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Intermediate Mass Dileptons from the Passage of Jets and High Energy Photons through Quark-Gluon Plasma

FU Yong-Ping,LI Yun-De,

中国物理快报 , 2010,
High energy photons from passage of jets through quark gluon plasma  [PDF]
R. J. Fries,B. Müller,D. K. Srivastava
Physics , 2002, DOI: 10.1103/PhysRevLett.90.132301
Abstract: We calculate the production of high energy photons from Compton scattering and annihilation of a quark jet passing through a quark gluon plasma produced in a relativistic heavy ion collision. The contributions are large and reflect the momentum distribution of the jets and the initial conditions of the plasma.
The electromagnetic signature of jets  [PDF]
Charles Gale,T. C. Awes,Rainer J. Fries,Dinesh K. Srivastava
Physics , 2004, DOI: 10.1088/0954-3899/30/8/049
Abstract: Recent RHIC data have suggested an interesting scenario where jets, after being formed in the very first instants of the nuclear collision, interact strongly and are absorbed by the hot and dense matter subsequently created. In this respect, electromagnetic signals constitute another class of penetrating radiation. We first propose the study of large mass dileptons induced by the passage of high-energy quark jets through quark-gluon plasma. We find that the yield due to the jet-plasma interaction gets progressively larger as the collision energy increases: it is slightly less than the Drell-Yan contribution at RHIC energies, and it is a factor of 10 larger than Drell-Yan at the LHC. In a related investigation, we then propose to study dilepton-tagged jets. We estimate quantitatively the various background sources, and identify windows where those are sub-dominant.
Properties of Gluon and Quark Jets  [PDF]
Klaus Hamacher
Physics , 1998,
Abstract: Recent developments and results on the comparison of gluon to quark jets are discussed. A most important topic is the introduction of explicit energy scales of the jets. The scaling violation of the fragmentation function and the increase of the multiplicity with scale is shown to be directly proportional to the corresponding gluon or quark colour factor. The ratio of the hadron multiplicity in gluon to quark jets is understood to be smaller than the colour factor ratio due to differences in the fragmentation of the leading quark or gluon. Novel algorithms to reconstruct the colour portraits or the colour flow of an event are presented.
Dileptons from a Quark Gluon Plasma with Finite Baryon Density  [PDF]
A. Majumder,C. Gale
Physics , 2000, DOI: 10.1103/PhysRevD.64.119901
Abstract: We investigate the effects of a baryon-antibaryon asymmetry on the spectrum of dileptons radiating from a quark gluon plasma. We demonstrate the existence of a new set of processes in this regime. The dilepton production rate from the corresponding diagrams is shown to be as important as that obtained from the usual quark-antiquark annihilation.
Comparing Gluon to Quark Jets with DELPHI  [PDF]
Oliver Klapp,Patrick Langefeld
Physics , 1999,
Abstract: This is a summary of the latest results of the DELPHI Collaboration on the properties of identified quark and gluon jets. It covers the measurement of the fragmentation functions of gluons and quarks and their scaling violation behaviour as well as an analysis of the scale dependence of the multiplicities in gluon and quark jets. Further, a precision measurement of CA/CF from the multiplicities in symmetric three jet events is discussed.
The Subjet Multiplicity in Quark and Gluon Jets  [PDF]
Michael H. Seymour
Physics , 1996, DOI: 10.1016/0370-2693(96)00399-1
Abstract: We calculate the mean number of subjets in quark and gluon jets in the final state of e^+e^- annihilation. Since `quark' and `gluon' jets are scheme-dependent objects, we stress the importance of using the same definition as in experimental analyses. We define the jets using the k_perp algorithm at a coarse scale y_1, and the subjets using a finer scale y_0, in the same algorithm. Gluon jets are anti-tagged by the presence of heavy quarks in both other jets. Our result is exact to leading order in alpha_s, and resums leading and next-to-leading logarithmic terms in the ratio y_1/y_0 to all orders in alpha_s.
Experimental treatment of Quark and Gluon Jets  [PDF]
Sona Pochybova
Physics , 2011,
Abstract: The separate study of quark and gluon jets is vital for the interpretation of multiple variables behaviour observed in both high-energy hadron and heavy-ion collisions in the present and future experiments. We propose a set of jet-energy dependent cuts to be used to distinguish between quark and gluon jets experimentally based on a Monte-Carlo study of their properties. Further, we introduce the possibility to calibrate these cuts via gamma-jet and multi-jet events, which represent clean production channels for quark and gluon jets, respectively. The calibration can happen on real data and thus, reduces the dependence of the method performance on Monte-Carlo model predictions.
Rapidity Distributions of Dileptons from a Hadronizing Quark-Gluon Plasma  [PDF]
R. Vogt,B. V. Jacak,P. L. McGaughey,P. V. Ruuskanen
Physics , 1993, DOI: 10.1103/PhysRevD.49.3345
Abstract: It has been predicted that dilepton production may be used as a quark-gluon plasma probe. We calculate the rapidity distributions of thermal dileptons produced by an evolving quark-gluon plasma assuming a longitudinal scaling expansion with initial conditions locally determined from the hadronic rapidity density. These distributions are compared with Drell-Yan production and semileptonic charm decays at invariant mass $M = 2$, 4, and 6 GeV.
Production and Elliptic Flow of Dileptons and Photons in the semi-Quark Gluon Plasma  [PDF]
C. Gale,Y. Hidaka,S. Jeon,S. Lin,J. -F. Paquet,R. D. Pisarski,D. Satow,V. V. Skokov,G. Vujanovic
Physics , 2014, DOI: 10.1103/PhysRevLett.114.072301
Abstract: We consider the thermal production of dileptons and photons at temperatures above the critical temperature in QCD. We use a model where color excitations are suppressed by a small value of the Polyakov loop, the semi Quark-Gluon Plasma (QGP). Comparing the semi-QGP to the perturbative QGP, we find a mild enhancement of thermal dileptons. In contrast, to leading logarithmic order in weak coupling there are far fewer hard photons from the semi-QGP than the usual QGP. To illustrate the possible effects on photon and dileptons production in heavy ion collisions, we integrate the rate with a realistic hydrodynamic simulation. Dileptons uniformly exhibit a small flow, but the strong suppression of photons in the semi-QGP tends to bias the elliptical flow of photons to that generated in the hadronic phase.
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