Observation of <i>B</i><sub>(<i>s</i>)</sub><SUP>0</SUP> → <i>J</i>/ψ<i>p</i>(<i>p</i>)over-bar Decays and Precision Measurements of the <i>B</i><sub>(<i>s</i>)</sub><SUP>0</SUP> Masses

Aaij, R, Beteta, C Abellan, Adeva, B, Adinolfi, M, Aidala, CA, Ajaltouni, Z, Akar, S, Albicocco, P, Albrecht, J, Alessio, F
et al (show 839 more authors) (2019) Observation of <i>B</i><sub>(<i>s</i>)</sub><SUP>0</SUP> → <i>J</i>/ψ<i>p</i>(<i>p</i>)over-bar Decays and Precision Measurements of the <i>B</i><sub>(<i>s</i>)</sub><SUP>0</SUP> Masses. PHYSICAL REVIEW LETTERS, 122 (19). 191804-.

Access the full-text of this item by clicking on the Open Access link.


The first observation of the decays B_{(s)}^{0}→J/ψpp[over ¯] 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(B^{0}→J/ψpp[over ¯])=[4.51±0.40(stat)±0.44(syst)]×10^{-7}, B(B_{s}^{0}→J/ψpp[over ¯])=[3.58±0.19(stat)±0.39(syst)]×10^{-6}. For the B_{s}^{0} 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 B^{0} mass as 5279.74±0.30(stat)±0.10(syst)  MeV and the B_{s}^{0} mass as 5366.85±0.19(stat)±0.13(syst)  MeV.

Item Type: Article
Additional Information: All figures and tables, along with any supplementary material and additional information, are available at https://cern.ch/lhcbproject/Publications/p/LHCb-PAPER-2018-046.html
Uncontrolled Keywords: LHCb Collaboration
Depositing User: Symplectic Admin
Date Deposited: 20 May 2019 13:41
Last Modified: 17 Oct 2023 04:05
DOI: 10.1103/PhysRevLett.122.191804
Open Access URL: https://doi.org/10.1103/PhysRevLett.122.191804
Related URLs:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3042182