TY - JOUR
AU - LHCb Collaboration (Aaij, R. et al
AU - Henry, L.
AU - Jashal, B. K.
AU - Martinez-Vidal, F.
AU - Oyanguren, A.
AU - Remon Alepuz, C.
AU - Ruiz Vidal, J.
PY - 2021
DA - 2021//
TI - Observation of the decay Lambda b0 -> chi(c1)p pi(-)
T2 - J. High Energy Phys.
JO - Journal of High Energy Physics
SP - 095
EP - 21pp
VL - 05
IS - 5
PB - Springer
KW - B physics
KW - Branching fraction
KW - Hadron-Hadron scattering (experiments)
KW - QCD
KW - Quarkonium
AB - The Cabibbo-suppressed decay Lambda b0-> chi (c1)p(-) is observed for the first time using data from proton-proton collisions corresponding to an integrated luminosity of 6 fb(-1), collected with the LHCb detector at a centre-of-mass energy of 13 TeV. Evidence for the Lambda b0-> chi (c2)p(-) decay is also found. Using the Lambda b0-> chi (c1)pK(-) decay as normalisation channel, the ratios of branching fractions are measured to be
where the first uncertainty is statistical, the second is systematic and the third is due to the uncertainties in the branching fractions of chi (c1,2)-> J/psi gamma decays.