Observation of the Ξ − b → J /ψΛK − decay
Author(s)
The LHCb Collaboration; Boettcher, Thomas Julian; Ilten, Philip J; Williams, M.Abstract
© 2017 The Author(s) The observation of the decay Ξb−→J/ψΛK−is reported, using a data sample corresponding to an integrated luminosity of 3fb−1, collected by the LHCb detector in pp collisions at centre-of-mass energies of 7 and 8TeV. The production rate of Ξb−baryons detected in the decay Ξb−→J/ψΛK−is measured relative to that of Λb0baryons using the decay Λb0→J/ψΛ. Integrated over the b-baryon transverse momentum pT<25GeV/c and rapidity 2.0<y<4.5, the measured ratio is [Formula presented][Formula presented]=(4.19±0.29 (stat)±0.15 (syst))×10−2, where fΞb−and fΛb0are the fragmentation fractions of b→Ξb−and b→Λb0transitions, and B represents the branching fraction of the corresponding b-baryon decay. The mass difference between Ξb−and Λb0baryons is measured to be M(Ξb−)−M(Λb0)=177.08±0.47 (stat)±0.16 (syst)MeV/c2.
Date issued
2017-06Department
Massachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Laboratory for Nuclear ScienceJournal
Physics Letters B
Publisher
Elsevier BV
Citation
Aaij, R., B. Adeva, M. Adinolfi, Z. Ajaltouni, S. Akar, J. Albrecht, F. Alessio, et al. “Observation of theΞb−→J/ψΛK−decay.” Physics Letters B 772 (September 2017): 265–273. doi:10.1016/j.physletb.2017.06.045.
Version: Final published version
ISSN
03702693
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