2 research outputs found
Comparison of three-jet events in p(p)over-bar collisions at root s=1.8 TeV to predictions from a next-to-leading order QCD calculation
The properties of three-jet events with total transverse energy greater than 320 GeV and individual jet energy greater than 20 GeV have been analyzed and compared to absolute predictions from a next-to-leading order (NLO) perturbative QCD calculation. These data, of integrated luminosity 86 pb -1, were recorded by the CDF Experiment for pp collisions at âs = 1.8 TeV This study tests a model of higher order QCD processes that result in gluon emission and may give some indication of the magnitude of the contribution of processes higher than NLO. The total cross section is measured to be 466 ± 3(stat.)-70+207(syst.) pb. The differential cross section is furthermore measured for all kinematically accessible regions of the Dalitz plane, including those for which the theoretical prediction is unreliable. While the measured cross section is consistent with the theoretical prediction in magnitude, the two differ somewhat in shape in the Dalitz plane. © 2005 The American Physical Society
K-S(0) and Lambda(0) production studies in p(p)over-bar collisions at root s=1800 and 630 GeV
We present a study of the production of K_s^0 and Lambda^0 in inelastic
pbar-p collisions at sqrt(s)= 1800 and 630 GeV using data collected by the CDF
experiment at the Fermilab Tevatron. Analyses of K_s^0 and Lambda^0
multiplicity and transverse momentum distributions, as well as of the
dependencies of the average number and of K_s^0 and Lambda^0 on charged
particle multiplicity are reported. Systematic comparisons are performed for
the full sample of inelastic collisions, and for the low and high momentum
transfer subsamples, at the two energies. The p_T distributions extend above 8
GeV/c, showing a higher than previous measurements. The dependence of the
mean K_s^0(Lambda^0) p_T on the charged particle multiplicity for the three
samples shows a behavior analogous to that of charged primary tracks.Comment: 47 pages, 20 figures, to be submitted to Phys.Rev.