Abstract : A joint measurement is presented of the branching fractions B0s→μ+μ− and B0→μ+μ− in proton-proton collisions at the LHC by the CMS and LHCb experiments. The data samples were collected in 2011 at a centre-of-mass energy of 7 TeV, and in 2012 at 8 TeV. The combined analysis produces the first observation of the B0s→μ+μ− decay, with a statistical significance exceeding six standard deviations, and the best measurement of its branching fraction so far, and three standard deviation evidence for the B0→μ+μ− decay. The measurements are statistically compatible with SM predictions and impose stringent constraints on several theories beyond the SM.
http://hal.in2p3.fr/in2p3-01084204
Contributeur : Sabine Starita
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Soumis le : mardi 18 novembre 2014 - 16:59:06
Dernière modification le : jeudi 15 mars 2018 - 11:40:09
V. Khachatryan, Y. Amhis, S. Barsuk, M. Borsato, O. Kochebina, et al.. Observation of the rare B0s→μ+μ− decay from the combined analysis of CMS and LHCb data. Nature, Nature Publishing Group, 2015, 522 (7554), pp.68-74. 〈10.1038/nature14474〉. 〈in2p3-01084204〉
