Abstract
Precise measurements of CP violation provide stringent tests of the Standard Model towards a search for signs of New Physics. The decay-time dependent CP asymmetry in \({{\mathrm {B}} ^0_{\mathrm {s}}} \rightarrow {{\mathrm {J} /\uppsi }} \phi \) decays has been measured using proton-proton, \({\mathrm {p}} {\mathrm {p}} \), collision data, collected with the LHCb detector. The CP-violating phase \(\phi _{{\mathrm {s}}}\) is measured, along with the difference in decay widths of the light and heavy mass eigenstates of the \({{\mathrm {B}} ^0_{\mathrm {s}}}-{{\,\overline{\mathrm {B}}{}} {}^0_{\mathrm {s}}} \) system, and the average \({{\mathrm {B}} ^0_{\mathrm {s}}} \) decay width. Discussed are also data-driven corrections to simulated event samples, and the control of systematic effects using data control sample. Prospects for the sensitivity that can be achieved with future LHCb data taking periods will be also given.
On behalf of LHCb Collaboration.
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References
M. Kobayashi, T. Maskawa, CP violation in the renormalizable theory of weak interaction. Prog. Theor. Phys. 49, 652 (1973). https://doi.org/10.1143/PTP.49.652
A.D. Sakharov, Violation of CP invariance, C asymmetry, and baryon asymmetry of the universe. Pisma Zh. Eksp. Teor. Fiz. 5, 32 (1967). https://doi.org/10.1070/PU1991v034n05ABEH002497. [JETP Lett. 5, 24 (1967)] [Sov. Phys. Usp. 34(5), 392 (1991)] [Usp. Fiz. Nauk 161(5), 61 (1991)]
J. Charles et al., Current status of the standard model CKM fit and constraints on \(\Delta F=2\) new physics. Phys. Rev. D 91(7), 073007 (2015). https://doi.org/10.1103/PhysRevD.91.073007, arXiv:1501.05013
Z. Ligeti, M. Papucci, G. Perez, Implications of the measurement of the \(B^0_{s} - \bar{B}^0_s\) mass difference. Phys. Rev. Lett. 97, 101801 (2006). https://doi.org/10.1103/PhysRevLett.97.101801, arXiv:0604112
R. Aaij, et al., [LHCb Collaboration]: precision measurement of the \(B^{0}_{s}\)-\(\bar{B}^{0}_{s}\) oscillation frequency with the decay \(B^{0}_{s}\rightarrow D^{-}_{s}\pi ^{+}\). New J. Phys. 15, 053021 (2013). https://doi.org/10.1088/1367-2630/15/5/053021, arXiv:1304.4741
A. Simon, Recent Improvements and Prospects with Flavour Tagging at LHCb [LHCb-TALK-2018-304] (2018). http://cds.cern.ch/record/2630477
R. Aaij, et al., [LHCb Collaboration]: precision measurement of \(CP\) violation in \(B_s^0 \rightarrow J/\psi K^+K^-\) decays. Phys. Rev. Lett. 114(4), 041801 (2015). https://doi.org/10.1103/PhysRevLett.114.041801, arXiv:1411.3104
Y. Xie, sFit: a method for background subtraction in maximum likelihood fit, arXiv:0905.0724
R. Aaij et al., [LHCb Collaboration]: resonances and \(CP\) violation in \(B_s^0\) and \(\overline{B}_s^0 \rightarrow J/\psi K^+K^-\) decays in the mass region above the \(\phi (1020)\). JHEP 1708, 037 (2017). https://doi.org/10.1007/JHEP08(2017)037, arXiv:1704.08217
R. Aaij et al., [LHCb Collaboration]: first study of the CP -violating phase and decay-width difference in \(B_s^0\rightarrow \psi (2S)\phi \) decays. Phys. Lett. B 762, 253 (2016). https://doi.org/10.1016/j.physletb.2016.09.028. arXiv:1608.04855
R. Aaij et al., [LHCb Collaboration]: measurement of the CP-violating phase \(\phi _s\) in \(\overline{B}^0_s \rightarrow J/\psi \pi ^+\pi ^-\) decays. Phys. Lett. B 713, 378 (2012). https://doi.org/10.1016/j.physletb.2012.06.032, arXiv:1204.5675
R. Aaij et al., [LHCb Collaboration]: LHCb detector performance. Int. J. Mod. Phys. A 30(07), 1530022 (2015). https://doi.org/10.1142/S0217751X15300227, arXiv:1412.6352
S. Faller, M. Jung, R. Fleischer, T. Mannel, The golden modes B0 —\(>\) J/psi K(S,L) in the era of precision flavour physics. Phys. Rev. D 79, 014030 (2009). https://doi.org/10.1103/PhysRevD.79.014030, arXiv:0809.0842
K. De Bruyn, R. Fleischer, A roadmap to control penguin effects in \(B^0_d\rightarrow J/\psi K_{\rm S}^0\) and \(B^0_s\rightarrow J/\psi \phi \). JHEP 1503, 145 (2015). https://doi.org/10.1007/JHEP03(2015)145, arXiv:1412.6834
R. Aaij, et al., [LHCb Collaboration]: measurement of CP violation parameters and polarisation fractions in \( {\rm B\mathit{}_{\rm s}}^0\rightarrow \rm J\mathit{/\psi {\overline{\rm K}}}^{\ast 0} \) decays. JHEP 1511, 082 (2015). https://doi.org/10.1007/JHEP11(2015)082, arXiv:1509.00400
R. Aaij et al., [LHCb Collaboration]: measurement of the CP-violating phase \(\beta \) in \(B^0\rightarrow J/\psi \pi ^+\pi ^-\) decays and limits on penguin effects. Phys. Lett. B 742, 38 (2015). https://doi.org/10.1016/j.physletb.2015.01.008, arXiv:1411.1634
R. Aaij et al., [LHCb Collaboration]: measurement of CP violation and the \(B^0_s\) meson decay width difference with \(B^0_s\rightarrow J/\psi K^+K^-\) and \(B^0_s\rightarrow J/\psi \pi ^+\pi ^-\) decays. Phys. Rev. D 87(11), 112010 (2013). https://doi.org/10.1103/PhysRevD.87.112010, arXiv:1304.2600
Y. Amhis et al., [HFLAV Collaboration]: averages of \(b\)-hadron, \(c\)-hadron, and \(\tau \)-lepton properties as of summer 2016. Eur. Phys. J. C 77(12), 895 (2017). https://doi.org/10.1140/epjc/s10052-017-5058-4, arXiv:1612.07233
I. Bediaga et al., [LHCb Collaboration]: physics case for an LHCb upgrade II -opportunities in flavour physics, and beyond, in the HL-LHC era, arXiv:1808.08865
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Gizdov, K. (2019). Measurement of CP Violation in \({{\mathrm {B}} ^0_{\mathrm {s}}} \rightarrow {{\mathrm {J} /\uppsi }} \phi \) Decays. In: Giri, A., Mohanta, R. (eds) 16th Conference on Flavor Physics and CP Violation. FPCP 2018. Springer Proceedings in Physics, vol 234. Springer, Cham. https://doi.org/10.1007/978-3-030-29622-3_33
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