The kinematic dependences of the relative production rates, fΛ0b/fd, of Λ0b baryons and B¯0 mesons are measured using Λ0b→Λ+cπ− 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, pT, and pseudorapidity, η, of the beauty hadron, in the studied kinematic region 1.5<pT<40 GeV/c and 2<η<5. Using a previous LHCb measurement of fΛ0b/fd in semileptonic decays, the branching fraction (Λ0b→Λ+cπ−)=(4.30±0.03+0.12−0.11±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¯0→D+π− branching fraction. This is the most precise measurement of a Λ0b branching fraction to date.
Study of the kinematic dependences of Λ b 0 production in pp collisions and a measurement of the Λ b 0 → Λ c + π − branching fraction
ANDREOTTI, Mirco;BALDINI, Wander;BOZZI, Concezio;CALABRESE, Roberto;CORVO, Marco;FIORE, Marco;FIORINI, Massimiliano;LUPPI, Eleonora;MANZALI, Matteo;SAVRIE', Mauro;TELLARINI, Giulia;TOMASSETTI, Luca;
2014
Abstract
The kinematic dependences of the relative production rates, fΛ0b/fd, of Λ0b baryons and B¯0 mesons are measured using Λ0b→Λ+cπ− 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, pT, and pseudorapidity, η, of the beauty hadron, in the studied kinematic region 1.5I documenti in SFERA sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
