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Paper

Measurement of b hadron production fractions in 7 TeV pp collisions

Abstract

Measurements of hadron production ratios in proton-proton collisions at a centre-of-mass energy of 7 TeV with an integrated luminosity of 3 pb are presented. We study the ratios of strange meson to light meson production and baryon to light meson production as a function of the charmed hadron-muon pair transverse momentum and the hadron pseudorapidity , for between 0 and 14 GeV and between 2 and 5. We find that is consistent with being independent of and , and we determine = 0.134 0.004 , where the first error is statistical and the second systematic. The corresponding ratio is found to be dependent upon the transverse momentum of the charmed hadron-muon pair, , where Br reflects an absolute scale uncertainty due to the poorly known branching fraction Br(Λ_c^+ \to pK^-π^+)BBf_s/f_d\bar{B}_s \to D_S^+ π^-\bar{B}^0 \to D^+K^-\bar{B}^0 \to D^+π^-f_s/f_d=0.267^{+0.021}_{-0.020}$.