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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 | : 2000 |
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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.
| Author | : Mario Martinez |
| Publisher | : |
| Total Pages | : 11 |
| Release | : 2005 |
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The Run II at the Tevatron will define a new level of precision for QCD studies in hadron collisions. Both collider experiments, CDF and D0, expect to collect up to 8 fb{sup -1} of data in this new run period. The increase in instantaneous luminosity, center-of-mass energy (from 1.8 TeV to 2 TeV) and the improved acceptance of the detectors will allow stringent tests of the Standard Model (SM) predictions in extended regions of jet transverse momentum, P{sub T}{sup jet}, and jet rapidity, Y{sup jet}. The hadronic final states in hadron-hadron collisions are characterized by the presence of soft contributions (the so-called underlying event) from initial-state gluon radiation and multiple parton interactions between remnants, in addition to the jets of hadrons originated by the hard interaction. A proper comparison with pQCD predictions at the parton level requires an adequate modeling of these soft contributions which become important at low P{sub T}{sup jet}. In this letter, a review of some of the most important QCD results from Run II is presented.
| Author | : Bradley Hubbard |
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| Total Pages | : 246 |
| Release | : 1989 |
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| Author | : Monica D'Onofrio |
| Publisher | : |
| Total Pages | : 12 |
| Release | : 2006 |
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The RunII physics program at the Tevatron started in spring 2001 with protons and antiprotons colliding at an energy of {radical}s = 1.96 TeV. More than 1 fb{sup -1} of data have been collected by both the CDF and D0 experiments. In this contribution, some of the new QCD results are presented.
| Author | : J. Thanh Van Tran |
| Publisher | : Atlantica Séguier Frontières |
| Total Pages | : 690 |
| Release | : 1997 |
| Genre | : Technology & Engineering |
| ISBN | : 9782863322253 |
| Author | : Sergo Jindariani |
| Publisher | : |
| 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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| 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 | : Albert De Roeck |
| Publisher | : World Scientific |
| Total Pages | : 778 |
| Release | : 1998-07-22 |
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| ISBN | : 9814545120 |
This book constitutes the proceedings of the XVIII International Symposium on Lepton-Photon Interactions. It contains 30 review papers on the latest developments by experts in the field. The subjects cover the structure of photons and hadrons, progress in QCD and diffraction, heavy quark (c, b, t) physics, electroweak precision measurements and tests, CP violation, neutrino physics, searches for new particles and phenomena, cosmology, progress in theory and physics at future colliders.
