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Title: Observation of B$^0$$$$\to$$$$\psi$$(2S)K$$^0_\mathrm{S}\pi^+\pi^-$$ and B$$^0_\mathrm{S}$$$$\to$$$$\psi$$(2S)K$$^0_\mathrm{S}$$ decays

Journal Article · · European Physical Journal. C, Particles and Fields (Online)
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Using a data sample of $$\sqrt{s} =$$ 13 TeV proton-proton collisions collected by the CMS experiment at the LHC in 2017 and 2018 with an integrated luminosity of 103 fb$$^{-1}$$, the B$^0$$$$\to$$$$\psi$$(2S)K$$^0_\mathrm{S}$$ and B$$^0_\mathrm{S}$$$$\to$$$$\psi$$(2S)K$$^0_\mathrm{S}\pi^+\pi^-$$ decays are observed with significances exceeding 5 standard deviations. The resulting branching fraction ratios, measured for the first time, correspond to $$\mathcal{B}$$(B$$^0_\mathrm{S}$$$$\to$$$$\psi$$(2S)K$$^0_\mathrm{S}$$) / $$\mathcal{B}$$(B$^0$$$$\to$$$$\psi$$(2S)K$$^0_\mathrm{S}$$) = (3.33 $$\pm$$ 0.69 (stat) $$\pm$$ 0.11 (syst) $$\pm$$ 0.34 ($$f_\mathrm{s} / f_\mathrm{d}$$)) $$\times$$ 10$$^{-2}$$ and $$\mathcal{B}$$(B$^0$$$$\to$$$$\psi$$(2S)K$$^0_\mathrm{S}\pi^+\pi^-$$) / $$\mathcal{B}$$(B$^0$$$$\to$$$$\psi$$(2S)K$$^0_\mathrm{S}$$) = 0.480 $$\pm$$ 0.013 (stat) $$\pm$$ 0.032 (syst), where the last uncertainty in the first ratio is related to the uncertainty in the ratio of production cross sections of B$$^0_\mathrm{s}$$ and B$^0$ mesons, $$f_\mathrm{s} / f_\mathrm{d}$$.

Research Organization:
Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States); Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), High Energy Physics (HEP)
Contributing Organization:
CMS Collaboration
Grant/Contract Number:
AC02-07CH11359; AC02-05CH11231
OSTI ID:
1843253
Alternate ID(s):
OSTI ID: 1894631
Report Number(s):
CMS-BPH-18-004; CERN-EP-2021-271; FERMILAB-CONF-22-047-CMS; arXiv:2201.09131; oai:inspirehep.net:2016388; TRN: US2302261
Journal Information:
European Physical Journal. C, Particles and Fields (Online), Vol. 82, Issue 5; ISSN 1434-6052
Publisher:
Springer NatureCopyright Statement
Country of Publication:
United States
Language:
English

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