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)) x [1 − (0.031 ± 0.004(stat) ± 0.003(syst)) x pT(GeV)], where Br reflects an absolute scale uncertainty due to the poorly known branching fraction B(Λc+ → p K− π+). 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 anti-B0s → Ds+ π− to anti-B0 → D+ K− and anti-B0 → D+ π−. We obtain f_s/f_d = 0.267(−0.020)(+0.021).

R. Aaij, C. Abellan Beteta, B. Adeva, M. Adinolfi, C. Adrover, A. Affolder, et al. (2012). Measurement of b hadron production fractions in 7 TeV pp collisions. PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY, 85(3), 1-16 [10.1103/PhysRevD.85.032008].

Measurement of b hadron production fractions in 7 TeV pp collisions

CARBONE, ANGELO;GALLI, DOMENICO;PATRIGNANI, CLAUDIA;PERAZZINI, STEFANO;VAGNONI, VINCENZO MARIA;
2012

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)) x [1 − (0.031 ± 0.004(stat) ± 0.003(syst)) x pT(GeV)], where Br reflects an absolute scale uncertainty due to the poorly known branching fraction B(Λc+ → p K− π+). 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 anti-B0s → Ds+ π− to anti-B0 → D+ K− and anti-B0 → D+ π−. We obtain f_s/f_d = 0.267(−0.020)(+0.021).
2012
R. Aaij, C. Abellan Beteta, B. Adeva, M. Adinolfi, C. Adrover, A. Affolder, et al. (2012). Measurement of b hadron production fractions in 7 TeV pp collisions. PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY, 85(3), 1-16 [10.1103/PhysRevD.85.032008].
R. Aaij; C. Abellan Beteta; B. Adeva; M. Adinolfi; C. Adrover; A. Affolder; Z. Ajaltouni; J. Albrecht; F. Alessio; M. Alexander; G. Alkhazov; P. Alvar...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/113203
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