• Open Access

Measurement of the mass and production rate of Ξb baryons

R. Aaij et al. (LHCb Collaboration)
Phys. Rev. D 99, 052006 – Published 22 March 2019

Abstract

The first measurement of the production rate of Ξb baryons in pp collisions relative to that of Λb0 baryons is reported, using data samples collected by the LHCb experiment, and corresponding to integrated luminosities of 1, 2 and 1.6fb1 at s=7, 8 and 13 TeV, respectively. In the kinematic region 2<η<6 and pT<20GeV/c, we measure fΞbfΛb0B(ΞbJ/ψΞ)B(Λb0J/ψΛ)=(10.8±0.9±0.8)×102 [s=7,8TeV], fΞbfΛb0B(ΞbJ/ψΞ)B(Λb0J/ψΛ)=(13.1±1.1±1.0)×102 [s=13TeV], where fΞb and fΛb0 are the fragmentation fractions of b quarks into Ξb and Λb0 baryons, respectively; B represents branching fractions; and the uncertainties are due to statistical and experimental systematic sources. The values of fΞb/fΛb0 are obtained by invoking SU(3) symmetry in the ΞbJ/ψΞ and Λb0J/ψΛ decays. Production asymmetries between Ξb and Ξ¯b+ baryons are also reported. The mass of the Ξb baryon is also measured relative to that of the Λb0 baryon, from which it is found that m(Ξb)=5796.70±0.39±0.15±0.17MeV/c2, where the last uncertainty is due to the precision on the known Λb0 mass. This result represents the most precise determination of the Ξb mass.

  • Figure
  • Received 21 January 2019

DOI:https://doi.org/10.1103/PhysRevD.99.052006

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.

© 2019 CERN, for the LHCb Collaboration

Physics Subject Headings (PhySH)

  1. Physical Systems
  1. Properties
Particles & Fields

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Vol. 99, Iss. 5 — 1 March 2019

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