Study of the kinematic dependences of ${\Lambda }_b^0$ production in $pp$ collisions and a measurement of the ${\Lambda }_b^0\to {\Lambda }_c^{+}{\pi }^{-}$ branching fraction

Abstract

The kinematic dependences of the relative production rates, $f_{{\Lambda }_b^0}/f_d$, of ${\Lambda }_b^0$ baryons and ${\bar{B}}^0$ mesons are measured using ${\Lambda }_b^0\to {\Lambda }_c^{+}{\pi }^{-}$ and ${\bar{B}}^0\to D^{+}{\pi }^{-}$ 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, $\eta$, of the beauty hadron, in the studied kinematic region $1.5<p_T<40$ GeV/$c$ and $2<\eta <5$. Using a previous LHCb measurement of $f_{{\Lambda }_b^0}/f_d$ in semileptonic decays, the branching fraction $\mathcal{B}({\Lambda }_b^0\to {\Lambda }_c^{+}{\pi }^{-})=(4.30\pm 0.03{}_{-0.11}^{+0.12}\pm 0.26\pm 0.21)\times 10^{-3}$ is obtained, where the first uncertainty is statistical, the second is systematic, the third is from the previous LHCb measurement of $f_{{\Lambda }_b^0}/f_d$ and the fourth is due to the ${\bar{B}}^0\to D^{+}{\pi }^{-}$ branching fraction. This is the most precise measurement of a ${\Lambda }_b^0$ branching fraction to date.

v2 as published

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• Measurement of the Lambda(b) cross section and the anti-Lambda(b) to Lambda(b) ratio with Lambda(b) to J/Psi Lambda decays in pp collisions at sqrt(s) = 7 TeV
• Measurement of the ${\Xi }_b^{-}$ and ${\Omega }_b^{-}$ baryon lifetimes

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