{ "id": "1812.06903", "version": "v1", "published": "2018-12-17T17:19:02.000Z", "updated": "2018-12-17T17:19:02.000Z", "title": "High energy scattering and emission in QED&QCD media", "authors": [ "Xabier Feal" ], "comment": "Some part of this work may overlap with arXiv:1811.01591 and arXiv:1810.02645", "categories": [ "hep-ph", "hep-th" ], "abstract": "A formalism for the evaluation of the intensity of photon and gluon bremsstrahlung in QED and QCD condensed media is presented which considers general interactions beyond the Fokker-Planck/Gaussian approximation, the angular distribution of the final particles and admits finite or structured target calculations. The Boltzmann/transport approaches of Migdal, Bell and the Baier-Dokshitzer-Mueller-Peign\\'e-Schiff group, and the light-cone path integral formalisms of Zakharov and Wiedemann and Gyulassy are recovered as particular cases within the Fokker-Planck limit, which assumes Brownian motion for the intervening particles. Weinberg's soft photon theorem is shown to saturate the Landau-Pomeranchuk-Migdal supression in the soft photon/gluon regime of vanishing phases. The intensity under realistic screened interactions is larger than the existing Fokker-Planck results by a factor 3-4 and the changes can not be accounted for by a single definition of the medium transport properties through $\\hat{q}$. This may also suggest that larger gluon elastic cross sections, leading to the hypothesis of strongly coupled Quark Gluon Plasma, may not be required to match the data.", "revisions": [ { "version": "v1", "updated": "2018-12-17T17:19:02.000Z" } ], "analyses": { "keywords": [ "high energy scattering", "coupled quark gluon plasma", "larger gluon elastic cross sections", "light-cone path integral formalisms", "weinbergs soft photon theorem" ], "note": { "typesetting": "TeX", "pages": 0, "language": "en", "license": "arXiv", "status": "editable" } } }