Measurement of ratios of fragmentation fractions for bottom hadrons in pp¯ collisions at s=1.96TeV

T. Aaltonen et al. (CDF Collaboration)
Phys. Rev. D 77, 072003 – Published 17 April 2008

Abstract

This paper describes the first measurement of b-quark fragmentation fractions into bottom hadrons in Run II of the Tevatron Collider at Fermilab. The result is based on a 360pb1 sample of data collected with the CDF II detector in pp¯ collisions at s=1.96TeV. Semileptonic decays of B¯0, B, and B¯s0 mesons, as well as Λb0 baryons, are reconstructed. For an effective bottom hadron pT threshold of 7GeV/c, the fragmentation fractions are measured to be fu/fd=1.054±0.018(stat)0.045+0.025(sys)±0.058(B), fs/(fu+fd)=0.160±0.005(stat)0.010+0.011(sys)0.034+0.057(B), and fΛb/(fu+fd)=0.281±0.012(stat)0.056+0.058(sys)0.087+0.128(B), where the uncertainty B is due to uncertainties on measured branching ratios. The value of fs/(fu+fd) agrees within one standard deviation with previous CDF measurements and the world average of this quantity, which is dominated by LEP measurements. However, the ratio fΛb/(fu+fd) is approximately twice the value previously measured at LEP. The approximately 2σ discrepancy is examined in terms of kinematic differences between the two production environments.

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  • Received 28 January 2008

DOI:https://doi.org/10.1103/PhysRevD.77.072003

©2008 American Physical Society

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Vol. 77, Iss. 7 — 1 April 2008

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