Measurement of the CKM angle γ and Bs0‐B¯s0 mixing frequency with Bs0→Ds∓h±π±π∓ decays.

Autor: 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.
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Zdroj: Journal of High Energy Physics; Mar2021, Vol. 2021 Issue 3, p1-46, 46p
Abstrakt: 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. [ABSTRACT FROM AUTHOR]
Databáze: Complementary Index
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