Observation of the Bs0 →x (3872)φ Decay

(CMS Collaboration)

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

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.

Original languageEnglish
Article number152001
JournalPhysical review letters
Volume125
Issue number15
DOIs
Publication statusPublished - 2020 Oct

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Fingerprint Dive into the research topics of 'Observation of the Bs0 →x (3872)φ Decay'. Together they form a unique fingerprint.

Cite this