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Measurement of b hadron production fractions in 7 TeV pp collisions
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LHCb Collaboration (Including: Back, J. J., Dossett, D., Gershon, T. J., Harrison, P. F., Kreps, Michal, Latham, Thomas, Pilar, T., Poluektov, Anton, Reid, Matthew M., Whitehead, M. (Mark) and Williams, M. P.). (2012) Measurement of b hadron production fractions in 7 TeV pp collisions. Physical Review D (Particles, Fields, Gravitation and Cosmology), Vol.85 (No.3). 032008. doi:10.1103/PhysRevD.85.032008 ISSN 1550-7998.
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WRAP_Back_Measurement_b_hadron.pdf - Published Version Available under License Creative Commons Attribution. Download (857Kb) |
Official URL: http://dx.doi.org/10.1103/PhysRevD.85.032008
Abstract
Measurements of b hadron production ratios in proton-proton collisions at a center-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 Λb0 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±0.004-0.010+0.011, 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 B(Λc+→pK-π+). We extract the ratio of strange B meson to light neutral B meson production fs/fd by averaging the result reported here with two previous measurements derived from the relative abundances of B̅ s0→Ds+π- to B̅ 0→D+K- and B̅ 0→D+π-. We obtain fs/fd=0.267-0.020+0.021.
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