Measurement of the CKM angle γ and Bs0-B¯s0 mixing frequency with Bs0→Ds∓h±π±π∓ decays
| Parent link: | Journal of High Energy Physics Vol. 2021, iss. 3.— 2021.— [137, 45 p.] |
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| Corporate Authors: | , |
| Other Authors: | , , , , , , |
| Summary: | Title screen The CKM angle γ is measured for the first time from mixing-induced CP violation between Bs0→Ds∓K±π±π∓ and B¯s0→Ds±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 B0s-B¯¯¯¯0sBs0-B¯s0 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 Bs0-B¯s0 oscillation frequency is measured from the flavour-specific control channel Bs0→Ds−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. |
| Published: |
2021
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| Subjects: | |
| Online Access: | http://earchive.tpu.ru/handle/11683/80986 https://doi.org/10.1007/JHEP03(2021)137 |
| Format: | Electronic Book Chapter |
| KOHA link: | https://koha.lib.tpu.ru/cgi-bin/koha/opac-detail.pl?biblionumber=664695 |