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

Aaij, R.; Adeva, B.; Adinolfi, M.; Affolder, A.; Ajaltouni, Z.; Albrecht, J.; Alessio, F.; Alexander, M.; Ali, S.; Alkhazov, G.

doi:10.1007/JHEP08(2014)143

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

LHCb

Collaboration

May 27, 2014

19 pages

Published in:

JHEP 08 (2014) 143

Published: 2014

e-Print:

1405.6842 [hep-ex]

DOI:

10.1007/JHEP08(2014)143

PDG:

{{\mathit \Lambda}_{{{b}}}^{0}}

\rightarrow

{{\mathit \Lambda}_{{{c}}}^{+}}{{\mathit \pi}^{-}}

Report number:

CERN-PH-EP-2014-106,
LHCB-PAPER-2014-004

Experiments:

CERN-LHC-LHCb

View in:

reference search124 citations

Citations per year

Abstract: (arXiv)

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 \rightarrow \Lambda_c^+ \pi^-

and

\bar{B}^0 \rightarrow 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 \rightarrow \Lambda_c^+ \pi^-) = \Big( 4.30 \pm 0.03 \,\, ^{+0.12}_{-0.11} \pm 0.26 \pm 0.21 \Big) \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 \rightarrow D^+ \pi^-

branching fraction. This is the most precise measurement of a

\Lambda_b^0

branching fraction to date.

Note:

v2 as published

Hadron-Hadron Scattering
B physics
Heavy quark production
Branching fraction
Particle and resonance production
p p: scattering
Lambda/b0: branching ratio: measured
LHC-B
transverse momentum dependence
rapidity dependence

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Study of the kinematic dependences of Λb0\Lambda_{b}^{0}Λb0​ production in pp collisions and a measurement of the Λb0→Λc+\Lambda_{b}^{0} \to \Lambda_{c}^{+}Λb0​→Λc+​ π−\pi^{-}π− branching fraction

Citations per year

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