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(2017)
Observation of the Decays Α<sub>b</sub><SUP>0</SUP> → χ<sub><i>c</i>1</sub><i>pK</i><SUP>-</SUP> and Α<sub>b</sub><SUP>0</SUP> →χ<sub><i>c</i>2</sub><i>pK</i><SUP>-</SUP>.
PHYSICAL REVIEW LETTERS, 119 (6).
062001-.
Abstract
The first observation of the decays Λ_{b}^{0}→χ_{c1}pK^{-} and Λ_{b}^{0}→χ_{c2}pK^{-} is reported using a data sample corresponding to an integrated luminosity of 3.0 fb^{-1}, collected by the LHCb experiment in pp collisions at center-of-mass energies of 7 and 8 TeV. The following ratios of branching fractions are measured: B(Λ_{b}^{0}→χ_{c1}pK^{-})/B(Λ_{b}^{0}→J/ψpK^{-})=0.242±0.014±0.013±0.009,B(Λ_{b}^{0}→χ_{c2}pK^{-})/B(Λ_{b}^{0}→J/ψpK^{-})=0.248±0.020±0.014±0.009,B(Λ_{b}^{0}→χ_{c2}pK^{-})/B(Λ_{b}^{0}→χ_{c1}pK^{-})=1.02±0.10±0.02±0.05,where the first uncertainty is statistical, the second systematic, and the third due to the uncertainty on the branching fractions of the χ_{c1}→J/ψγ and χ_{c2}→J/ψγ decays. Using both decay modes, the mass of the Λ_{b}^{0} baryon is also measured to be m_{Λ_{b}^{0}}=5619.44±0.28±0.26 MeV/c^{2}, where the first and second uncertainties are statistical and systematic, respectively.
Item Type: |
Article
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Additional Information: |
All figures and tables, along with any supplementary material and
additional information, are available at
https://lhcbproject.web.cern.ch/lhcbproject/Publications/LHCbProjectPublic/LHCb-PAPER-2017-011.html |
Uncontrolled Keywords: |
LHCb Collaboration |
Depositing User: |
Symplectic Admin
|
Date Deposited: |
11 Sep 2017 13:23 |
Last Modified: |
13 Oct 2023 15:11 |
DOI: |
10.1103/PhysRevLett.119.062001 |
Related URLs: |
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URI: |
https://livrepository.liverpool.ac.uk/id/eprint/3009395 |