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

ContributorsCDF Collaboration
Publication date2008
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 360  pb−1 sample of data collected with the CDF II detector in pp collisions at s√=1.96  TeV. Semileptonic decays of B0, B−, and B0s mesons, as well as Λ0b baryons, are reconstructed. For an effective bottom hadron pT threshold of 7  GeV/c, the fragmentation fractions are measured to be fu/fd=1.054±0.018(stat)+0.025−0.045(sys)±0.058(B), fs/(fu+fd)=0.160±0.005(stat)+0.011−0.010(sys)+0.057−0.034(B), and fΛb/(fu+fd)=0.281±0.012(stat)+0.058−0.056(sys)+0.128−0.087(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.

Citation (ISO format)
CDF Collaboration. Measurement of ratios of fragmentation fractions for bottom hadrons in <em>pp</em> collisions at s√=1.96  TeV. In: Physical review. D. Particles, fields, gravitation, and cosmology, 2008, vol. 77, n° 07, p. 072003. doi: 10.1103/PhysRevD.77.072003
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Article (Published version)
accessLevelPublic
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ISSN of the journal1550-2368
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