Publication
Title
Measurement of ratios of fragmentation fractions for bottom hadrons in $p\overline{p}$ collisions at $\sqrt{s}$=1.96 TeV
Author
Institution/Organisation
CDF Collaboration
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 pp̅ collisions at √s=1.96  TeV. Semileptonic decays of B̅ 0, B-, and B̅ s0 mesons, as well as Λb0 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)-0.045+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.
Language
English
Source (journal)
Physical review : D : particles and fields. - Lancaster, Pa, 1970 - 2003
Publication
Lancaster, Pa : 2008
ISSN
0556-2821
Volume/pages
77:7(2008), p. 072003,1-072003,31
ISI
000255457800006
Full text (Publisher's DOI)
Full text (open access)
UAntwerpen
 Faculty/Department Research group [E?say:metaLocaldata.cgzprojectinf] Publication type Subject Affiliation Publications with a UAntwerp address