Jet Fragmentation Studies at Tevatron
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Release | : 2000 |
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Release | : 2000 |
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Author | : Sergo Jindariani |
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Total Pages | : 3 |
Release | : 2006 |
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Presented are the latest results of jet fragmentation studies at the Tevatron using the CDF Run II detector. Studies include the distribution of transverse momenta (Kt) of particles jets, two-particle momentum correlations, and indirectly global event shapes in p{bar p} collisions. Results are discussed within the context of recent Next-to-Leading Log calculations as well as earlier experimental results from the Tevatron and e{sup +}e{sup -} colliders.
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Total Pages | : 8 |
Release | : 1997 |
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Preliminary CDF results on inclusive momentum distributions of charged particles in high transverse momentum jets produced in {anti p}p collisions at (square root)s=1.8 TeV at the Tevatron are presented and compared with QCD predictions based on the Modified Leading Log Approximation.
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Release | : 2002 |
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In this paper, the most recent results on jet fragmentation obtained at the Collider Detector at Fermilab Tevatron are presented. The multiplicity and momentum distribution of charged particles inside jets in dijet events are compared to the predictions of the Modified Leading Log Approximation complemented with the hypothesis of Local Parton-Hadron Duality. Values for the two parameters of the model are extracted, the cut-off scale Q{sub eff} = 230 ± 40 MeV and the rate of parton-to-hadron conversions K{sub LPHD}{sup charged} = 0.56 ± 0.10. A fit of the data for the ratio of multiplicities in gluon and quark jets r, where r is treated as a free parameter, results in r = 1.9 ± 0.5. Also, we compare the charged particle multiplicities in dijet and [gamma]-jet events. The comparison allows for an extraction of a model-independent ratio of multiplicities in gluon and quark jets. We report r = N{sub g}/N{sub q} = 1.61 ± 0.11(stat) ± 0.28(syst) for E{sub jet} = 40 GeV.
Author | : Alison Lister |
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Total Pages | : 4 |
Release | : 2005 |
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Experimental tests of QCD processes, in particular fragmentation, underlying event and jet shape studies, are not only essential in their own right to allow an improved understanding of the theoretical models and their limitations but they are also important in searches for new physics. Recent results of such tests are presented here. All the results show good agreement between the latest theoretical models or Monte Carlo predictions.
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Release | : 2001 |
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At the Fermilab Tevatron energies, ((square root) s=1800 GeV and (square root) s = 630 GeV), jet production is the dominant process. During the period 1992-1996, the D0 and CDF experiments accumulated almost 100 pb−1 of data and performed the most accurate jet production measurements up to this date. These measurements and the NLO-QCD theoretical predictions calculated during the last decade, have improved our understanding of QCD, our knowledge of the proton structure, and pushed the limit to the scale associated with quark compositeness to 2.4-2.7 TeV. In this paper, we present the most recent published and preliminary measurements on jet production and fragmentation by the D0 and CDF collaborations.
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Total Pages | : 14 |
Release | : 1667 |
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Author | : Sergo Jindariani |
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Total Pages | : 3 |
Release | : 2006 |
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Presented are the measurements of two-particle momentum correlations in jets produced in p-pbar collisions at center of mass frame energy 1.96 TeV. Studies were performed for charged particles within a restricted opening angle of 0.5 rad around the jet axis and for dijet events with various dijet masses. Comparison of the experimental results to the theoretical predictions obtained for partons within the framework of the resummed perturbative QCD (Next-to-Leading Log Approximation) shows that the parton momentum correlations do survive the hadronization stage of jet fragmentation, thus, giving further support to the hypothesis of Local Parton-Hadron Duality.
Author | : Olga Norniella |
Publisher | : |
Total Pages | : 156 |
Release | : 2008-09-01 |
Genre | : Science |
ISBN | : 9783836486255 |
Quantum Chromodynamics (QCD) is the gauge theory that governs the strong interactions between quarks and gluons inside hadrons like, for example, protons and neutrons. At the Tevatron at Fermilab, protons and antiprotons collide at very high energy. In those collisions, collimated jets of hadrons are produced along the direction of struck quarks and gluons in the final state. The measurement of the inclusive jet production cross section for central jets constitutes one of the cornerstones of the jet physics program since it provides a stringent test of pQCD predictions over almost nine orders of magnitude. This Doctoral Thesis presents a measurement of the inclusive jet production cross section using the data collected by the CDF experiment in Run II. The longitudinally invariant Kt algorithm, infrared safe to all orders in pQCD, has been used in order to search for jets in the final state. This measurement is compared to pQCD NLO calculations where non-perturbative effects from the underlying event and the fragmentation of partons into jets of hadrons have been taken into account.
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Total Pages | : 112 |
Release | : 1989 |
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Jet fragmentation properties have been studied in collisions of protons and antiprotons at a center-of-mass energy of 1.8 TeV, using the Collider Detector at Fermilab (CDF). The fractional momentum distribution of charged particles within jets is presented and compared with Monte-Carlo predictions. With increasing di-jet invariant mass from 60 to 200 GeV/c2 the fragmentation is observed to soften as predicted by scale breaking effects in Quantum Chromodynamics (QCD). The charged multiplicity in the jet core is observed to rise with di-jet invariant mass. 57 refs.