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Photons from the Early Stages of Relativistic Heavy Ion Collisions
2017-03-08  【 】【打印】【关闭

Institute of Theoretical Physics

Chinese Academy of Sciences

 Key Laboratory of Theoretical Physics

Seminar

Title

题目

Photons from the Early Stages of Relativistic Heavy Ion Collisions

Speaker

报告人

Dr. Marco Ruggieri

Affiliation

所在单位

University of Chinese Academy of Sciences

Date

日期

2017年3月8日(周三)下午15:00

Venue

地点

Conference Hall 322, ITP

Abstract

摘要

We present results about photons production in relativistic heavy ion collisions. The main novelty of our study is the calculation of the contribution of the early stage photons to the photon spectrum. The initial stage is modeled by an ensemble of classical gluon fields which decay to a quark-gluon plasma via the Schwinger mechanism, and the evolution of the system is studied by coupling classical field equations to relativistic kinetic theory; photons production is then computed by including the pertinent collision processes into the collision integral. We find that the contribution of early stage photons to the direct photon spectrum is substantial in the transverse momentum region $p_T\gtrsim 1.5$ GeV: therefore we identify this part of the photon spectrum as the sign of the early stage. Moreover, the amount of photons produced during the early stage is not negligible with respect to those produced by a thermalized quark-gluon plasma: we support the idea that there is no dark age in relativistic heavy ion collisions.

Contact Person

联系人

郭奉坤
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