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Observation of the decay Λb0→pK−μ+μ−\Lambda^0_b \to p K^- \mu^+ \mu^- and a search for C ⁣PC\!P violation

Collaboration
Mar 1, 2017
17 pages
Published in:
  • JHEP 06 (2017) 108
  • Published: Jun 21, 2017
e-Print:
DOI:
Report number:
  • LHCB-PAPER-2016-059,
  • CERN-EP-2017-032
Experiments:
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Abstract: (Springer)
A search for CP violation in the decay Λb0_{b}^{0}  → pK−^{−} μ+^{+} μ−^{−} is presented. This decay is mediated by flavour-changing neutral-current transitions in the Standard Model and is potentially sensitive to new sources of CP violation. The study is based on a data sample of proton-proton collisions recorded with the LHCb experiment, corresponding to an integrated luminosity of 3 fb−1^{−1}. The Λb0_{b}^{0}  → pK−^{−} μ+^{+} μ−^{−} decay is observed for the first time, and two observables that are sensitive to different manifestations of CP violation are measured, ΔACP≡ACP(Λb0→pK−μ+μ−)−ACP(Λb0→pK−J/ψ) \Delta {\mathcal{A}}_{CP}\equiv {\mathcal{A}}_{CP}\left({\Lambda}_b^0\to p{K}^{-}{\mu}^{+}{\mu}^{-}\right)-{\mathcal{A}}_{CP}\left({\Lambda}_b^0\to p{K}^{-}J/\psi \right) and a aCPTundefined-odd {a}_{CP}^{\widehat{T}\hbox{-} odd} , where the latter is based on asymmetries in the angle between the μ+^{+} μ−^{−} and pK−^{−} decay planes.
Note:
  • B physics
  • CP violation
  • FCNC Interaction
  • Hadron-Hadron scattering (experiments)
  • p p: colliding beams
  • Lambda/b0: semileptonic decay
  • muon: pair production
  • neutral current: flavor changing
  • p p: scattering
  • asymmetry: CP
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