Measurement of $b$-hadron production fractions in $7~\rm{TeV}$ pp collisions

Aaij, R.; Abellan Beteta, C.; Adeva, B.; Adinolfi, M.; Adrover, C.; Affolder, A.; Ajaltouni, Z.; Albrecht, J.; Alessio, F.; Alexander, M.

doi:10.1103/PhysRevD.85.032008

Measurement of $b$ -hadron production fractions in $7~\rm{TeV}$ pp collisions

LHCb

Collaboration

Nov, 2011

28 pages

Published in:

Phys.Rev.D 85 (2012) 032008

Published: 2012

e-Print:

1111.2357 [hep-ex]

DOI:

10.1103/PhysRevD.85.032008

PDG:

{{\overline{\mathit b}}}

\rightarrow

{{\mathit B}^{+}}

Report number:

CERN-PH-EP-2011-172,
LHCB-PAPER-2011-018

Experiments:

CERN-LHC-LHCb

View in:

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reference search338 citations

Citations per year

Abstract:

Measurements of

b

hadron production ratios in proton-proton collisions at a centre-of-mass energy of 7 TeV with an integrated luminosity of 3 pb

^{-1}

are presented. We study the ratios of strange

B

meson to light

B

meson production

f_s/(f_u+f_d)

and

\Lambda_b^0

baryon to light

B

meson production

f_{\Lambda_b}/(f_u+f_d)

as a function of the charmed hadron-muon pair transverse momentum

p_T

and the

b

hadron pseudorapidity

\eta

, for

p_T

between 0 and 14 GeV and

\eta

between 2 and 5. We find that

f_s/(f_u+f_d)

is consistent with being independent of

p_{\rm T}

and

\eta

, and we determine

f_s/(f_u+f_d)

= 0.134

\pm

0.004

^{+0.011}_{-0.010}

, where the first error is statistical and the second systematic. The corresponding ratio

f_{\Lambda_b}/(f_u+f_d)

is found to be dependent upon the transverse momentum of the charmed hadron-muon pair,

f_{\Lambda_b}/(f_u+f_d)=(0.404\pm 0.017 (stat) \pm 0.027 (syst) \pm 0.105 (Br))

\times

[1 -(0.031 \pm 0.004 (stat) \pm 0.003 (syst))\times p_T(GeV)]

, where Br reflects an absolute scale uncertainty due to the poorly known branching fraction

Br(\Lambda_c^+ \to pK^-\pi^+)

. We extract the ratio of strange

B

meson to light neutral

B

meson production

f_s/f_d

by averaging the result reported here with two previous measurements derived from the relative abundances of

\bar{B}_s \to D_S^+ \pi ^-

to

\bar{B}^0 \to D^+K^-

and

\bar{B}^0 \to D^+\pi^-

. We obtain

f_s/f_d=0.267^{+0.021}_{-0.020}

.

14.20.Mr
13.25.Hw
p p: inclusive reaction
bottom particle: hadroproduction
bottom particle: semileptonic decay
B/s0
B-
B0
Lambda/b0
yield: ratio: measured

References(20)

Figures(12)

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Measurement of bbb-hadron production fractions in 7 TeV7~\rm{TeV}7 TeV pp collisions

Citations per year

Measurement of $b$ -hadron production fractions in $7~\rm{TeV}$ pp collisions