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
BLambda b0-> chi c1p pi-BLambda b0-> chi c1pK-=6.59 +/- 1.01 +/- 0.22x10-2,BLambda b0 -> chi c2p pi-BLambda b0 -> chi c1p pi-=0.95 +/- 0.30 +/- 0.04 +/- 0.04,BLambda b0 -> chi c2pK-BLambda b0 -> chi c1pK-=1.06 +/- 0.05 +/- 0.04 +/- 0.04,![]()
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.
Title
Observation of the decay Lambda b0 -> chi(c1)p pi(-)
Published in
Journal Of High Energy Physics
Issue
5
Pages
95
Date
2021-05-12
Publisher
New York, SPRINGER
ISSN
1029-8479
Record creation date
2021-06-19