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The kinematic dependences of the relative production rates, f_Λ0b/f_d, of Λ0b baryons and B0 mesons are measured using Λ0b → Λc+ π− and anti-B0 → 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 f_Λ0b/f_d in semileptonic decays, the branching fraction B(Λ0b → Λc+ 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 f_Λ0b/f_d and the fourth is due to the anti-B0 → D+ π− branching fraction. This is the most precise measurement of a Λ0b branching fraction to date.

R. Aaij, B. Adeva, M. Adinolfi, A. Affolder, Z. Ajaltouni, J. Albrecht, et al. (2014). Study of the Kinematic Dependences of Λ0b Production in pp Collisions and a Measurement of the Λ0b → Λc+ π− Branching Fraction. JOURNAL OF HIGH ENERGY PHYSICS, 2014(8), 0-18 [10.1007/JHEP08(2014)143].

Study of the Kinematic Dependences of Λ0b Production in pp Collisions and a Measurement of the Λ0b → Λc+ π− Branching Fraction

CARBONE, ANGELO;GALLI, DOMENICO;PERAZZINI, STEFANO;VAGNONI, VINCENZO MARIA;ZANGOLI, MARIA;
2014

Abstract

The kinematic dependences of the relative production rates, f_Λ0b/f_d, of Λ0b baryons and B0 mesons are measured using Λ0b → Λc+ π− and anti-B0 → 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 f_Λ0b/f_d in semileptonic decays, the branching fraction B(Λ0b → Λc+ 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 f_Λ0b/f_d and the fourth is due to the anti-B0 → D+ π− branching fraction. This is the most precise measurement of a Λ0b branching fraction to date.
2014
R. Aaij, B. Adeva, M. Adinolfi, A. Affolder, Z. Ajaltouni, J. Albrecht, et al. (2014). Study of the Kinematic Dependences of Λ0b Production in pp Collisions and a Measurement of the Λ0b → Λc+ π− Branching Fraction. JOURNAL OF HIGH ENERGY PHYSICS, 2014(8), 0-18 [10.1007/JHEP08(2014)143].
R. Aaij; B. Adeva; M. Adinolfi; A. Affolder; Z. Ajaltouni; J. Albrecht; F. Alessio; M. Alexander; S. Ali; G. Alkhazov; P. Alvarez Cartelle; A. A. Alve...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/335319
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