of the CHORUS experiment
was exposed to the wide band neutrino beam of the CERN SPS of 27 GeV average
energy collecting about 106 neutrino interactions. A measurement of induced charm
production and search for anticharmed pentaquark (0
c ) have been performed by using
the presence of a 6% component in the beam. By requiring a positive muon charge
as determined by the CHORUS muon spectrometer, 46 -induced charm events were
observed with an estimated background of 5:20:4 events. At an average antineutrino
energy of 18 GeV in the neutrino beam, the charm production rate induced by is
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Riebel-Charity, Krisztina C. "Developing a library for proofs of data possession in Charm." Monterey, California: Naval Postgraduate School, 2013. http://hdl.handle.net/10945/34728.
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Approved for public release; distribution is unlimited<br>Provable Data Possession (PDP) is a cryptographic tool for auditing big data on a storage server or in the cloud. The goal of PDP is to efficiently verify that the server is storing the data. PDP provides probabilistic guarantees that the server is storing the information, and it will be available when needed, without accessing the entire file. In this work, we have developed a PDP module for the Charm cryptographic framework. We wrote an application programmer interface (API) for generic PDP schemes. We implemented the simple MAC-PDP scheme with efficient subroutines for sub-linear sampling. We hope that this work will encourage further study in the rapid prototyping and evaluation of new PDP schemes in the Charm framework.
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Godfrey, I. M. "Charm photoproduction at threshold and 20 GeV charmed particle delay." Thesis, Imperial College London, 1987. http://hdl.handle.net/10044/1/38332.
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Witchey, Nicholas James. "Search for flavor changing neutral current decays of charm mesons /." The Ohio State University, 1996. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487935125882463.
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Adler, Mark Wise Mark B. "The persistence of charm in the relentless decay of beauty /." Diss., Pasadena, Calif. : California Institute of Technology, 1990. http://resolver.caltech.edu/CaltechETD:etd-09162005-162439.
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Hufnagel, Dirk. "Search for the Cabibbo-Supressed D+ Meson Decays D+ → π+π0 and D+ → K+π0". The Ohio State University, 2005. http://rave.ohiolink.edu/etdc/view?acc_num=osu1125681975.
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Rovinelli, Giovanni. "Tecniche statistiche per l'analisi dati della fisica del charm ad LHCb." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2018. http://amslaurea.unibo.it/16783/.
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Il testo riporta un’analisi di metodi statistici nella determinazione di parametri
fisici mediante l’adattamento ai dati di una curva teorica ad una distribuzione di massa invariante del
mesone D0 . Questo studio ha lo scopo di determinare quale metodo statistico è più opportuno impiegare
con un’alta statistica di dati, tipica dell’esperimento LHCb che ad oggi e nei prossimi anni dovrà analizzare
diversi milioni di dati. In questo studio è stato fatto un confronto tra il metodo di maximum likelihood e il metodo di χ 2 , sia analizzando una distribuzione binnata di massa invariante sia una non binnata.
Le distribuzioni di massa invarianti sono state generate con un metodo Monte Carlo e sono state descritte
con una funzione Gaussiana per simulare il segnale e con una funzione esponenziale per descrivere il
fondo. Sono stati simulati e analizzati per ogni configurazione 50 × 10 6 eventi con un rapporto segnale su
fondo pari a 1. Nel caso binnato, diverse configurazioni di binning sono state analizzate, in particolare
utilizzando da 5 a 1000 bin, nell’intervallo di massa invariante 1810/1920 MeV/C 2 . In conclusione si è
osservato che grazie ai metodi di ML e χ 2 nel caso di analisi di distribuzioni binnate i risultati sono
uguali per 1000,500,300, 200, 100, 50 bin e risultano essere uguali anche al caso in cui la distriuzione non
è binnata. Nel caso di 10 e 5 bin si sono osservate alcune differenze tra i due metodi nella determinazione
dei parametri di interesse, ma anche rispetto ai valori generati. Il tempo di esecuzione di un
algoritmo di minimizzazione nel caso di una distribuzione binnata è di pochi secondi, mente nel caso di
una distribuzione non binnata è di circa 8.5 × 10 3 secondi. Pertanto è possibile concludere che una tipica
analisi su un campione di dati di 50 × 10 6 di eventi di mesoni D0 può essere fatta sia con il metodo di ML
sia con il metodo di χ 2 con una distribuzione di massa invariante binnata, con una configurazione non inferione di 50 bin.
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Hebbel, Kirstin. "Measurement of charm production in deep inelastic ep scattering at HERA." [S.l. : s.n.], 2000. http://www.sub.uni-hamburg.de/disse/198/thesis.pdf.
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Schaller, Sven. "Leistungsmerkmale des HERA-B-Vertexdetektors und Suche nach semileptonischen Charm-Zerfällen." [S.l. : s.n.], 2001. http://deposit.ddb.de/cgi-bin/dokserv?idn=963204025.
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Bellerive, Alain. "Investigation of semileptonic B meson decays to P-wave charm mesons." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape11/PQDD_0001/NQ44361.pdf.
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Wang, Meng. "Charm production in charged current deep inelastic ep scattering at HERA." Bonn : Physikalisches Inst, 2006. http://deposit.d-nb.de/cgi-bin/dokserv?idn=979511836.
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Aghuzumtsyan, Gayane. "Charm photoproduction using electron taggers with the ZEUS detector at HERA." Bonn : Physikalisches Inst, 2006. http://deposit.d-nb.de/cgi-bin/dokserv?idn=982296622.
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