Branching Fraction Measurements of the Rare Bs0 →φμ+μ- And Bs0 → f2′ (1525)μ+μ- Decays

Roel Aaij,C. Abellán Beteta,Thomas Ackernley,Bernardo Adeva,Marco Adinolfi,Hossein Afsharnia, C. A. Aidala,Salvatore Aiola,Ziad Ajaltouni,Simon Akar,Johannes Albrecht,Federico Alessio,Michael Alexander,A. Alfonso Albero, Zakariya Aliouche, G. Alkhazov,P. Alvarez Cartelle,Sandra Amato,Yasmine Amhis,Liupan An,Lucio Anderlini, Aleksei Andreianov, M. Andreotti, F. Archilli, A. Artamonov,Marina Artuso, Kenenbek Arzymatov,Elie Aslanides,Michele Atzeni,Benjamin Audurier,Sebastian Bachmann,Marie Bachmayer, J. J. Back,P. Baladron Rodriguez,V. Balagura,W. Baldini,J. Baptista Leite,R. J. Barlow,Sergey Barsuk,William Barter,Matteo Bartolini,Fedor Baryshnikov, Jan-Marc Basels,Giovanni Bassi, Baasansuren Batsukh,Alexander Battig, A. Bay,Michael Becker,Franco Bedeschi,Ignacio Bediaga,Andrew Beiter,Vladislav Belavin,Samuel Belin,Violaine Bellee, K. Belous,Ilia Belov,Ivan Belyaev, G. Bencivenni, E. Ben-Haim,Alexander Berezhnoy,Roland Bernet,Daniel Berninghoff, Harris Conan Bernstein,Claudia Bertella,A. Bertolin,Christopher Betancourt,Federico Betti,Ia. Bezshyiko,Srishti Bhasin,Jihyun Bhom, L. Bian,Martin Stefan Bieker,Simone Bifani,Pierre Billoir, Matthew Birch, Fionn Caitlin Ros Bishop,A. Bitadze,Andrea Bizzeti,Mikkel Bjørn,Michele Piero Blago,Thomas Blake,F. Blanc,S. Blusk, Dana Bobulska, Julian Alexander Boelhauve,O. Boente Garcia,Thomas Boettcher,Alexey Boldyrev, A. Bondar,Nikolay Bondar,Silvia Borghi,Maxim Borisyak,Martino Borsato,Jozef Tomasz Borsuk, Sonia Amina Bouchiba,T. J. V. Bowcock,Alexandre Boyer, C. Bozzi, M. J. Bradley,Svende Braun

Physical Review Letters（2021）

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摘要

The branching fraction of the rare B s 0 → ϕ μ + μ - decay is measured using data collected by the LHCb experiment at center-of-mass energies of 7, 8, and 13 TeV, corresponding to integrated luminosities of 1, 2, and 6 fb - 1 , respectively. The branching fraction is reported in intervals of q 2 , the square of the dimuon invariant mass. In the q 2 region between 1.1 and 6.0 GeV 2 / c 4 , the measurement is found to lie 3.6 standard deviations below a standard model prediction based on a combination of light cone sum rule and lattice QCD calculations. In addition, the first observation of the rare B s 0 → f 2 ′ ( 1525 ) μ + μ - decay is reported with a statistical significance of 9 standard deviations and its branching fraction is determined.

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