Study of the kinematic dependences of Λ [0 over b] production in pp collisions and a measurement of the Λ [0 over b] → Λ [+ over c] π[superscript −] branching fraction
Author(s)LHCb collaboration; Counts, Ian Thomas Hunt; Ilten, Philip James; Williams, M.
Study of the kinematic dependences of Λ b 0 production in pp collisions and a measurement of the Λ b 0 → Λ c + π − branc
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The kinematic dependences of the relative production rates, fΛ[0 over b]/fd , of Λ [0 over b] baryons and B 0 mesons are measured using Λ [0 over b] → Λ [+ over c] π − and B¯¯0 →D+π− 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 fΛ0b/fd in semileptonic decays, the branching fraction ℬ(Λ [0 over b] → Λ [+ over c] π −) = (4.30 ± 0.03 − 0.11 + 0.12 ± 0.26 ± 0.21) × 10− 3 is obtained, where the first uncertainty is statistical, the second is systematic, the third is from the previous LHCb measurement of fΛ0b/fd and the fourth is due to the b B¯¯0 →D+π− branching fraction. This is the most precise measurement of a Λ [0 over b] branching fraction to date.
DepartmentMassachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Laboratory for Nuclear Science
Journal of High Energy Physics
Springer-Verlag Berlin Heidelberg
Aaij, R., B. Adeva, M. Adinolfi, A. Affolder, Z. Ajaltouni, J. Albrecht, F. Alessio, et al. “Study of the kinematic dependences of Λ [0 over b] production in pp collisions and a measurement of the Λ [0 over b] → Λ [+ over c] π[superscript −] branching fraction.” J. High Energ. Phys. 2014, no. 8 (August 2014).
Final published version