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Journal articles on the topic 'Single lepton'

Author: Grafiati

Published: 4 June 2021

Last updated: 15 February 2022

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1

KUZMIN, KONSTANTIN S., VLADIMIR V. LYUBUSHKIN, and VADIM A. NAUMOV. "LEPTON POLARIZATION IN NEUTRINO–NUCLEON INTERACTIONS." Modern Physics Letters A 19, no. 38 (December 14, 2004): 2815–29. http://dx.doi.org/10.1142/s0217732304016172.

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We derive generic formulas for the polarization density matrix of leptons produced in νN and [Formula: see text] collisions and briefly consider some important particular cases. Next we employ the general formalism in order to include the final lepton mass and spin into the popular model by Rein and Sehgal for single pion neutrinoproduction.

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2

Roberts, Winston. "Partial-wave analysis of lepton-pair annihilation into two photons." Canadian Journal of Physics 64, no. 10 (October 1, 1986): 1359–64. http://dx.doi.org/10.1139/p86-241.

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The partial-wave (Jp) composition of the process ℓ+ℓ− → γγ is analyzed in lowest order quantum electrodynamics. The results for low-momentum leptons are as expected, the partial wave with Jp = 0− being dominant. At high energies, the partial wave with Jp = 2+ has the largest single partial cross section. At all energies, it is found that lepton pairs in the triplet state give rise exclusively to positive-parity final states, whereas pairs in the singlet state give rise to negative-parity final states.Some features of the differential cross section are also explained in terms of the spin state of the annihilating lepton pair. Possible implications for e+e− → γγ → hadrons and [Formula: see text] hadrons are briefly discussed.

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3

Peñuñuri, F., F. Larios, and Antonio O. Bouzas. "Single Top quark production at lepton colliders." Journal of Physics: Conference Series 378 (August 10, 2012): 012018. http://dx.doi.org/10.1088/1742-6596/378/1/012018.

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4

Giele, W. T., E. W. N. Glover, and David A. Kosower. "Single lepton production at large transverse momentum." Physics Letters B 309, no. 1-2 (July 1993): 205–9. http://dx.doi.org/10.1016/0370-2693(93)91528-u.

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5

SCHLEGEL, MARC. "ESTIMATING THE SIGN AND SIZE OF THE TRANSVERSE SINGLE TARGET-SPIN ASYMMETRY IN INCLUSIVE DIS." International Journal of Modern Physics: Conference Series 25 (January 2014): 1460012. http://dx.doi.org/10.1142/s201019451460012x.

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The single-spin asymmetry of unpolarized leptons scattering deep-inelastically off transversely polarized nucleons is discussed. This observable is generated by a two-photon exchange between lepton and nucleon. In a partonic description of the asymmetry the non-perturbative part is given in terms of multiparton correlations: quark-gluon correlation functions and quark-photon correlation functions. Using input from models and data fits for these twist-3 correlation functions, estimates for the single-spin asymmetries for a proton and a neutron are presented.

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6

SCHMITZ, NORBERT. "HADRON PRODUCTION IN HIGH ENERGY LEPTON-NUCLEON AND LEPTON-NUCLEUS COLLISIONS." International Journal of Modern Physics A 03, no. 09 (September 1988): 1997–2065. http://dx.doi.org/10.1142/s0217751x88000849.

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Recent experimental results on the production of hadrons in collisions of muons, neutrinos and antineutrinos with nucleons and nuclei at high energies are reviewed and discussed in the framework of the quark-parton model. Data are presented on the following topics: Multiplicities, fragmentation functions, transverse momenta and jet properties, azimuthal asymmetry, distribution of quantum numbers, production of strange and charmed particles, test of PCAC and shadowing, single meson production, and Bose-Einstein correlations.

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7

Coutinho, Y. A., J. A. Martins Simões, C. M. Porto, and P. P. Queiroz Filho. "Single heavy lepton production in hadron-hadron collisions." Physical Review D 57, no. 11 (June 1, 1998): 6975–80. http://dx.doi.org/10.1103/physrevd.57.6975.

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8

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 leptons l− or l+. As concrete nuclear system we have chosen the stopping target of μ− → e− conversion experiment, i.e. the 48Ti nucleus of the PRIME/PRISM experiment at J-PARC. This experiment has been designed to reduce the single event sensitivity down to 10−16–10−18 in searching for charged lepton mixing events. We also present, stringent constraints on the flavour violating parameters entering the NSI Lagrangians that have been obtained by taking advantage of our detailed nuclear structure calculations and exploiting the present limits or the sensitivity of the proposed exotic μ− → e− experiments.

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9

Almeida, F. M. L., Y. A. Coutinho, J. A. Martins Simões, and M. A. B. do Vale. "Single neutral heavy lepton production at electron–muon colliders." Physics Letters B 494, no. 3-4 (November 2000): 273–79. http://dx.doi.org/10.1016/s0370-2693(00)01195-3.

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10

Barger, V., J. Ohnemus, and R. J. N. Phillips. "Event shape criteria for single-lepton top-quark signals." Physical Review D 48, no. 9 (November 1, 1993): R3953—R3956. http://dx.doi.org/10.1103/physrevd.48.r3953.

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11

Almeida, F. M. L., J. H. Lopes, J. A. Martins Simões, P. P. Queiroz Filho, and A. J. Ramalho. "Single heavy lepton production in high energy electron-positron collisions." Physical Review D 51, no. 11 (June 1, 1995): 5990–95. http://dx.doi.org/10.1103/physrevd.51.5990.

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12

METZ, ANDREAS, DANIEL PITONYAK, ANDREAS SCHÄFER, MARC SCHLEGEL, WERNER VOGELSANG, and JIAN ZHOU. "WHAT CAUSES TRANSVERSE SINGLE-SPIN ASYMMETRIES IN LEPTON-NUCLEON AND IN NUCLEON-NUCLEON SCATTERING?" International Journal of Modern Physics: Conference Series 25 (January 2014): 1460011. http://dx.doi.org/10.1142/s2010194514600118.

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Transverse single-spin asymmetries are among the most intriguing observables in hadronic physics. Though such asymmetries were already measured for the first time about four decades ago, their origin is still under debate. Here we consider transverse single-spin asymmetries in semi-inclusive lepton-nucleon scattering, in nucleon-nucleon scattering, and in inclusive lepton-nucleon scattering. It is argued that the single-spin asymmetries for those three processes may be simultaneously described in perturbative QCD, where the re-scattering of the active partons plays a crucial role. A comparison of single-spin asymmetries in different reactions can also shed light on the universality of transverse momentum dependent parton correlation functions. In particular, we discuss what existing data tells us about the predicted process dependence of the Sivers function.

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13

Khiem, Phan Hong, and Tran Tri Dzung. "\(\mathcal{O}(\alpha^3)\) ISR Corrections to Single Higgs Productions at Future Lepton Colliders." Communications in Physics 29, no. 2 (May 14, 2019): 163. http://dx.doi.org/10.15625/0868-3166/29/2/13582.

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In this paper, we present \(\mathcal{O}(\alpha^3)\) QED corrections due to initial-state photon radiation (ISR) to processes \(e^{−} e^{+} \to f \bar{f} H\) with \(f = e, \mu_e, \nu_{\mu}, \nu_{\tau}\) at future lepton colliders. The impact of the ISR corrections on the total cross sections are studied. We find that the corrections vary from ∼ −30% to −10% in the range of center-of-mass energies from 200 GeV to 700 GeV. The ISR corrections to some realistic distributions of experimental interest for searching the properties of the Higgs boson are also evaluated and they are order of \(\sim −10\)% contributions at \(s = 250\) GeV. The corrections are massive contributions and they must be taken into account for matching high precision data at future lepton colliders.

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14

AKAMA, KEIICHI, and HIDEZUMI TERAZAWA. "UNIVERSAL PARAMETRIZATION FOR QUARK AND LEPTON SUBSTRUCTURE." Modern Physics Letters A 09, no. 37 (December 7, 1994): 3423–30. http://dx.doi.org/10.1142/s0217732394003257.

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A universal parametrization for possible quark and lepton substructure is advocated in terms of quark and lepton form factors. It is emphasized that the lower bounds on compositeness scale, Λc, to be determined experimentally depend strongly on their definitions in composite models. From the recent HERA data, it is estimated to be Λc>50 GeV , 0.4 TeV and 10 TeV, depending on the parametrizations with a single-pole form factor, a contact interaction and a logarithmic form factor, respectively.

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15

Cobal, M., H. Grassmann, and S. Leone. "On exploiting the single-lepton event structure for the top search." Il Nuovo Cimento A 107, no. 1 (January 1994): 75–83. http://dx.doi.org/10.1007/bf02813074.

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16

Canelli, Florencia. "Helicity of the W in Single-Lepton $t\bar{t}$ Events." International Journal of Modern Physics A 18, supp01 (February 2003): 304–19. http://dx.doi.org/10.1142/s0217751x03016689.

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We have developed a procedure to study the helicity of the W boson in [Formula: see text] events. Using events generated with the PYTHIA program at a top Mt = 175 GeV/c2, we employ a maximum likelihood method to extract the fraction of right-handed, longitudinal and left-handed W bosons in top decays. Assuming V–A coupling in the decay, we obtain a longitudinal fraction of 0.696±0.097 for 50 simulated experiments of 100 events in lepton+jets [Formula: see text] final states, a result that is consistent with the input fraction of 0.703.

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17

Mukhopadhyay, A., and B. F. L. Ward. "Interplay between IR-improved DGLAP-CS theory and the precision of an NLO ME matched parton shower MC in relation to LHCb data." Modern Physics Letters A 31, no. 11 (April 10, 2016): 1650063. http://dx.doi.org/10.1142/s0217732316500632.

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We use comparison with recent LHCb data on single [Formula: see text] production and decay to lepton pairs as a vehicle to study the current status of the application of our approach of exact amplitude-based resummation in quantum field theory to precision quantum chromodynamics (QCD) calculations, by realistic MC event generator methods, as needed for precision large hadron collider (LHC) physics. This represents an extension of the phase space of our previous studies based on comparison with CMS and ATLAS data, as the pseudo-rapidity range measured by the LHCb for leptons in the data we study is 2.0 [Formula: see text] 4.5 to be compared with [Formula: see text] 4.6(2.4) in our previous CMS(ATLAS) data comparison for the same processes. To be precise, for [Formula: see text] decays, the CMS data had [Formula: see text] 2.1 while, for [Formula: see text] decays, the CMS data had [Formula: see text] 2.1 for both leptons for the [Formula: see text][Formula: see text] spectrum and had one lepton with [Formula: see text] 2.5 and one with [Formula: see text] 4.6 for the [Formula: see text] rapidity spectrum. The analyses we present here with the LHCb data thus represent an important addition to our previous results, as it is essential that theoretical predictions be able to control all of the measured phase space at LHC. The level of agreement between the new theory and the data continues to be a reason for optimism.

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18

Chang, Ngee-Pong. "Endowing the Standard Model with a new r-symmetry." International Journal of Modern Physics A 29, no. 21 (August 20, 2014): 1444008. http://dx.doi.org/10.1142/s0217751x14440084.

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In the Standard Model, there is the single Higgs field, ϕ, which gives rise to constituent quark and lepton masses. The Yukawa coupling is a highly complex set of 3 × 3 matrices, resulting in many textures of quark and lepton masses. In this talk, we propose to transfer the complexity of the Yukawa coupling matrices to a family of Higgs fields, so that the Yukawa coupling itself becomes a simple interaction. In the context of an Enriched Standard Model, we introduce a new r-symmetry in the extended SU(2)L × U(1)Y × U(1)R model and show how a particularly simple scenario results in a near degeneracy of masses in the 126 GeV region, with a hierarchy of heavier masses suggested by the quark and lepton texture mass matrices.

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19

Liao, Jiajun, D. Marfatia, and K. Whisnant. "Partial Quark-Lepton Universality and Neutrino CP Violation." Advances in High Energy Physics 2015 (2015): 1–5. http://dx.doi.org/10.1155/2015/561910.

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We study a model with partial quark-lepton universality that can naturally arise in grand unified theories. We find that constraints on the model can be reduced to a single condition on the Dirac CP phaseδin the neutrino sector. Using our current knowledge of the CKM and PMNS mixing matrices, we predict-32.4°≤δ≤32.0°at2σ.

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20

Moosmann, Julian, and Ralf Hofmann. "Charged Lepton Spectra from Hot-Spot Evaporation." ISRN High Energy Physics 2012 (March 5, 2012): 1–12. http://dx.doi.org/10.5402/2012/509793.

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Spectra for the emission of charged leptons from evaporating hot-spots of preconfining phase in SU(2) Yang-Mills thermodynamics are computed. Specifically, we consider charged single and dileptons with their spectra being functions of energy and invariant mass, respectively. In the former case, our results relate to narrow and correlated electron and positron peaks measured in supercritical heavy-ion collisions performed at GSI in the 1980s. In the latter case, we point out how strongly the spectra depend on typical kinematic cuts (CDF analysis of Tevatron Run II data). We also propose a scenario on how muon events of anomalously high multiplicity and large impact-parameter modulus arise in the Tevatron data.

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21

CONWAY, J. S., and C. LOOMIS. "USING AN ANALOG NEURAL NETWORK TO TRIGGER ON TAU LEPTONS AT CDF." International Journal of Modern Physics C 06, no. 04 (August 1995): 549–54. http://dx.doi.org/10.1142/s0129183195000411.

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At the Collider Detector at Fermilab (CDF), we have designed and implemented a trigger for tau leptons using analog neural network electronics. Tau leptons offer a fertile area of research both for standard model tests and for new physics searches. Because the bulk of tau leptons decay into hadrons, it is challenging to distinguish them from ordinary hadron jets. Neural networks are well suited to this type of difficult classification problem. In this case, software simulations show that an efficiency of 15% with a rejection factor of 100 could be obtained. The input to the network is a 5×5×2 array of calorimeter tower energies surrounding the seed tower of a cluster. If the network’s single output exceeds a tunable threshold, the event is passed to the next stage of the trigger. An existing system based on the Intel ETANN (Electrically Trainable Analog Neural Network) chip was used to implement the tau lepton neural network trigger. The performance of the trigger in current CDF data will be presented.

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22

Caliskan, A. "Single production of composite electrons at future SPPC-based lepton–hadron colliders." Canadian Journal of Physics 98, no. 4 (April 2020): 349–56. http://dx.doi.org/10.1139/cjp-2019-0216.

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We consider the production of excited electrons with spin-1/2 at future SPPC-based electron–proton colliders with center-of-mass energies of 8.4, 11.6, 26.6, and 36.8 TeV. These exotic particles are predicted in the composite models. We calculate the production cross sections and concentrate on the photon decay channel of the excited electrons with the process of ep → e∗X → eγX. The pseudo rapidity and transverse momentum distributions of the electrons and photons in the final state have been plotted to determine the kinematical cutoffs best suited for discovery of the excited electrons. By applying these cutoffs we compute 2σ, 3σ, and 5σ contour plots of the statistical significance of the expected signal in the parameter space (L, m∗), where L denotes the integrated luminosity of the collider and m∗ is the mass of the composite electrons.

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23

Jiang, Xingyu, Jinzhong Han, Biaofeng Hou, and Chunxu Yu. "Single top partner production at lepton colliders in the left–right twin Higgs model." Modern Physics Letters A 33, no. 10n11 (April 10, 2018): 1850057. http://dx.doi.org/10.1142/s0217732318500578.

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In the framework of the left–right twin Higgs (LRTH) model, we investigate the single top partner production at lepton colliders. We calculate the production cross-sections of the processes [Formula: see text], [Formula: see text] [Formula: see text] and [Formula: see text] [Formula: see text] at [Formula: see text] TeV, and display some typical differential distributions of the final state particles.

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24

BRUMMER, NICHOL. "SEARCHES FOR SUSY AT HERA." International Journal of Modern Physics A 16, supp01b (September 2001): 801–3. http://dx.doi.org/10.1142/s0217751x01008138.

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In supersymmetric models with R-parity violation, the [Formula: see text] coupling term allows for single production of a squark in eq fusion. Searches at HERA are presented for the production of such squarks decaying to a lepton and one or more jets.

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25

KUZNETSOV, A. V., N. V. MIKHEEV, and D. A. RUMYANTSEV. "LEPTON PAIR PRODUCTION BY HIGH-ENERGY NEUTRINO IN AN EXTERNAL ELECTROMAGNETIC FIELD." Modern Physics Letters A 15, no. 08 (March 14, 2000): 573–78. http://dx.doi.org/10.1142/s0217732300000578.

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The process of the lepton pair production by a neutrino propagating in an external electromagnetic field is investigated in the framework of the standard model. Relatively simple exact expression for the probability as the single integral, which is suitable for a quantitative analysis, is obtained.

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26

Alikhanov, I. "Single vector leptoquark production at hadron colliders due to direct lepton–gluon interaction." Physics Letters B 717, no. 4-5 (October 2012): 425–29. http://dx.doi.org/10.1016/j.physletb.2012.09.068.

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27

Yokoya, H. "Single Longitudinal-Spin Asymmetries in Lepton-Pair Production at RHIC and J-PARC." Progress of Theoretical Physics 118, no. 2 (August 1, 2007): 371–76. http://dx.doi.org/10.1143/ptp.118.371.

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28

Xi, Yin, Ma Wen-Gan, Wan Lang-Hui, Jiang Yi, and Han Liang. "Single Chargino Production with R-Parity Lepton Number Violation in Photon-Photon Collisions." Communications in Theoretical Physics 36, no. 5 (November 15, 2001): 553–62. http://dx.doi.org/10.1088/0253-6102/36/5/553.

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29

Shoukavy, Dzmitry. "COMET status and plans." EPJ Web of Conferences 212 (2019): 01006. http://dx.doi.org/10.1051/epjconf/201921201006.

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Lepton Flavour Violation in the charged lepton sector (CLFV) is forbidden in the Standard Model. Therefore, the observation of CLFV process would be clear evidence of physics beyond the Standard Model. The COMET (COherent Muon to Electron Transitions) experiment will measure one of these processes: µN → eN at the Japan Proton Accelerator Research Complex in Tokai, Japan. The COMET experiment will be carried out using a two-staged approach. Phase-I of the experiment is aiming at a signal sensitivity of 3.1 × 10−15. Phase-II will use much more intense beam and a more complex transport system to achieve a single-event sensitivity of 3 × 10−17. The article gives an overview of construction and status of the COMET experiment.

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Caliskan, A., and S. O. Kara. "Single production of the excited electrons in the future FCC-based lepton–hadron colliders." International Journal of Modern Physics A 33, no. 24 (August 30, 2018): 1850141. http://dx.doi.org/10.1142/s0217751x18501415.

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We study the composite electron production at the FCC-based three electron–proton colliders with the center-of-mass energies of 3.46, 10 and 31.6 TeV. For the signal process of [Formula: see text], the production cross-sections and decay widths of the excited electrons have been calculated. The differences of some kinematical quantities of the final state particles between the signal and background have been analyzed. For this purpose, transverse momentum and pseudorapidity distributions of electron and photon have been obtained and the kinematical cuts for discovery of the excited electrons have been assigned. We have finally determined the mass limits of excited electrons for observation and discovery by applying these cuts. It is shown that the mass limit for discovery obtained from the collider with [Formula: see text] TeV (called PWFA-LC[Formula: see text]⊗[Formula: see text]FCC) is 22.3 TeV for the integrated luminosity [Formula: see text].

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Barger, V., E. Mirkes, J. Ohnemus, and R. J. N. Phillips. "Further ways to distiguish single-lepton top quark signals from background at the Tevatron." Physics Letters B 344, no. 1-4 (January 1995): 329–33. http://dx.doi.org/10.1016/0370-2693(94)01524-g.

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32

Duc, Dao Vong, Nguyen Mong Giao, and Tran Thanh Dung. "Charge–mass sum rules for unified spinor fields in extradimensions and the prediction for the existence of tachyon quarks and tachyon leptons." Modern Physics Letters A 34, no. 17 (June 7, 2019): 1950130. http://dx.doi.org/10.1142/s021773231950130x.

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Within the framework of the mechanism proposed in our previous works [Duc and Giao, J. Mod. Phys. 5, 477 (2014); Duc et al., Int. J. Theor. Phys. 54, 1071 (2015); Duc and Giao, Int. J. Theor. Phys. 55, 959 (2016)] for mass and charge creation, we consider the charge and mass spectrum of spinor fields in extradimensions. It is shown that a single spinor field in spacetime with extradimensions corresponds to a set of effective spinor fields in ordinary four-dimensional spacetime with charges and masses obeying the sum rules dictated from some specific assumptions related to the compactification of extradimensions. The obtained results allow us to present an example for unifying six existing flavor quarks, as well as for unifying three existing lepton generators. On the base of the derived charge–mass sum rules, we would predict the existence of some hidden tachyon quarks with fractional charges, as well as some hidden tachyon leptons, neutral or negative charged.

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Khatun, Amina, Adam Smetana, and Fedor Šimkovic. "Three Flavor Quasi-Dirac Neutrino Mixing, Oscillations and Neutrinoless Double Beta Decay." Symmetry 12, no. 8 (August 5, 2020): 1310. http://dx.doi.org/10.3390/sym12081310.

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The extension of the Standard model by three right-handed neutrino fields exhibit appealing symmetry between left-handed and right-handed sectors, which is only violated by interactions. It can accommodate three flavor quasi-Dirac neutrino mixing scheme, which allows processes with violation of both lepton flavor and total lepton number symmetries. We propose a 6×6 unitary matrix for parameterizing the mixing among three flavors of quasi-Dirac neutrino. This mixing matrix is constructed by two 3×3 unitary matrices that diagonalizes the Dirac mass term in the Lagrangian. By only assuming the Standard Model V−A weak interaction, it is found that probabilities of neutrino oscillations among active flavor states and effective masses measured by single beta decay, by neutrinoless double-beta decay and by cosmology only depend on single 3×3 unitary matrix relevant to mixing of active neutrino flavors. Further, by considering 1σ and 3σ uncertainties in the measured oscillation probability of electron antineutrino from reactor, derivation of the constraint on the Majorana neutrino mass component is demonstrated. The consequence for effective Majorana neutrino mass governing the neutrinoless double-beta decay is discussed.

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SUN, PENG, and FENG YUAN. "QCD EVOLUTION FOR TRANSVERSE MOMENTUM DEPENDENT OBSERVABLES." International Journal of Modern Physics: Conference Series 25 (January 2014): 1460008. http://dx.doi.org/10.1142/s2010194514600088.

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In this talk, we presented our recent studies of the QCD evolution effects on the transverse momentum dependent observables in semi-inclusive deep inelastic scattering and Drell-Yan lepton pair productions. The evolution is first tested for the spin average cross sections, and then applied to the Sivers single transverse spin asymmetries. The latter are among the important topics in hadronic physics research in recent years.

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Yue, Chong-Xing, Cong Pang, and Yu-Chen Guo. "Lepton flavor violating Higgs couplings and single production of the Higgs boson via eγ collision." Journal of Physics G: Nuclear and Particle Physics 42, no. 7 (June 8, 2015): 075003. http://dx.doi.org/10.1088/0954-3899/42/7/075003.

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36

Alici, E., and M. Köksal. "Probing the anomalous tqγ couplings through single top production at the future lepton–hadron colliders." Modern Physics Letters A 34, no. 36 (November 27, 2019): 1950298. http://dx.doi.org/10.1142/s0217732319502985.

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The measurements of the top quark flavor changing neutral current interactions are one of the most important goals of the top quark physics program in the present and the future collider experiments. These measurements provide direct information on nonstandard interactions of the top quark. Within the framework of new physics beyond the Standard Model, these interactions can be defined by an effective Lagrangian. In this study, we have investigated the potential of the future [Formula: see text] colliders on the top quark flavor changing neutral current interactions through the subprocesses [Formula: see text], where [Formula: see text]. These subprocesses have been produced through the main reaction [Formula: see text] at the LHC-[Formula: see text], the FCC-[Formula: see text] and the SPPC-[Formula: see text]. For the main reaction, the total cross-sections have been calculated as a function of the anomalous [Formula: see text] couplings. In addition, sensitivities on [Formula: see text] at 95% Confidence Level have been calculated. We obtain that the best constraints on [Formula: see text] are at the order of [Formula: see text] which is four orders of magnitude better than the LHC’s experimental results.

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37

Cattaneo, Paolo W., and André Schöning. "MEG II and Mu3e status and plan." EPJ Web of Conferences 212 (2019): 01004. http://dx.doi.org/10.1051/epjconf/201921201004.

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The MEG experiment searching for lepton flavor violating muon decay, finished data taking successfully in 2013. The final sensitivity of the experiment was 5.3 × 10−13, and since the experiment did not find any signal, the upper limit of the branching ratio of the µ → e+γ was set to be 4.2 × 10−13 at 90% C.L.. The MEG II experiment will have a target sensitivity improved by an order of magnitude down to 6 ×10−14 with three years data taking. In 2018 after the detector integration, the muon beam data taking took place with a limited number of readout channels. In 2019, the engineering run and the physics run will be started. The Mu3e experiment will search for the lepton flavor violating decay µ+→ e+e−e+ with unprecedented sensitivity. Construction of the detector is going to start in 2020 and for the first phase a single event sensitivity of 2 × 10−15 is expected.

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Boos, Edward, and Viacheslav Bunichev. "Differences in fully differential cross section of single top quark production and its subsequent decay process depending on various anomalous Wtb couplings." EPJ Web of Conferences 222 (2019): 04007. http://dx.doi.org/10.1051/epjconf/201922204007.

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The fully differential cross sections of t-channel production of a single top quark with its subsequent decay are compared for the case of contributions involving anomalous Wtb couplings. It is shown that the most noticeable differences, for cases corresponding to different anomalous couplings, appear in the shape of two-dimensional distributions, where one of the variables is the energy of a charged lepton and the other is one of the t-quark spin orientation angles.

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39

METZ, ANDREAS, DANIEL PITONYAK, ANDREAS SCHÄFER, MARC SCHLEGEL, WERNER VOGELSANG, and JIAN ZHOU. "SINGLE SPIN ASYMMETRIES IN INCLUSIVE DIS AND MULTI-PARTON CORRELATIONS IN THE NUCLEON." International Journal of Modern Physics: Conference Series 20 (January 2012): 137–44. http://dx.doi.org/10.1142/s2010194512009178.

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Transverse single spin asymmetries in inclusive deep-inelastic lepton-nucleon scattering can be generated through multi-photon exchange between the leptonic and the hadronic part of the process. Here we consider two-photon exchange, and mainly focus on the transverse target spin asymmetry. In particular, we investigate the case where two photons couple to different quarks. Such a contribution involves a quark-photon-quark correlator in the nucleon, which has a (model-dependent) relation to the Efremov-Teryaev-Qiu-Sterman quark-gluon-quark correlator TF. Using different parameterizations for TF we compute the transverse target spin asymmetry for both a proton and a neutron target, and compare the results to recent experimental data. Potential implications on our general understanding of single spin asymmetries in hard scattering processes are discussed as well.

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40

MATSUDA, KOICHI, TATSURU KIKUCHI, TAKESHI FUKUYAMA, and HIROYUKI NISHIURA. "CONSTRAINTS FROM NEUTRINOLESS DOUBLE BETA DECAY." Modern Physics Letters A 17, no. 39 (December 21, 2002): 2597–603. http://dx.doi.org/10.1142/s0217732302009362.

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We examine the constraints from the recent HEIDELBERG–MOSCOW double beta decay experiment. It leads us to the almost degenerate or inverse hierarchy neutrino mass scenario. In this scenario, we obtain possible upper bounds for the Majorana CP violating phase in the lepton sector by incorporating the data from the neutrino oscillation, the single beta decay experiments, and from the astrophysical observation. We also predict the neutrino mass that may be measurable in the future beta decay experiments.

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41

STRANDBERG, JONAS. "MEASUREMENT OF R = B(t→Wb)/B(t→Wq) AT DØ." International Journal of Modern Physics A 20, no. 14 (June 10, 2005): 3200–3202. http://dx.doi.org/10.1142/s0217751x05026145.

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A measurement of the ratio of branching fractions, R = B(t→Wb)/B(t→Wq), with q being any quark with I3 = -1/2 and Q = -1/3, is presented. This analysis considers samples of single- and double-tagged lepton+jets events obtained with the DØ detector, corresponding to integrated luminosities of 169 pb-1 and 158 pb-1, respectively in the e+jets and μ+jets channels. Two different lifetime taggers, CSIP and SVT, are used.

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42

Aad, G., B. Abbott, J. Abdallah, A. A. Abdelalim, A. Abdesselam, O. Abdinov, B. Abi, et al. "Measurement of the top quark pair production cross-section with ATLAS in the single lepton channel." Physics Letters B 711, no. 3-4 (May 2012): 244–63. http://dx.doi.org/10.1016/j.physletb.2012.03.083.

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43

Baarmand, M., M. Hashemi, and A. Nikitenko. "Light charged Higgs discovery potential of CMS in the H± → τντ decay with single lepton trigger." Journal of Physics G: Nuclear and Particle Physics 32, no. 8 (June 19, 2006): N21—N40. http://dx.doi.org/10.1088/0954-3899/32/8/n01.

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44

BRZEZIŃSKI, LONGIN, BOHDAN GRZADKOWSKI, and ZENRŌ HIOKI. "EFFECTS OF NONSTANDARD INTERACTIONS FOR THE ENERGY SPECTRUM OF SECONDARY LEPTONS IN $e^+ e^-\to t\bar t$." International Journal of Modern Physics A 14, no. 08 (March 30, 1999): 1261–81. http://dx.doi.org/10.1142/s0217751x99000646.

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The process of top-quark pair production followed by semileptonic decays at future high-energy e+ e- linear colliders is investigated as a possible test of physics beyond the Standard Model. Assuming the most general nonstandard forms for [Formula: see text], [Formula: see text] and Wtb couplings, the energy spectrum of the single lepton ℓ± and the energy correlation of ℓ+ and ℓ- emerging from the process [Formula: see text] are calculated. Expected precision of the nonstandard-parameter determination is estimated adopting the recently-proposed optimal method.

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45

HADJIDAKIS, CYNTHIA. "EXCLUSIVE π+ PRODUCTION AT HERMES." International Journal of Modern Physics A 20, no. 02n03 (January 30, 2005): 593–95. http://dx.doi.org/10.1142/s0217751x05021877.

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Hard exclusive production in deep inelastic lepton scattering provides access to the unknown Generalized Parton Distributions (GPDs) of the nucleon. At HERMES, the unpolarized total cross section for hard exclusive π+ production have been measured with a 27.6 GeV positron beam on an internal hydrogen gas target. First preliminary results for 1.5<Q2<10.5 GeV 2 and for 0.02<x<0.8 are presented and compared to GPD calculations. Forthcoming measurement for the single-spin asymmetry using a transversally polarized target is also reported.

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46

Baskakov, Alexey, Eduard Boos, Viacheslav Bunichev, Lev Dudko, Maxim Perfilov, and Petr Volkov. "Recommendations for the search of the Anomalous Wtb interactions in the tW-associated Single Top Quark Production." EPJ Web of Conferences 222 (2019): 04010. http://dx.doi.org/10.1051/epjconf/201922204010.

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There are no experimental bounds for the anomalous Wtb couplings provided in the tW-associated single top quark production in the final signature with lepton plus jets so far. The main reason for the situation is the difficulties with the modeling of such a process. Different schemes of the tW-associated single top quark production modeling have different sensitivity to the anomalous Wtb couplings and prospective their constraints are strongly scheme-dependent. The most preferable is the usage of the full gauge-invariant set of the diagrams. However one needs to discriminate the different phase space regions in this case anyway. In the article the separation between top pair and tW-associated single top quark production processes with the help of Neural Network technique is presented. The full scheme with the complete gauge invariant set of Feynman diagrams is used.

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47

Jenkovszky, László. "Spin and Polarization in High-Energy Hadron-Hadron and Lepton-Hadron Scattering." Symmetry 12, no. 11 (October 28, 2020): 1784. http://dx.doi.org/10.3390/sym12111784.

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The role of spin degrees of freedom in high-energy hadron-hadron and lepton-hadron scattering is reviewed with emphasis on the dominant role of soft, diffractive, non-perturbative effects. Explicit models based on analyticity and Regge-pole theory, including the pomeron trajectory (gluon exchange in the t channel) are discussed. We argue that there is a single, universal pomeron in Nature, manifest as relatively “soft” or “hard”, depending on the kinematics considered. Both the pomeron and the non-leading (secondary) Regge trajectories, made of quarks are non-linear, complex functions. They are populated by a finite number of resonances: known baryons and mesons in case of the reggeons and hypothetical glueballs in case of the pomeron (“oddballs” on the odderon trajectory). Explicit models and fits are presented that may be used in recovering generalized parton distributions from deeply virtual Compton scattering and electoproduction of vector mesons.

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48

Albaltan, Weeam S., Alexei Prokudin, and Marc Schlegel. "The transverse nucleon single-spin asymmetry for the semi-inclusive production of photons in lepton-nucleon scattering." Physics Letters B 804 (May 2020): 135367. http://dx.doi.org/10.1016/j.physletb.2020.135367.

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KUMAR, SATENDRA, and P. POULOSE. "Single W production in e − γ collisions through the decay lepton spectrum to probe γ WW couplings." Pramana 79, no. 5 (November 2012): 1247–50. http://dx.doi.org/10.1007/s12043-012-0433-z.

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50

Venanzoni, Graziano. "Measurement of the running of the fine structure constant below 1 GeV with the KLOE detector." EPJ Web of Conferences 218 (2019): 02012. http://dx.doi.org/10.1051/epjconf/201921802012.

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I will report on the recent measurement of the fine structure constant below 1 GeV with the KLOE detector. It represents the first measurement of the running of α(s) in this energy region. Our results show a more than 5σ significance of the hadronic contribution to the running of α(s), which is the strongest direct evidence both in time-and space-like regions achieved in a single measurement. From a fit of the real part of Δα(s) and assuming the lepton universality the branching ratio BR(ω → µ+µ−) = (6.6 ± 1.4stat ± 1.7syst) · 10−5 has been determined

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