Observation of B ( s ) 0 → J / ψ p p ¯ Decays and Precision Measurements of the B ( s ) 0 Masses

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Observation of B ( s ) 0 → J / ψ p p ¯ Decays and Precision Measurements of the B ( s ) 0 Masses

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PhysRevLett.122.191804.pdf

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Date Issued

2019

Journal

Physical Review Letters

Publisher

American Physical Society (APS)

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Final published version

Abstract

© 2019 CERN, for the LHCb Collaboration. American Physical Society. The first observation of the decays B(s)0→J/ψpp is reported, using proton-proton collision data corresponding to an integrated luminosity of 5.2 fb-1, collected with the LHCb detector. These decays are suppressed due to limited available phase space, as well as due to Okubo-Zweig-Iizuka or Cabibbo suppression. The measured branching fractions are B(B0→J/ψpp)=[4.51±0.40(stat)±0.44(syst)]×10-7, B(Bs0→J/ψpp)=[3.58±0.19(stat)±0.39(syst)]×10-6. For the Bs0 meson, the result is much higher than the expected value of O(10-9). The small available phase space in these decays also allows for the most precise single measurement of both the B0 mass as 5279.74±0.30(stat)±0.10(syst) MeV and the Bs0 mass as 5366.85±0.19(stat)±0.13(syst) MeV.

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https://hdl.handle.net/1721.1/133798

DOI of Published Version

10.1103/PHYSREVLETT.122.191804