Limits on quark compositeness from high energy jets in p̄p collisions at 1.8 TeV
Physical Review D - Particles, Fields, Gravitation and Cosmology 62:3 (2000) 1-6
Abstract:
Events in p̄p collisions at √s= 1.8 TeV with total transverse energy exceeding 500 GeV are used to set limits on quark substructure. The data are consistent with next-to-leading order QCD calculations. We set a lower limit of 2.0 TeV at 95% confidence on the energy scale ΛLL for compositeness in quarks, assuming a model with a left-left isoscalar contact interaction term. The limits on ΛLL are found to be insensitive to the sign of the interference term in the Lagrangian. ©2000 The American Physical Society.Spin correlation in tt̄ production from pp̄ collisions at √s = 1.8 TeV
Physical Review Letters 85:2 (2000) 256-261
Abstract:
An analytical study was carried out to account for spin correlation effects in the production of tt̄ pairs in pp̄ collisions at √s=1.8 TeV. It was found that κ > -0.25 at the 68% confidence level.Small-angle muon and bottom-quark production in pp̄ collisions at √s = 1.8 TeV
Physical Review Letters 84:24 (2000) 5478-5483
Abstract:
The inclusive muon cross section, and the cross section for mouns originating from b quark decay, in the forward rapidity region of 2.4 < | ymu | < 3.2 were measured in this study. It was found that next-to-leading order QCD calculations underestimate b quark production by a factor of 4 in this region.Measurement of the W-->taunu production cross section in pp collisions at square root s=1.8 TeV.
Physical review letters 84:25 (2000) 5710-5715
Abstract:
We report on a measurement of sigma(pp-->W+X)B(W-->taunu) in pp collisions at sqrt[s]=1.8 TeV at the Fermilab Tevatron. The measurement is based on an integrated luminosity (lum) of 18 pb-1 of data collected with the D0 detector during 1994-1995. We find that sigma(pp-->W+X)B(W-->taunu)=2.22+/-0.09 (stat)+/-0. 10 (syst)+/-0.10 (lum) nb. Lepton universality predicts that the ratio of the tau and electron electroweak charged current couplings to the W boson, gWtau/gWe, be unity. We find gWtau/gWe=0.980+/-0.031, in agreement with lepton universality.Probing Balitsky-Fadin-Kuraev-Lipatov dynamics in the dijet cross section at large rapidity intervals in pp collisions at sqrt[s]=1800 and 630 GeV.
Physical review letters 84:25 (2000) 5722-5727