2008/01/28 by T. Aaltonen, CDF Collaboration, J. Adelman +99 · 45 citations
Physics and Astronomy · #Baryon #Branching fraction #Collider Detector at Fermilab #Hadron #High-Energy Particle Collisions Research #Lambda #Particle physics #Particle physics theoretical and experimental studies #Physics #Quantum Chromodynamics and Particle Interactions #Tevatron #hep-ex #hep-ph
paper · pdf · open access · doi:10.1103/physrevd.77.072003
published in Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D. Particles and fields 77(7) (American Physical Society) · Submitted to PRD, 54 pages, 53 plots
arxiv created 2008/01/28 · openalex publication_date 2008/04/17 · arxiv updated 2010/05/12 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
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^\ensuremath-1 sample of data collected with the CDF II detector in pp collisions at √(s)=1.96 TeV. Semileptonic decays of B0, B^\ensuremath-, and Bs0 mesons, as well as \ensuremathΛb0 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\ifmmode±\else\textpm\fi0.018(stat)_\ensuremath-0.045+0.025(sys)\ifmmode±\else\textpm\fi0.058(B), fs/(fu+fd)=0.160\ifmmode±\else\textpm\fi0.005(stat)_\ensuremath-0.010+0.011(sys)_\ensuremath-0.034+0.057(B), and f_\ensuremathΛb/(fu+fd)=0.281\ifmmode±\else\textpm\fi0.012(stat)_\ensuremath-0.056+0.058(sys)_\ensuremath-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 f_\ensuremathΛb/(fu+fd) is approximately twice the value previously measured at LEP. The approximately 2\ensuremathσ discrepancy is examined in terms of kinematic differences between the two production environments.