Study of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>C</mml:mi><mml:mi>P</mml:mi></mml:math>-violating charge asymmetries of single muons and like-sign dimuons in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>p</mml:mi><mml:mover accent="true"><mml:mi>p</mml:mi><mml:mo stretchy="false">¯</mml:mo></mml:mover></mml:math>collisions

Abazov, V. M.; Abbott, B.; Acharya, B. S.; Adams, M. R.; Adams, T.; Agnew, J. P.; Alexeev, G. D.; Alkhazov, G.; Alton, A.; Askew, A.; Atkins, S.; Augsten, K.; Ávila, C.; Badaud, F.; Bagby, L.; Baldin, B.; Bandurin, D. V.; Banerjee, S.; Barberis, E.; Baringer, P.; Bartlett, J. F.; Bassler, U.; Bazterra, V. E.; Bean, A.; Begalli, M.; Bellantoni, L.; Beri, S. B.; Bernardi, G.; Bernhard, R.; Bertram, I.; Besançon, M.; Beuselinck, R.; Bhat, P. C.; Bhatia, S.; Bhatnagar, V.; Blazey, G.; Blessing, S.; Bloom, K.; Boehnlein, A.; Boline, D.; Boos, E.; Borissov, G.; Brandt, A.; Brandt, O.; Brock, R.; Bross, A.; Brown, D.; Bu, X. B.; Buehler, M.; Buescher, V.; Bunichev, V.; Burdin, S.; Buszello, C. P.; Camacho-Pérez, E.; Casey, B. C.K.; Castilla‐Valdez, H.; Caughron, S.; Chakrabarti, S.; Chan, K. M.; Chandra, A.; Chapon, É.; Chen, G.; Cho, S. W.; Choi, S.; Choudhary, B. C.; Cihangir, S.; Claes, D. R.; Clutter, J.; Cooke, M.; Cooper, W. E.; Corcoran, M.; Couderc, F.; Cousinou, M. C.; Ćutts, D.; Das, A.; Davies, G.; Jong, S. J. De; Cruz-Burelo, E. De La; Déliot, F.; Démina, R.; Denisov, D.; Denisov, S. P.; Desai, S.; Deterre, C.; Devaughan, K.; Diehl, H. T.; Diesburg, M.; Ding, P. F.; Dominguez, A.; Dubey, A.; Dudko, L.; Duperrin, A.; Dutt, S.; Eads, M.; Edmunds, D.; Ellison, J.; Elvira, V. D.; Enari, Y.; Evans, H.; Евдокимов, В. Н.; Liu, Feng; Ferbel, T.; Fiedler, F.; Filthaut, F.; Fisher, W. C.; Fisk, H. E.; Fortner, M.; Fox, H.; Fuess, S.; Garbincius, P. H.; García-Bellido, A.; García-González, J. A.; Gavrilov, V.; Geng, W.; Gerber, C. E.; Gershtein, Y.; Ginther, G.; Golovanov, G.; Grannis, P. D.; Greder, S.; Greenlee, H.; Grenier, G.; Gris, Ph.; Grivaz, J.-F.; Grohsjean, A.; Grünendahl, S.; Grünewald, M.; Guillemin, T.; Gutiérrez, G.; Gutiérrez, P.; Haley, J.; Liu, Han; Harder, K.; Harel, A.; Hauptman, J. M.; Hays, J.; Head, T.; Hebbeker, T.; Hedin, D.; Hegab, H.; Heinson, A. P.; Heintz, U.; Hensel, C.; Cruz, I. Heredia-De La; Herner, K.; Hesketh, G. G.; Hildreth, M.; Hirosky, R.; Hoang, T.; Hobbs, J.; Hoeneisen, B.; Hogan, J. M.; Hohlfeld, M.; Holzbauer, J. L.; Howley, I.; Hubáček, Z.; Hynek, V.; Iashvili, I.; Ilchenko, Y.; Illingworth, R.; Ito, A. S.; Jabeen, S.; Jaffré, M.; Jayasinghe, A.; Jeong, M. S.; Jesik, R.; Jiang, Peng; Johns, K. A.; Johnson, E.; Johnson, M.; Jonckheere, A.; Jönsson, P.; Joshi, J.; Jung, Andreas Werner; Rozas, A. Juste; Kajfasz, E.; Karmanov, D.; Katsanos, I.; Kehoe, R.; Kermiche, S.; Khalatyan, N.; Khanov, A.; Kharchilava, A.; Kharzheev, Y. N.; Kiselevich, I.; Kohli, J. M.; Kozelov, A. V.; Kraus, J.; Kumar, Ashok; Kupčo, A.; Kurča, T.; Kuzmin, V. A.; Lammers, S.; Lebrun, P.; Lee, H. S.; Lee, S. W.; Lee, W. M.; Lei, X.; Lellouch, J.; Li, D.; Li, H.; Li, L.; Li, Q. Z.; Lim, Jaehoon; Lincoln, D.; Linnemann, J.; Lipaev, V. V.; Lipton, R.; Liu, H.; Liu, Y.; Lobodenko, A.; Lokajı́ček, M.; De, R. Lopes; Luna-García, R.; Lyon, A. L.; Maciel, A. K.A.; Madar, R.; Magaña-Villalba, R.; Malik, S.; Malyshev, V. L.; Mansour, J. D.; Martínez-Ortega, J.; McCarthy, R. L.; McGivern, C. L.; Meijer, M. M.; Melnitchouk, A.; Menezes, D.; Mercadante, P. G.; Merkin, M.; Meyer, A.; Meyer, J.; Miconi, F.; Mondal, N. K.; Mulhearn, M.; Nagy, E.; Narain, M.; Nayyar, R.; Neal, H. A.; Negret, J. P.; Neustroev, P.; Nguyen, H.; Nunnemann, T.; Orduna, J.; Osman, N.; Osta, J.; Pal, A.; Parashar, N.; Parihar, V.; Park, S. K.; Partridge, R.; Parua, N.; Patwa, A.; Penning, B.; Perfilov, M.; Peters, Y.; Petridis, K.; Petrillo, G.; Pétroff, P.; Pleier, M. A.; Podstavkov, V. M.; Попов, А. В.; Prewitt, M.; Price, D.; Prokopenko, N.; Qian, J.; Quadt, A.; Quinn, B.; Ratoff, P. N.; Razumov, I.; Ripp-Baudot, I.; Rizatdinova, F.; Rominsky, M.; Ross, A.; Royon, C.; Rubinov, P.; Ruchti, R.; Sajot, G.; Sánchez-Hernández, A.; Sanders, M. P.; Santos, A. S.; Savage, G.; Sawyer, L.; Scanlon, T.; Schamberger, R. D.; Scheglov, Y.; Schellman, H.; Schwanenberger, C.; Schwienhorst, R.; Sekaric, J.; Severini, H.; Shabalina, E.; Shary, V.; Shaw, S.; Shchukin, A. A.; Šimák, V.; Skubic, P.; Slattery, P.; Smirnov, D.; Snow, G. R.; Snow, J.; Snyder, S.; Söldner-Rembold, S.; Sonnenschein, L.; Soustružnı́k, K.; Stark, J.; Stoyanova, D. A.; Strauss, M.; Suter, L.; Svoisky, P.; Titov, M.; Tokmenin, V. V.; Tsai, Y. T.; Tsybychev, D.; Tuchming, B.; Tully, C.; Uvarov, L.; Uvarov, S.; Uzunyan, S.; Kooten, R. Van; Leeuwen, W. M. Van; Varelas, N.; Varnes, E. W.; Vasilyev, I. A.; Verkheev, A. Y.; Vertogradov, L. S.; Verzocchi, M.; Vesterinen, M.; Vilanova, D.; Vokáč, P.; Wahl, H. D.; Wang, Michael; Warchol, J.; Watts, G.; Wayne, M.; Weichert, J.; Welty-Rieger, L.; Williams, Mark Richard James; Wilson, G. W.; Wobisch, M.; Wood, D.; Wyatt, T. R.; Xie, Y.; Yamada, R.; Yang, S.; Yasuda, T.; Yatsunenko, Y. A.; Ye, W.; Ye, Z.; Yin, H.; Yip, K.; Youn, S. W.; Yu, J.; Zennamo, J.; Zhao, T.; Zhou, B.; Zhu, J.; Zieliński, M.; Ziemińska, D.; Živković, L.

doi:10.1103/physrevd.89.012002

Cited by 67 publications

(103 citation statements)

References 26 publications

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“…(Ligeti et al, 2010) and the discussion in (Lenz, 2011) and the references therein. In the last years this was also related to the unexpected measurement of a large value of the dimuon asymmetry by the D0 collaboration (Abazov et al, 2010a(Abazov et al, ,b, 2011(Abazov et al, , 2014. In 2012 the issue of ∆Γ s was solved experimentally by a direct measurement of this quantity by the LHCb Collaboration.…”

Section: Heavy Quark Expansionmentioning

confidence: 98%

“…A more detailed analysis of the uncertainties can be found in Appendix B. Measurements of the dimuon asymmetry triggered a lot of interest in B 0 and B 0 s mixing, because early measurements seemed to indicate large new physics effects (Abazov et al, 2010a(Abazov et al, ,b, 2011(Abazov et al, , 2014. Originally, the dimuon asymmetry A CP was considered to be given by a linear combination of the semileptonic CP asymmetries in the B 0 and the B 0 s system (see e.g.…”

Section: We Get As New Standard Model Valuesmentioning

confidence: 99%

“…In 2013 Borissov and Hoeneisen (Borissov and Hoeneisen, 2013) found that there is actually also an additional contribution from indirect CP violation. This led to the following new interpretation (also used in (Abazov et al, 2014))…”

Section: We Get As New Standard Model Valuesmentioning

confidence: 99%

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CP violation in the Bs0 system

2016

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We review experimental and theoretical studies of CP violation in the B 0 s system. Updated predictions for the mixing parameters of the B 0 s mesons expected in the Standard Model (SM) are given, namely the mass difference ∆M SM s = (18.3±2.7) ps −1 , the decay rate difference ∆Γ SM s = (0.085 ± 0.015) ps −1 , and the flavour specific CP asymmetry a s,SM fs = (2.22 ± 0.27) × 10 −5 and the equivalent quantities in the B 0 -sector. Current experimental values of ∆Ms and ∆Γs agree with remarkable precision with theoretical expectations. This agreement supports the applicability of theoretical tools such as the Heavy Quark Expansion (HQE) to these decays. CP violating studies in the B 0 s system provide essential information to test the SM expectations, and to unveil possible contribution of the new physics (NP). NP effects on ∆Ms of the order of 15% are still possible. The CP phase φs due to CP violation in interference of decays and mixing can accommodate effects of the order of O(100%). The semileptonic CP asymmetry a s sl due to CP violation in mixing could still be a factor of 130 larger than its robust SM expectation and thus provides a very clean observable for NP searches. Theoretical improvements that are necessary to make full use of the experimental precision are discussed.

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Section: Heavy Quark Expansionmentioning

confidence: 98%

Section: We Get As New Standard Model Valuesmentioning

confidence: 99%

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CP violation in the Bs0 system

2016

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“…For CPTV to explain the difference between the likesign dimuon asymmetry [3] and the SM requires that (∆a T − 0.396∆a Z ) to be of the order of 10 −12 GeV [5]. These limits imply that CPT violation is unlikely to contribute a significant fraction of the observed dimuon charge asymmetry, and that other explanations need to be sought.…”

Section: And D ±mentioning

confidence: 99%

“…Due to this, B 0 s -B 0 s oscillations form an interferometric system that is very sensitive to small couplings between the valence quarks and a possible Lorentz-invariance violating field, making it an ideal place to search for new physics [2]. The measurement of the like-sign dimuon asymmetry by the D0 Collaboration [3] shows evidence of anomalously large CP-violating effects. This is currently one of the few significant deviations from the standard model of particle physics.…”

mentioning

confidence: 99%

Search for Violation ofCPTand Lorentz Invariance inBs0Meson Oscillations

Abazov¹,

Abbott²,

Acharya³

et al. 2015

Phys. Rev. Lett.

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We present the first search for CPT-violating effects in the mixing of B 0 s mesons using the full Run II data set with an integrated luminosity of 10.4 fb −1 of proton-antiproton collisions collected using the D0 detector at the Fermilab Tevatron Collider. We measure the CPT-violating asymmetry in the decay B 0 s → µ ± D ± s as a function of celestial direction and sidereal phase. We find no evidence for CPT-violating effects and place limits on the direction and magnitude of flavor-dependent CPTand Lorentz-invariance violating coupling coefficients. We find 95% confidence intervals of ∆a ⊥ < 1.2 × 10 −12 GeV and (−0.8 < ∆aT − 0.396∆aZ < 3.9) × 10 −13 GeV.PACS numbers: 11.30. Cp, 13.20.He, 14.40.Nd Lorentz invariance requires that the description of a particle is independent of its direction of motion or boost velocity. The Standard Model Extension (SME) [1] provides a framework for potential Lorentz and CPT invariance violation (CPTV), suggesting that such violations can occur at the Planck scale but still result in potentially observable effects at currently available collider energies. The process of neutral meson oscillations is described by a 2 × 2 effective Hamiltonian with mass eigenvalues of the propagating particles having very small differences between them that drive the oscillation probability. For the B 0 s -B 0 s system, the fractional difference between the eigenvalues is of the order of 10 −12 . Due to this, B 0 s -B 0 s oscillations form an interferometric system that is very sensitive to small couplings between the valence quarks and a possible Lorentz-invariance violating field, making it an ideal place to search for new physics [2]. The measurement of the like-sign dimuon asymmetry by the D0 Collaboration [3] shows evidence of anomalously large CP-violating effects. This is currently one of the few significant deviations from the standard model of particle physics. One of the interpretations of this effect could be a CPT-invariant CP violation (CPV) in neutral B-meson mixing. The propagating "light" (L) and "heavy" (H) mass eigenvalues of the B 0 s -B 0 s system can be written as [4]:If the complex parameter ξ s is zero, CPT is conserved and CPV is due to |q/p| = 1 so that the oscillation probability). An alternative interpretation is that the asymmetry could arise from T-invariant CPV in B 0 s -B 0 s mixing [5] where |q/p| = 1, but ξ s is non-zero so that the probability of non-oscillation or oscillation back to the original state where ∆a µ is a four vector direction and magnitude in space-time characterizing Lorentz-invariance violation which in the SME is given by ∆a µ = r s a s µ −r b a b µ where a q µ are Lorentz-violating coupling constants for the two valence quarks in the B 0 s meson, and where the factors r q allow for quark-binding or other normalization effects. The four-velocity of the B 0 s meson is given by β µ = γ(1, β), β µ ∆a µ is the difference between the diagonal elements of the effective Hamiltonian, and the mass and decay rate differences of the mass eigenstates are...

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Measurements of charge and CP asymmetries in b-hadron decays using top-quark events collected by the ATLAS detector in pp collisions at s = 8 $$ \sqrt{s}=8 $$ TeV

Kempster

2017

J. High Energ. Phys.

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Same-and opposite-sign charge asymmetries are measured in lepton+jets tt events in which a b-hadron decays semileptonically to a soft muon, using data corresponding to an integrated luminosity of 20.3 fb −1 from proton-proton collisions at a centre-of-mass energy of √ s = 8 TeV collected with the ATLAS detector at the Large Hadron Collider at CERN. The charge asymmetries are based on the charge of the lepton from the top-quark decay and the charge of the soft muon from the semileptonic decay of a b-hadron and are measured in a fiducial region corresponding to the experimental acceptance. Four CP asymmetries (one mixing and three direct) are measured and are found to be compatible with zero and consistent with the Standard Model. Keywords: Hadron-Hadron scattering (experiments)ArXiv ePrint: 1610.07869Open Access, Copyright CERN, for the benefit of the ATLAS Collaboration. Article funded by SCOAP 3 .doi:10.1007/JHEP02(2017)071 The ATLAS collaboration 30 JHEP02(2017)071 IntroductionThe violation of the combined charge conjugation (C) and parity transformation (P) of particles and antiparticles implies that the laws of physics are not the same for matter and antimatter. The study of CP violation, first observed in neutral kaon decays in 1964 by Christenson, Cronin, Fitch and Turlay [1], has a long and rich history within particle physics. Since the first observation, CP violation in mixing has also been observed in neutral B d and B s mesons [2][3][4], and direct CP violation has been observed in kaon decays [5][6][7] and B-meson decays [8][9][10][11][12]. However, these observations are not sufficient to explain the matter-antimatter asymmetry in the universe [13]. In addition, a sizeable inclusive like-sign dimuon charge asymmetry (using a sample of primarily bb pairs) has been reported [14] by the D0 experiment in which an excess was observed over that predicted by the Standard Model (SM), when the measurement is interpreted in the form of CP asymmetries relevant - [18] makes it possible to perform measurements of CP asymmetries in heavy-flavour mixing and decay from top-quark decay products, as outlined in ref. [19]. All existing analyses of CP violation in B-meson decays rely on a resonant production of bb pairs or hadroproduction. The unique aspect presented in this paper is the method by which the charge of the b-quark is determined, both at production and at decay. The top quark decays before hadronisation, predominantly via t → W b. In the case where the W -boson decays leptonically, the charge of the lepton determines the charge of the produced b-quark. The b-quark hadronises and in the case that the resulting b-hadron decays semileptonically, the charge of the soft lepton determines the b-quark charge at decay. This paper exploits a soft-muon heavy-flavour tagging (SMT) algorithm [20, 21] in order to measure muons that originate from such a process, hereafter referred to as SMT muons. In principle this process may also be observed via soft electrons or soft τ leptons; however, in practice the...

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Study ofCP-violating charge asymmetries of single muons and like-sign dimuons inpp¯collisions

Cited by 67 publications

References 26 publications

CP violation in the Bs0 system

CP violation in the Bs0 system

Search for Violation ofCPTand Lorentz Invariance inBs0Meson Oscillations

Measurements of charge and CP asymmetries in b-hadron decays using top-quark events collected by the ATLAS detector in pp collisions at s = 8 $$ \sqrt{s}=8 $$ TeV

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