Study of the heavy flavor content of jets produced in association with W bosons in pp̄ collisions at √s=1.8TeV
Physical Review D - Particles, Fields, Gravitation and Cosmology 65:5 (2002) 520071-5200726
Abstract:
We present a detailed examination of the heavy flavor content of the W+jet data sample collected with the Collider Detector at Fermilab during the 1992-1995 collider run at the Fermilab Tevatron. Jets containing heavy flavor quarks are selected via the identification of secondary vertices or semileptonic decays of b and c quarks. There is generally good agreement between the rates of secondary vertices and soft leptons in the data and in the standard model simulation including single and pair production of top quarks. An exception is the number of events in which a single jet has both a soft lepton and a secondary vertex tag. In W+2,3 jet data, we find 13 such events where we expected 4.4±0.6 events. The kinematic properties of this small sample of events are statistically difficult to reconcile with the simulation of standard model processes.Measurement of the strong coupling constant from inclusive jet production at the Tevatron pp collider.
Phys Rev Lett 88:4 (2002) 042001
Abstract:
We report a measurement of the strong coupling constant, alpha(s)(MZ), extracted from inclusive jet production in pp collisions at square root[s] = 1800 GeV. The QCD prediction for the evolution of alpha(s) with jet transverse energy ET is tested over the range 40Cross section for forward j/ψ production in pp collisions at √s=1.8 tev
Physical Review D - Particles, Fields, Gravitation and Cosmology 66-9 (2002)
Abstract:
The inclusive cross section for J/Ψ production times the branching ratio B(J/Ψ→μ + μ - ) has been measured in the forward pseudorapidity region: B×dσ[p - +p→J/Ψ(p T >10 GeV/c,2.1<|η|<2.6)+X]/dη = 192±9(stat) ±29(syst) pb. The results are based on 74.1±5.2 pb -1 of data collected by the CDF Collaboration at the Fermilab Tevatron Collider. The measurements extend earlier measurements of the D0 Collaboration to higher p TJ/Ψ . In the kinematic range where the experiments partially overlap, these data are in good agreement with previous measurements.Measurement of the B+total cross section and B+differential cross section dσ/dpT in pp̄ collisions at √s=1.8 TeV
Physical Review D 65:5 (2002)
Abstract:
We present measurements of the B+meson total cross section and differential cross section dσ/dpT. The measurements use a 98±4 pb-1sample of pp̄ collisions at √s=1.8 TeV collected by the CDF detector. Charged B meson candidates are reconstructed through the decay B±→J|ψ±with J|ψ→µ+µ-. The total cross section, measured in the central rapidity region |y|<1.0 for pT(B)>6.0 GeV/c, is 3.6±0.6(stat ⊕ syst) µb. The measured differential cross section is substantially larger than typical QCD predictions calculated to next-to-leading order.Measurement of the ratio of b quark production cross sections in pp collisions at √s=630 GeV and √s=1800 GeV
Physical Review D - Particles, Fields, Gravitation and Cosmology 66:3 (2002)