A flavor-tagged time-dependent angular analysis of the decay B0s → ϕ ϕ is performed using p p collision data collected by the LHCb experiment at the center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 6 fb^−1. The CP-violating phase and direct CP-violation parameter are measured to be ϕ_s^{s anti-s s} = − 0.042 ± 0.075 ± 0.009 rad and |λ| = 1.004 ± 0.030 ± 0.009, respectively, assuming the same values for all polarization states of the ϕ ϕ system. In these results, the first uncertainties are statistical and the second systematic. These parameters are also determined separately for each polarization state, showing no evidence for polarization dependence. The results are combined with previous LHCb measurements using p p collisions at center-of-mass energies of 7 and 8 TeV, yielding ϕ_s^{s anti-s s} = −0.074 ± 0.069 rad and |λ| = 1.009 ± 0.030. This is the most precise study of time-dependent CP violation in a penguin-dominated B meson decay. The results are consistent with CP symmetry and with the standard model predictions.

Aaij, R., Abdelmotteleb, A., Abellan Beteta, C., Abudinén, F., Ackernley, T., Adeva, B., et al. (2023). Precision Measurement of CP Violation in the Penguin-Mediated Decay B0s → ϕ ϕ. PHYSICAL REVIEW LETTERS, 131(17), 1-12 [10.1103/PhysRevLett.131.171802].

Precision Measurement of CP Violation in the Penguin-Mediated Decay B0s → ϕ ϕ

Carbone, A.;Ferrari, F.;Galli, D.;Manuzzi, D.;Patrignani, C.;Spedicato, E.;Villa, A.;Zucchelli, S.;
2023

Abstract

A flavor-tagged time-dependent angular analysis of the decay B0s → ϕ ϕ is performed using p p collision data collected by the LHCb experiment at the center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 6 fb^−1. The CP-violating phase and direct CP-violation parameter are measured to be ϕ_s^{s anti-s s} = − 0.042 ± 0.075 ± 0.009 rad and |λ| = 1.004 ± 0.030 ± 0.009, respectively, assuming the same values for all polarization states of the ϕ ϕ system. In these results, the first uncertainties are statistical and the second systematic. These parameters are also determined separately for each polarization state, showing no evidence for polarization dependence. The results are combined with previous LHCb measurements using p p collisions at center-of-mass energies of 7 and 8 TeV, yielding ϕ_s^{s anti-s s} = −0.074 ± 0.069 rad and |λ| = 1.009 ± 0.030. This is the most precise study of time-dependent CP violation in a penguin-dominated B meson decay. The results are consistent with CP symmetry and with the standard model predictions.
2023
Aaij, R., Abdelmotteleb, A., Abellan Beteta, C., Abudinén, F., Ackernley, T., Adeva, B., et al. (2023). Precision Measurement of CP Violation in the Penguin-Mediated Decay B0s → ϕ ϕ. PHYSICAL REVIEW LETTERS, 131(17), 1-12 [10.1103/PhysRevLett.131.171802].
Aaij, R.; Abdelmotteleb, A. S. W.; Abellan Beteta, C.; Abudinén, F.; Ackernley, T.; Adeva, B.; Adinolfi, M.; Adlarson, P.; Afsharnia, H.; Agapopoulou,...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/953719
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