In ultra-relativistic heavy-ion collisions at center-of-mass energy of 5.5 TeV at the
Large Hadron Collider(LHC), interactions between the high-momentum Parton and the hot, dense medium produced in the collisions, are expected to lead to jet energy loss, the so-called jet quenching, resulting in changes in the jet fragmentation functions as compared to the unquenched case.
High-energy nucleus–nucleus collisions allow us to change the scene of parton fragmentation from vacuum to a QCD medium, the
Quark gluon plasma(QGP), and to studythe properties of this medium through modifications of the jet structure. High-momentum partons produced in the initial stage of a nucleus–nucleus collision are expected to undergo multiple interactions inside the collision region prior to hadronisation. Hereby, the energy of the partons is reduced through collisional energy loss  and medium-induced gluon radiation  , the latter being the dominant mechanism in a QGP. The effect of jet quenching in QGP is the main motivation for studying jets as well as high-momentum particle spectra and particle correlations in heavy-ion collisions.
First evidence of parton energy loss has been observed at RHIC from the suppression of high-pt particles studying the nuclear modification factor  and the suppression of back-to-back correlations  .
Accurate jet reconstruction will allow measurements of the jet fragmentation functions and consequently the degree of quenching and therefore provide insight on the properties of the hot dense medium (QGP) created in the collisions.
 D. H. Perkins, Introduction to High Energy Physics, Cambridge University Press (2000);
 D. Gross and F. Wilczek, Phys. Rev. Lett. 30, 1343 (1973)
 Adcox K et al (PHENIX Collaboration) 2002 Phys. Rev. Lett. 88 022301
 Adler C et al (STAR Collaboration) 2003 Phys. Rev. Lett. 90 082302
Wikimedia Foundation. 2010.
Look at other dictionaries:
Jet (particle physics) — A jet is a narrow cone of hadrons and other particles produced by the hadronization of a quark or gluon in a particle physics or heavy ion experiment. Because of QCD confinement, particles carrying a color charge, such as quarks, cannot exist in… … Wikipedia
Relativistic Heavy Ion Collider — Hadron colliders Caption=The Relativistic Heavy Ion Collider at Brookhaven National Laboratory. Some of the superconducting magnets were manufactured by Northrop Grumman Corp. at Bethpage, New York. Note especially the second, independent ring… … Wikipedia
String theory — This article is about the branch of theoretical physics. For other uses, see String theory (disambiguation). String theory … Wikipedia
Quark-gluon plasma — A quark gluon plasma (QGP) is a phase of quantum chromodynamics (QCD) which exists at extremely high temperature and/or density. This phase consists of (almost) free quarks and gluons, which are the basic building blocks of matter. Experiments at … Wikipedia
Теория струн — Теория суперструн Теория … Википедия
История строительства и эксплуатации LHC — Эта статья предлагается к удалению. Пояснение причин и соответствующее обсуждение вы можете найти на странице Википедия:К удалению/24 октября 2012. Пока процесс обсужден … Википедия
Quark–gluon plasma — A QGP is formed at the collision point of two relativistically accelerated gold ions in the center of the STAR detector at the relativistic heavy ion collider at the Brookhaven national laboratory. A quark–gluon plasma … Wikipedia
steel — steellike, adj. /steel/, n. 1. any of various modified forms of iron, artificially produced, having a carbon content less than that of pig iron and more than that of wrought iron, and having qualities of hardness, elasticity, and strength varying … Universalium
TWA Flight 800 — For the 1964 crash of a TWA Boeing 707 in Rome, Italy, see TWA Flight 800 (1964). TWA Flight 800 Recovered TWA 800 wreckage Accident summary Date … Wikipedia
metallurgy — metallurgic, metallurgical, adj. metallurgically, adv. metallurgist /met l err jist/ or, esp. Brit., /meuh tal euhr jist/, n. /met l err jee/ or, esp. Brit., /meuh tal euhr jee/, n. 1. the technique or science of working or heating metals so as… … Universalium