Photon emission in a hot QCD plasma

Various mechanisms of thermal photon production are reviewed and their implications for heavy ion collisions are briefly sketched.Comment: Talk given at Strong and Electroweak Matter 2004, Helsinki, Finland, June 200

Photon and dilepton production in heavy ion collisions at LHC

We review various production mechanisms of photons and small mass dileptons at large transverse momentum in heavy ion collisions at the LHC. Their relevance as a signal for quark-gluon plasma formation is discussed.Comment: 7 page

La QCD et son histoire : partons d'un bon pied!

On présente d'abord très brièvement les modèles d'interactions fortes des années '60- '70. On décrit ensuite les differents ingrédients qui constituent ce qu'il est convenu d'appeler la Chromodynamique Quantique (QCD) perturbative : modèle des partons, le lagrangien QCD, liberté asymptotique, violations d'invariance d'échelle. On mentionne enfin quelques applications de la QCD perturbative

A new critical study of photon production in hadronic collisions

In the light of the new prompt photon data collected by PHENIX at RHIC and by D0 at the run II of the Tevatron, we revisit the world prompt photon data, both inclusive and isolated, in hadronic collisions, and compare them with the NLO QCD calculations implemented in the Monte Carlo programme JETPHOX.Comment: 19 pages; 12 figure

Enhanced thermal production of hard dileptons by 3→23\to 2 processes

In the framework of the Hard Thermal Loop effective theory, we calculate the two-loop contributions to hard lepton pair production in a quark-gluon plasma. We show that the result is free of any infrared and collinear singularity. We also recover the known fact that perturbation theory leads to integrable singularities at the location of the threshold for $q\bar{q}\to\gamma^*$. It appears that the process calculated here significantly enhances the rate of low mass hard dileptons.Comment: 32 latex pages, 14 postscript figure

A simple sum rule for the thermal gluon spectral function and applications

In this paper, we derive a simple sum rule satisfied by the gluon spectral function at finite temperature. This sum rule is useful in order to calculate exactly some integrals that appear frequently in the photon or dilepton production rate by a quark gluon plasma. Using this sum rule, we rederive simply some known results and obtain some new results that would be extremely difficult to justify otherwise. In particular, we derive an exact expression for the collision integral that appears in the calculation of the Landau-Pomeranchuk-Migdal effect.Comment: 24 latex pages, 2 postscript figure

近十年关于毛泽东对资本主义认识的研究述评

本文对近年来有关毛泽东对资本主义的认识的演变、主张、局限性、改变认识的原因以及与列宁、刘 少奇、张闻天、邓小平等人的比较研究情况做了综述,认为毛泽东吸收借鉴了张闻天、刘少奇等的观点,形成了自 己对资本主义的认识。但后来改变了以往对资本主义的比较积极的看法而走向消极,表现出一定的局限性,改变的 原因也是多方面的。邓小平则创造性地发展了毛泽东的思想,大胆利用资本主义的文明成果,对于中国社会主义建 设起到了积极作用

QCD

We discuss issues of QCD at the LHC including parton distributions, Monte Carlo event generators, the available next-to-leading order calculations, resummation, photon production, small x physics, double parton scattering, and backgrounds to Higgs production.Comment: 115 pages, Latex, 47 figures, to appear in the Report of the ``1999 CERN Workshop on SM Physics (and more) at the LHC'', S. Catani, M. Dittmar, D. Soper, W.J. Stirling, S. Tapprogge (convenors