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- Title
Measurement of the CKM angle γ and Bs0‐B¯s0 mixing frequency with Bs0→Ds∓h±π±π∓ decays.
- Authors
Aaij, R.; Abellán Beteta, C.; Ackernley, T.; Adeva, B.; Adinolfi, M.; Afsharnia, H.; Aidala, C. A.; Aiola, S.; Ajaltouni, Z.; Akar, S.; Albrecht, J.; Alessio, F.; Alexander, M.; Alfonso Albero, A.; Aliouche, Z.; Alkhazov, G.; Alvarez Cartelle, P.; Amato, S.; Amhis, Y.; An, L.
- Abstract
The CKM angle γ is measured for the first time from mixing-induced CP violation between B s 0 → D s ∓ K ± π ± π ∓ and B ¯ s 0 → D s ± K ∓ π ∓ π ± decays reconstructed in proton-proton collision data corresponding to an integrated luminosity of 9 fb−1 recorded with the LHCb detector. A time-dependent amplitude analysis is performed to extract the CP-violating weak phase γ − 2βs and, subsequently, γ by taking the B s 0 ‐ B ¯ s 0 mixing phase βs as an external input. The measurement yields γ = (44 ± 12)° modulo 180°, where statistical and systematic uncertainties are combined. An alternative model-independent measurement, integrating over the five-dimensional phase space of the decay, yields γ = 44 − 13 + 20 ° modulo 180°. Moreover, the B s 0 ‐ B ¯ s 0 oscillation frequency is measured from the flavour-specific control channel B s 0 → D s − π + π + π − to be ∆ms = (17.757 ± 0.007(stat) ± 0.008(syst)) ps−1, consistent with and more precise than the current world-average value.
- Subjects
CP violation; PROTON-proton interactions; FREQUENCIES of oscillating systems; PHASE space; HADRON-hadron scattering
- Publication
Journal of High Energy Physics, 2021, Vol 2021, Issue 3, p1
- ISSN
1126-6708
- Publication type
Article
- DOI
10.1007/JHEP03(2021)137