2018/07/31 by CDF Collaboration, T. Aaltonen, S. Amerio +405 · 1 citation
Mathematics · Physics and Astronomy · #Boson #Branching fraction #Collider Detector at Fermilab #Combinatorics #Energy (signal processing) #Higgs boson #High-Energy Particle Collisions Research #Large Hadron Collider #Mathematics #Particle physics #Particle physics theoretical and experimental studies #Physics #Production (economics) #Quantum Chromodynamics and Particle Interactions #Quantum chromodynamics #Quark #Standard Model (mathematical formulation) #Top quark #hep-ex
paper · pdf · doi:10.1103/physrevd.98.072002
published in Physical review. D/Physical review. D. 98(7) (American Physical Society)
openalex created_date 2018/07/10 · openalex publication_date 2018/10/11 · arxiv created 2018/10/18 · arxiv updated 2018/10/19 · openalex updated_date 2026/08/06
The Collider Detector at Fermilab collected a unique sample of jets originating from bottom-quark fragmentation (b-jets) by selecting online proton-antiproton (pp) collisions with a vertex displaced from the pp interaction point, consistent with the decay of a bottom-quark hadron. This data set, collected at a center-of-mass energy of 1.96 TeV, and corresponding to an integrated luminosity of 5.4 fb^\ensuremath-1, is used to measure the Z-boson production cross section times branching ratio into bb. The number of Z\ensuremath→bb events is determined by fitting the dijet-mass distribution, while constraining the dominant b-jet background, originating from QCD multijet events, with data. The result, \ensuremathσ(pp\ensuremath→Z)\ifmmode×\else\texttimes\fiB(Z\ensuremath→bb)=\phantom\rule0ex0ex1.11\ifmmode±\else\textpm\fi0.08(stat)\ifmmode±\else\textpm\fi0.14(syst) nb, is the most precise measurement of this process, and is consistent with the standard-model prediction. The data set is also used to search for Higgs-boson production. No significant signal is expected in our data and the first upper limit on the cross section for the inclusive pp\ensuremath→H\ensuremath→bb process at √(s)=1.96 TeV is set, corresponding to 33 times the expected standard-model cross section, or \ensuremathσ=40.6 pb, at the 95% confidence level.