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Measurement of b hadron production fractions in 7 TeV pp collisions

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Original languageEnglish
Pages (from-to)032008
Number of pages1
JournalPhysical Review D
VolumeD85
Early online date9 Nov 2011
DOIs
Publication statusPublished - 24 Feb 2012

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 fs/(fu+fd) and Λ0b baryon to light B meson production fΛb/(fu+fd) as a function of the charmed hadron-muon pair transverse momentum pT and the b hadron pseudorapidity η, for pT between 0 and 14 GeV and η between 2 and 5. We find that fs/(fu+fd) is consistent with being independent of pT and η, and we determine fs/(fu+fd) = 0.134± 0.004 +0.011−0.010, where the first error is statistical and the second systematic. The corresponding ratio fΛb/(fu+fd) is found to be dependent upon the transverse momentum of the charmed hadron-muon pair, fΛb/(fu+fd)=(0.404±0.017(stat)±0.027(syst)±0.105(Br))×[1−(0.031±0.004(stat)±0.003(syst))×pT(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}.

ID: 3944302