The kinematic dependences of the relative production rates, (formula presented), of Λ 0 b baryons and B 0 mesons are measured using Λ 0 b → Λ c + π − and (formula presented) decays. The measurements use proton-proton collision data, corresponding to an integrated luminosity of 1 fb −1 at a centre-of-mass energy of 7 TeV, recorded in the forward region with the LHCb experiment. The relative production rates are observed to depend on the transverse momentum, p T, and pseudorapidity, η, of the beauty hadron, in the studied kinematic region 1.5 < p T < 40 GeV/c and 2 < η < 5. Using a previous LHCb measurement of (formula presented) in semileptonic decays, the branching fraction (formula presented) is obtained, where the first uncertainty is statistical, the second is systematic, the third is from the previous LHCb measurement of (formula presented) and the fourth is due to the (formula presented) branching fraction. This is the most precise measurement of a Λ b 0 branching fraction to date.
Bibliographical noteFunding Information:
Both of the authors conceived the theme, wrote the manuscript, and shared responsibility for the final content. MSF has served as principal investigator or co-investigator on NIH grants examining the growth and development of high-risk infants, parental feeding practices, and obesity prevention. JBH had no conflicts to report.
© CERN, for the benefit of the LHCb Collaboration.
All Science Journal Classification (ASJC) codes
- Nuclear and High Energy Physics