Measurement of the relative B-$\rightarrow$D0/D\ast0/D\ast\ast0$\upmu$-$\upnu$¯$\upmu$ branching fractions using B- mesons from B¯s2\ast0 decaysстатья
Статья опубликована в высокорейтинговом журнале
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Дата последнего поиска статьи во внешних источниках: 20 ноября 2020 г.
Аннотация:The decay of the narrow resonance B¯¯¯¯∗0s2→B−K+ can be used to determine the B− momentum in partially reconstructed decays without any assumptions on the decay products of the B− meson. This technique is employed for the first time to distinguish contributions from D0, D∗0, and higher-mass charmed states (D∗∗0) in semileptonic B− decays by using the missing-mass distribution. The measurement is performed using a data sample corresponding to an integrated luminosity of 3.0 fb−1 collected with the LHCb detector in pp collisions at center-of-mass energies of 7 and 8 TeV. The resulting branching fractions relative to the inclusive B−→D0Xμ−ν¯¯¯μ are fD0=B(B−→D0μ−ν¯¯¯μ)/B(B−→D0Xμ−ν¯¯¯μ)=0.25±0.06, fD∗∗0=B(B−→(D∗∗0→D0X)μ−ν¯¯¯μ)/B(B−→D0Xμ−ν¯¯¯μ)=0.21±0.07, with fD∗0=1−fD0−fD∗∗0 making up the remainder.