A measurement of the CP-violating parameters in B0s → Ds∓ K± decays is reported, based on the analysis of proton-proton collision data collected by the LHCb experiment corresponding to an integrated luminosity of 6 fb^−1 at a centre-of-mass energy of 13 TeV. The measured parameters are C_f = 0.791 ± 0.061 ± 0.022, A_f^ΔΓ = −0.051 ± 0.134 ± 0.058, A_anti-f^ΔΓ = −0.303 ± 0.125 ± 0.055, S_f= −0.571 ± 0.084 ± 0.023 and S_anti-f = −0.503 ± 0.084 ± 0.025, where the first uncertainty is statistical and the second systematic. This corresponds to CP violation in the interference between mixing and decay of about 8.6 σ. Together with the value of the Bs0 mixing phase −2βs, these parameters are used to obtain a measurement of the CKM angle γ equal to (74 ± 12)º modulo 180º, where the uncertainty contains both statistical and systematic contributions. This result is combined with the previous LHCb measurement in this channel using 3 fb^−1 resulting in a determination of γ=(81{−11}{+12})º.

Aaij, R., Abdelmotteleb, A.S.W., Abellan Beteta, C., Abudinén, F., Ackernley, T., Adefisoye, A.A., et al. (2025). Measurement of CP asymmetry in B0s → Ds∓ K± decays. JOURNAL OF HIGH ENERGY PHYSICS, 2025(3), 0-32 [10.1007/jhep03(2025)139].

Measurement of CP asymmetry in B0s → Ds∓ K± decays

Carbone, A.;Ferrari, F.;Galli, D.;Patrignani, C.;Spedicato, E.;Villa, A.;Zenesini, F.;
2025

Abstract

A measurement of the CP-violating parameters in B0s → Ds∓ K± decays is reported, based on the analysis of proton-proton collision data collected by the LHCb experiment corresponding to an integrated luminosity of 6 fb^−1 at a centre-of-mass energy of 13 TeV. The measured parameters are C_f = 0.791 ± 0.061 ± 0.022, A_f^ΔΓ = −0.051 ± 0.134 ± 0.058, A_anti-f^ΔΓ = −0.303 ± 0.125 ± 0.055, S_f= −0.571 ± 0.084 ± 0.023 and S_anti-f = −0.503 ± 0.084 ± 0.025, where the first uncertainty is statistical and the second systematic. This corresponds to CP violation in the interference between mixing and decay of about 8.6 σ. Together with the value of the Bs0 mixing phase −2βs, these parameters are used to obtain a measurement of the CKM angle γ equal to (74 ± 12)º modulo 180º, where the uncertainty contains both statistical and systematic contributions. This result is combined with the previous LHCb measurement in this channel using 3 fb^−1 resulting in a determination of γ=(81{−11}{+12})º.
2025
Aaij, R., Abdelmotteleb, A.S.W., Abellan Beteta, C., Abudinén, F., Ackernley, T., Adefisoye, A.A., et al. (2025). Measurement of CP asymmetry in B0s → Ds∓ K± decays. JOURNAL OF HIGH ENERGY PHYSICS, 2025(3), 0-32 [10.1007/jhep03(2025)139].
Aaij, R.; Abdelmotteleb, A. S. W.; Abellan Beteta, C.; Abudinén, F.; Ackernley, T.; Adefisoye, A. A.; Adeva, B.; Adinolfi, M.; Adlarson, P.; Agapopoul...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/1010252
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