Author: Publisher: ISBN: Category : Languages : en Pages :
Book Description
Presented are the most recent jet fragmentation results from CDF: inclusive distributions of charged particle momenta and their k{sub T} in jets; average track multiplicities, as well as angular distributions of multiplicity flow, for a wide range of jet energies with E{sub T} from 40 to 300 GeV. The results are compared with Monte-Carlo and, when possible, analytical calculations performed in resumed perturbative QCD approximations (MLLA).
Author: Sergo Jindariani Publisher: ISBN: Category : Languages : en Pages : 3
Book Description
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.
Author: Publisher: ISBN: Category : Languages : en Pages :
Book Description
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: Constantin Loizides Publisher: ibidem-Verlag / ibidem Press ISBN: 3838255577 Category : Science Languages : en Pages : 180
Book Description
The ALICE experiment is one of the experiments currently prepared for the Large Hadron Collider (LHC) at CERN, Geneva, starting operation end of 2007. ALICE is dedicated to the research on nucleus-nucleus collisions at ultra-relativistic energies, which addresses the properties of strongly interacting matter under varying conditions of high density and temperature. The conditions provided at the LHC allow significant qualitative improvement with respect to previous studies. In particular, energetic probes, light quarks and gluons, will be abundantly produced. These probes might be identified by their fragmentation into correlated particles, so called jets, of high enough energy to allow full reconstruction of jet properties; even in the underlying heavy-ion environment.Understanding the dependence of high-energy jet production and fragmentation influenced by the dense medium created in the collision region is an open field of active research. Generally, one expects energy loss of the probes due to medium-induced gluon radiation. It is suggested that hadronization products of these, rather soft gluons may be contained within the jet emission cone, resulting in a modification of the characteristic jet fragmentation, as observed via longitudinal and transverse momentum distributions with respect to the direction of the initial parton, as well as of the multiplicity distributions arising from the jet fragmentation. Particle momenta parallel to the jet axis are softened (jet quenching), while transverse to it increased (transverse heating). The present thesis studies the capabilities of the ALICE detectors to measure these jets and quantifies obtainable rates and the quality of jet reconstruction, in both proton-proton and lead-lead collisions at the LHC. In particular, it is addressed whether modification of the jet fragmentation can be detected within the high-particle-multiplicity environment of central lead-lead collisions.
Author: Publisher: ISBN: Category : Languages : en Pages : 8
Book Description
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.
Author: A. Safonov Publisher: ISBN: Category : Languages : en Pages : 4
Book Description
The latest results on jet physics at CDF are presented and discussed. Particular attention is paid to studies of the inclusive jet cross section using 177 pb{sup -1} of Run II data. Also discussed is a study of gluon and quark jet fragmentation.
Author: Publisher: ISBN: Category : Languages : en Pages : 112
Book Description
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.
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Author: Sergo Jindariani
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Author: ![Fragmentation Properties of Jets Produced in Pp Collisions at [square Root Sign] S PDF](https://books.google.com/books/content/images/frontcover/dItHAQAAMAAJ?fife=w80-h100)
Author: Bradley Hubbard
Author: Constantin Loizides
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Author: A. Safonov
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