PT Journal
AU LHCb Collaboration (Aaij, Rea
   Garcia Martin, LM
   Martinez-Vidal, F
   Oyanguren, A
   Remon Alepuz, C
   Ruiz Valls, P
   Sanchez Mayordomo, C
TI Observation of the decay Lambda(0)(b) -> pK(-)mu(+)mu(-) and a search for CP violation
SO Journal of High Energy Physics
JI J. High Energy Phys.
PY 2017
BP 108
EP 17pp
VL 06
IS 6
DI 10.1007/JHEP06(2017)108
LA English
DE B physics; CP violation; FCNC Interaction; Hadron-Hadron scattering (experiments)
AB A search for CP violation in the decay Lambda(0)(b) -> pK(-)mu(+)mu(-) 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). The Lambda(0)(b) -> pK(-)mu(+)mu(-) decay is observed for the first time, and two observables that are sensitive to different manifestations of CP violation are measured, Delta A(CP) equivalent to A(CP) (Lambda(0)(b) -> pK(-)mu(+)mu(-)) – A(CP) (Lambda(0)(b) -> pK(-)J/psi) and a(CP)((T) over cap -odd), where the latter is based on asymmetries in the angle between the mu(+)mu(-) and pK(-) decay planes. These are measured to be Delta A(CP) = (-3.5 +/- 5.0 (stat) +/- 0.2 (syst)) x 10(-2), a(CP)((T) over cap -odd) = (1.2 +/- 5.0 (stat) +/- 0.7 (syst)) x 10(-2), and no evidence for CP violation is found.
ER