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Relevant bibliographies by topics / FCNC – Flavour Changing Neutral currents

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Academic literature on the topic 'FCNC – Flavour Changing Neutral currents'

Author: Grafiati

Published: 4 September 2021

Last updated: 11 February 2022

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Journal articles on the topic "FCNC – Flavour Changing Neutral currents"

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Kozachuk, Anastasiia, Dmitri Melikhov та Nikolai Nikitin. "Long-distance QCD effects in FCNC B → γl+l- decays". EPJ Web of Conferences 192 (2018): 00031. http://dx.doi.org/10.1051/epjconf/201819200031.

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This presentation reviews the main results of our recent work [1] on rare radiative leptonic decays Bd,s → γμ+μ- and Bd,s → γe+e- induced by flavour-changing neutral currents (FCNC) in the Standard Model.

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Hesari, Hoda, Hamzeh Khanpour, Morteza Khatiri Yanehsari, and Mojtaba Mohammadi Najafabadi. "Probing the Top Quark Flavour-Changing Neutral Current at a Future Electron-Positron Collider." Advances in High Energy Physics 2014 (2014): 1–9. http://dx.doi.org/10.1155/2014/476490.

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We present a study to examine the sensitivity of a futuree-e+collider to the anomalous top flavour-changing neutral current (FCNC) to the gluon. To separate signal from background a multivariate analysis is performed on top quark pair and background events, where one top quark is considered to follow the dominant standard model (SM) decay,t→Wb, and the other top decays through FCNC,t→qg, whereqis au- or ac-quark. The analysis of fully hadronic FCNC decay of thett-pair is also presented. The 95% confidence level limits on the top quark anomalous couplings are obtained for different values of th

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Alton, A., T. Adams, S. Avvakumov та ін. "SEARCH FOR LIGHT-TO-HEAVY QUARK FLAVOR CHANGING NEUTRAL CURRENTS IN νμN AND ${\bar \nu}_\mu N$ SCATTERING". International Journal of Modern Physics A 16, supp01b (2001): 489–91. http://dx.doi.org/10.1142/s0217751x01007297.

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We report on a search for flavor-changing neutral-currents (FCNC) in the production of heavy quarks in deep inelastic νμN and [Formula: see text] scattering by the NuTeV experiment at the Fermilab Tevatron. This measurement, made possible by the high-purity NuTeV sign-selected beams, probes for FCNC in heavy flavors at the quark level and is uniquely sensitive to neutrino couplings of potential FCNC mediators. All searches are consistent with zero, and limits on the effective mixing strengths |Vus|2, |Vdb|2, and |Vsb|2 are obtained.

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Melikhov, Dmitri. "Charming loops in exclusive rare FCNC B-decays." EPJ Web of Conferences 222 (2019): 01007. http://dx.doi.org/10.1051/epjconf/201922201007.

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Rare B-decays induced by flavour-changing neutral currents (FCNC) is one of the promising candidates for probing physics beyond the Standard model. However, for identifying potential new physics from the data, reliable control over QCD contributions is necessary. We focus on one of such QCD contributions – the charming loops – that potentially can lead to difficulties in disentangling new physics effects from the observable and discuss the possibility to gain control over theoretical predictions for charming loops.

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Papoulias, D. K., and T. S. Kosmas. "Studying background processes of the exotic neutrino-nucleus reactions." HNPS Proceedings 21 (March 8, 2019): 11. http://dx.doi.org/10.12681/hnps.1998.

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The background processes of the flavour changing neutral current (FCNC) processes, predicted by various new-physics models to occur in the presence of nuclei, are examined by computing the relevant nuclear matrix elements within the context of the quasi-particle RPA using realistic strong two-body forces. Our main goal is to explore the role of the non-standard interactions (NSI) in the leptonic sector and specifically: (i) in lepton flavour violating (LFV) processes involving neutrinos νl and ν ̃l, l = e, μ, τ and (ii) in charged lepton flavour violating (cLFV) processes involving the charged

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Turk Cakir, I., A. Yilmaz, H. Denizli, A. Senol, H. Karadeniz та O. Cakir. "Probing the Anomalous FCNC tqγ Couplings at Large Hadron Electron Collider". Advances in High Energy Physics 2017 (14 вересня 2017): 1–8. http://dx.doi.org/10.1155/2017/1572053.

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We investigate the anomalous flavour changing neutral current (FCNC) interactions of top quark through the process e-p→e-W±q+X. We calculate the signal and background cross sections in electron-proton collisions at Large Hadron electron Collider (LHeC) with a 7 TeV proton beam from the LHC and a new 60 GeV electron beam from energy recovery linac (ERL). We study the relevant background processes including one electron and three jets in the final state. The distributions of the invariant mass of two jets and an additional jet tagged as b-jet are used to account for signal and background events

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KANEKO, SATORU, HIDEYUKI SAWANAKA, TAKAYA SHINGAI, MORIMITSU TANIMOTO, and KOICHI YOSHIOKA. "FLAVOR SYMMETRY AND VACUUM ALIGNED MASS TEXTURES." International Journal of Modern Physics E 16, no. 05 (2007): 1427–36. http://dx.doi.org/10.1142/s0218301307006782.

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A texture-zeros is an approach to reduce the number of free parameters in Yukawa couplings and it is one of the most attractive ones. In our paper, we discuss the origin of zero-structure in texture-zeros by S3 flavor symmetry approach. Some of electroweak doublet Higgs fields have vanishing vacuum expectation value (VEV) which leads to vanishing elements in quark and lepton mass matrices. Then, the structure of supersymmetric scalar potential is analyzed and Higgs fields have non-trivial S3 charges. As a prediction of our paper, a lower bound of a MNS matrix element, Ue3 ≥ 0.04, is obtained.

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ANDRIANOV, A. A., V. A. ANDRIANOV, V. L. YUDICHEV, and R. RODENBERG. "COMPOSITE TWO-HIGGS MODELS (GENERAL PART)." International Journal of Modern Physics A 14, no. 03 (1999): 323–58. http://dx.doi.org/10.1142/s0217751x99000178.

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Quark models with four-fermion interaction including derivatives of fields in the strong coupling regime are used to implement composite-Higgs extensions of the Standard Model. In this approach the dynamical breaking of chiral symmetry occurs in two (or more) channels (near polycritical values for coupling constants), giving rise to two (or more) composite Higgs doublets. Two types of models are built for which Flavor Changing Neutral Currents (FCNC) are naturally suppressed. In the first Model I the second Higgs doublet is regarded as a radial excitation of the first one. In the second Model

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NIERSTE, ULRICH. "QUARK MIXING AND CP VIOLATION — THE CKM MATRIX." International Journal of Modern Physics A 21, no. 08n09 (2006): 1724–37. http://dx.doi.org/10.1142/s0217751x0603271x.

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I summarize the theoretical progress in the determination of the CKM elements since Lepton-Photon 2003 and present the status of the elements and parameters of the Cabibbo-Kobayashi-Maskawa (CKM) matrix. One finds |Vus| = 0.2227 ± 0.0017 from K and τ decays and |Vcb| = (41.6 ± 0.5) · 10-3 from inclusive semileptonic B decays. The unitarity triangle can now be determined from tree-level quantities alone and the result agrees well with the global fit including flavour-changing neutral current (FCNC) processes, which are sensitive to new physics. From the global fit one finds the three CKM angles

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FROGGATT, C. D., R. NEVZOROV, H. B. NIELSEN, and D. THOMPSON. "ON THE ORIGIN OF APPROXIMATE CUSTODIAL SYMMETRY IN THE TWO-HIGGS DOUBLET MODEL." International Journal of Modern Physics A 24, no. 30 (2009): 5587–637. http://dx.doi.org/10.1142/s0217751x09047442.

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We argue that the consistent implementation of the multiple point principle (MPP) in the general nonsupersymmetric two-Higgs doublet model (2HDM) can lead to a set of approximate global custodial symmetries that ensure CP conservation in the Higgs sector and the absence of flavor changing neutral currents (FCNC) in the considered model. In particular, the existence of a large set of degenerate vacua at some high energy scale Λ caused by the MPP can result in approximate U(1) and Z2 symmetries that suppress FCNC and CP-violating interactions in the 2HDM. We explore the renormalization group (RG

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Dissertations / Theses on the topic "FCNC – Flavour Changing Neutral currents"

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Friedrich, Conrad. "Search for single top-quark production via flavour-changing neutral currents in strong interactions using s = 8 TeV ATLAS data." Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät I, 2015. http://dx.doi.org/10.18452/17348.

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In dieser Dissertation werden Resultate einer Suche nach der Produktion von Einzel-Top-Quarks über flavour-verletzende neutrale Ströme (FCNCs) in starken Welchselwirkungen vorgestellt. Hierfür werden Daten aus Proton-Proton-Kollisionen am Large Hadron Collider bei einer Schwerpunktsenergie von 8TeV verwendet. Die Daten wurden mit dem ATLAS-Experiment im Jahr 2012 aufgenommen und entsprechen einer integrierten Luminosität von 14.1 fb−1. In der Analyse werden FCNC-Ereignisse selektiert, in denen ein leichtes Quark (u oder c) mit einem Gluon wechselwirkt, und ein einzelnes Top-Quark und potentiel

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Alpigiani, Cristiano. "Search for rare B decays into two muons with the ATLAS detector." Thesis, Queen Mary, University of London, 2015. http://qmro.qmul.ac.uk/xmlui/handle/123456789/8922.

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The impressive progress that elementary particle physics made in the second half of the last century led to the formulation of a comprehensive theory, known as the Standard Model (SM), which correctly describes all fundamental interactions in nature, except for the gravitational one. Indirect discoveries have always played an important role in high energy physics scenario and indirect research can be considered to all intents and purposes complementary to the direct one, since allows to test much higher energy scales than those the current colliders are able to reach. This is very important no

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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

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Quintana, Boris. "Search for radiative B decays to orbitally excited mesons at LHCb." Thesis, Université Clermont Auvergne‎ (2017-2020), 2019. http://www.theses.fr/2019CLFAC060.

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Cette thèse présente une étude des désintégrations radiatives des mésons B0 et Bs, produits lors des collisions de protons du Grand Collisionneur de Hadrons (LHC), au Laboratoire Européen de Physique des Particules (CERN),vers des états orbitallement excités. Elle s’inscrit dans le contexte de recherche indirecte de physique au-delà du Modèle Standard de la Physique des Particules. Les données récoltées par le détecteur LHCb pendant le Run 1(2011-2012) et le Run 2 (2015-2018) du LHC, correspondant à une luminosité intégrée de 8.7 fb−1, sont utilisées pour l’analyse. Une sélection optimisée des

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Alhroob, Muhammad [Verfasser]. "Search for Flavour Changing Neutral Currents in Single Top-Quark Production at √s = 7 TeV with the ATLAS Detector / Muhammad Alhroob." Bonn : Universitäts- und Landesbibliothek Bonn, 2013. http://d-nb.info/1044869984/34.

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Arslan, Ozan [Verfasser]. "Search for Flavour Changing Neutral Currents through Single Top-Quark Production at radix 8 TeV with the ATLAS Detector / Ozan Arslan." Bonn : Universitäts- und Landesbibliothek Bonn, 2017. http://d-nb.info/114974491X/34.

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Cotellucci, Alessandro. "Flavour constraints on sequestered supersymmetry breaking in string models." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2020. http://amslaurea.unibo.it/21709/.

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The Standard Model (SM) is the best theory which describes Nature at the fundamental level. Even if it provides very accurate predictions, the SM features some open problems. A promising extension of the SM is the Minimal Supersymmetric Standard Model (MSSM) provided by supersymmetry. The MSSM can provide solutions for some of the open problems of the SM but it can suffer from the flavour supersymmetric problem associated with the presence of large Flavour Changing Neutral Currents (FCNCs). The flavour supersymmetric problem is related to the mechanism which mediates supersymmetry breaking fr

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Friedrich, Conrad [Verfasser], Ulrich [Akademischer Betreuer] Husemann, Heiko [Akademischer Betreuer] Lacker, and Arno [Akademischer Betreuer] Straessner. "Search for single top-quark production via flavour-changing neutral currents in strong interactions using s = 8 TeV ATLAS data / Conrad Friedrich. Gutachter: Ulrich Husemann ; Heiko Lacker ; Arno Straessner." Berlin : Humboldt Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät I, 2015. http://d-nb.info/1078666466/34.

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Borsato, Martino. "Study of the BO to Kstar0 electron positron decay with the LHCb detector and development of a novel concept of PID detector : the Focusing DIRC." Sorbonne Paris Cité, 2015. https://theses.hal.science/tel-01456521.

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Les courants neutres changeant le saveur de type b —>sy sont interdites au niveau de l'arbre dans le Modèle Standard (MS) et ils se produisent au premier ordre à travers des diagrammes radiatives à boucle. Par conséquent, ils sont sensibles à la Nouvelle Physique (NP), qui peut contribuer soit au niveau de l'arbre ou de la boucle. En outre, la chiralité de l'interaction faible dans le MS implique que le photon émis a une polarisation gauche. Cependant, toute une classe de théories de NP ne partagent pas cette caractéristique du MS et pourraient se manifester sans ambiguïtés comme une contri

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Geßner, Gregor [Verfasser], Kevin [Akademischer Betreuer] Kröninger, and Wolfgang [Gutachter] Wagner. "Search for flavour-changing neutral currents in processes with a single top quark in association with a photon using a deep neural network at the ATLAS experiment at √s = 13TeV / Gregor Geßner ; Gutachter: Wolfgang Wagner ; Betreuer: Kevin Kröninger." Dortmund : Universitätsbibliothek Dortmund, 2019. http://d-nb.info/1203373015/34.

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Book chapters on the topic "FCNC – Flavour Changing Neutral currents"

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Barroso, A. "One-Loop Flavour-Changing Neutral Currents in the Standard Model." In NATO ASI Series. Springer US, 1990. http://dx.doi.org/10.1007/978-1-4684-9054-1_14.

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"Flavour–changing Neutral Currents." In Electroweak Interactions. CRC Press, 2015. http://dx.doi.org/10.1201/b19048-18.

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Conference papers on the topic "FCNC – Flavour Changing Neutral currents"

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Köhler, Nicolas Maximilian. "Searches for flavour violation and flavour changing neutral currents in top quark final states." In 40th International Conference on High Energy physics. Sissa Medialab, 2021. http://dx.doi.org/10.22323/1.390.0330.

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Moreno Llácer, María. "Studies of rare top quark processes: $tZq$, $tγq$, $t ̄tt ̄t$ and flavour changing neutral currents". У 7th Annual Conference on Large Hadron Collider Physics. Sissa Medialab, 2019. http://dx.doi.org/10.22323/1.350.0106.

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