Please use this identifier to cite or link to this item: https://hdl.handle.net/11147/10410
Title: Observation of the Bs0 →x (3872)φ Decay
Authors: Sirunyan,A.M.
Tumasyan,A.
Adam,W.
Ambrogi,F.
Bergauer,T.
Dragicevic,M.
Andreev,V.
Keywords: [No Keyword Available]
Publisher: American Physical Society
Abstract: Using a data sample of proton-proton collisions at s=13 TeV, corresponding to an integrated luminosity of 140 fb-1 collected by the CMS experiment in 2016-2018, the Bs0→X(3872)φ decay is observed. Decays into J/ψ+π- and K+K- are used to reconstruct, respectively, the X(3872) and φ. The ratio of the product of branching fractions B[Bs0→X(3872)φ]B[X(3872)→J/ψ+π-] to the product B[Bs0→(2S)φ]B[ψ(2S)→J/ψ+π-] is measured to be [2.21±0.29(stat)±0.17(syst)]%. The ratio B[Bs0→X(3872)φ]/B[B0→X(3872)K0] is found to be consistent with one, while the ratio B[Bs0→X(3872)φ]/B[B+→X(3872)K+] is two times smaller. This suggests a difference in the production dynamics of the X(3872) in B0 and Bs0 meson decays compared to B+. The reported observation may shed new light on the nature of the X(3872) particle. © 2020 CERN.
URI: https://doi.org/10.1103/PhysRevLett.125.152001
ISSN: 0031-9007
Appears in Collections:PubMed İndeksli Yayınlar Koleksiyonu / PubMed Indexed Publications Collection
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