arXiv 1704.063072017-04nucl-ex

光子和双轻子观测：实验综述

Photon and dilepton observables: An experimental overview

S. Campbell

备注：: 7 pages, 4 figures, proceedings for plenary talk at Quark Matter 2017, to be published in Nuclear Physics A
DOI：: 10.1016/j.nuclphysa.2017.05.099

摘要：

在重离子碰撞中的双轻子和直接光子测量提供了进入碰撞早期阶段的途径。在SPS和RHIC的双轻子连续测量表明，作为强子相互作用的结果，与ρ介子谱函数的加宽一致的过量。在RHIC和LHC上的直接光子测量表明，低$p_{T}$光子超过了预期的产额。这种过量相对于碰撞平面具有大的方位各向异性。对直接光子过剩及其各向异性的理解已成为重离子物理领域的一个突出问题。本程序包括在2017年国际超相对论性核-核碰撞会议上展示的新的双轻子和直接光子实验结果的总结，并在我们目前对这些电磁探针的理解的背景下介绍它们。

英文摘要：

Dilepton and direct photon measurements in heavy ion collisions provide access to the early stages of the collision. Dilepton continuum measurements at SPS and RHIC show an excess consistent with broadening of the rho meson spectral function as a result of hadronic interactions. Direct photon measurements at RHIC and the LHC show an excess of low $p_{T}$ photons over the expected yield. This excess has a large azimuthal anisotropy with respect to the collision plane. Understanding the direct photon excess and its anisotropy has become an outstanding question in the field of heavy ion physics. This proceeding consists of a summary of new dilepton and direct photon experimental results shown at the 2017 International Conference on Ultrarelativistic Nucleus-Nucleus Collisions and presents them in the context of our current understanding of these electromagentic probes.

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