Observation of the B-s(0) -> X(3872)phi Decay

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The CMS Collaboration , Eerola , P , Forthomme , L , Kirschenmann , H , Osterberg , K , Voutilainen , M , Brucken , E , Garcia , F , Havukainen , J , Kim , M , Kinnunen , R , Lampen , T , Lassila-Perini , K , Laurila , S , Lehti , S , Linden , T , Siikonen , H , Tuominen , E , Tuominiemi , J , Luukka , P , Viinikainen , J , Karimäki , V , Tuuva , T & Sirunyan , A M 2020 , ' Observation of the B-s(0) - > X(3872)phi Decay ' , Physical Review Letters , vol. 125 , no. 15 , 152001 . https://doi.org/10.1103/PhysRevLett.125.152001

Title: Observation of the B-s(0) -> X(3872)phi Decay
Author: The CMS collaboration; Eerola, P.; Forthomme, L.; Kirschenmann, H.; Osterberg, K.; Voutilainen, M.; Brucken, E.; Garcia, F.; Havukainen, J.; Kim, M.; Kinnunen, R.; Lampen, T.; Lassila-Perini, K.; Laurila, S.; Lehti, S.; Linden, T.; Siikonen, H.; Tuominen, E.; Tuominiemi, J.; Luukka, P.; Viinikainen, J.; Karimäki, V.; Tuuva, T.; Sirunyan, A. M.
Contributor: University of Helsinki, Department of Physics
University of Helsinki, Department of Physics
University of Helsinki, Department of Physics
University of Helsinki, Department of Physics
University of Helsinki, Department of Physics
University of Helsinki, Helsinki Institute of Physics
University of Helsinki, Helsinki Institute of Physics
University of Helsinki, Helsinki Institute of Physics
University of Helsinki, Helsinki Institute of Physics
University of Helsinki, Helsinki Institute of Physics
University of Helsinki, Helsinki Institute of Physics
University of Helsinki, Helsinki Institute of Physics
University of Helsinki, Helsinki Institute of Physics
University of Helsinki, Helsinki Institute of Physics
University of Helsinki, Helsinki Institute of Physics
University of Helsinki, Helsinki Institute of Physics
University of Helsinki, Helsinki Institute of Physics
University of Helsinki, Helsinki Institute of Physics
University of Helsinki, University of Illinois, Chicago
University of Helsinki, Helsinki Institute of Physics
Date: 2020-10-07
Language: eng
Number of pages: 18
Belongs to series: Physical Review Letters
ISSN: 0031-9007
URI: http://hdl.handle.net/10138/322612
Abstract: Using a data sample of proton-proton collisions at root s = 13 TeV, corresponding to an integrated luminosity of 140 fb(-1) collected by the CMS experiment in 2016-2018, the B-s(0) -> X(3872)phi decay is observed. Decays into J/psi pi(+)pi(-) and K+K- are used to reconstruct, respectively, the X(3872) and phi. The ratio of the product of branching fractions B[B-s(0) -> X(3872)phi]B[X(3872) -> J/psi pi(+)pi(-)] to the product B[B-s(0) ->psi(2S)phi]B[psi(2S) -> J/psi pi(+)pi(-)] is measured to be [2.21 +/- 0.29(stat) +/- 0.17(syst)]%. The ratio B[B-s(0) -> X(3872)phi]/B[B-0 -> X(3872)K-0] is found to be consistent with one, while the ratio B[B-s(0) -> X(3872)phi]/B[B+-> X(3872)K+] is two times smaller. This suggests a difference in the production dynamics of the X(3872) in B-0 and B(0)s meson decays compared to B+. The reported observation may shed new light on the nature of the X(3872) particle.
Subject: 114 Physical sciences
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