在LHC精密物理学时代轻中性介子的产生
Light neutral meson production in the era of precision physics at the LHC
摘要：
轻中性介子在不同碰撞系统中的产生是有趣的，原因有很多：在核-核（AA）碰撞中，测量提供了关于部分子穿过夸克-胶子等离子体（QGP）的能量损失的重要信息，QGP是在LHC的重离子碰撞中形成的。在质子-质子（pp）碰撞中，中性介子使我们能够高精度地测试微扰QCD和其他模型计算的预测，也可以作为pA和AA碰撞的参考。在pA碰撞中，研究了冷核物质效应。在致力于QGP研究的ALICE实验中，中性介子可以通过衰变为两个光子来检测。后者可以使用两个量热计EMCal和PHOS或通过检测器材料中的转换来重建。将最先进的重建技术与LHC在运行2中提供的大数据样本相结合，使我们有机会提高测量的精度。在这些会议记录中，概述了中性介子生产的pp，p-Pb和铅-铅碰撞在LHC的能量，与ALICE探测器测量。
英文摘要：
The production of light neutral mesons in different collision systems is interesting for a variety of reasons: In nucleus-nucleus (AA) collisions the measurements provide important information on the energy loss of partons traversing the Quark-Gluon Plasma (QGP) which is formed in heavy-ion collisions at the LHC. In proton--proton (pp) collisions, neutral mesons allow us to test with high precision the predictions of perturbative QCD and other model calculations, and also serve as a reference for pA and AA collisions. In pA collisions, cold nuclear matter effects are studied. In the ALICE experiment, which is dedicated to the study of the QGP, neutral mesons can be detected via their decay to two photons. The latter can be reconstructed using the two calorimeters EMCal and PHOS or via conversions in the detector material. Combining state-of-the-art reconstruction techniques with the large data sample delivered by the LHC in Run 2 gives us the opportunity to enhance the precision of our measurements. In these proceedings, an overview of neutral meson production in pp, p--Pb and Pb--Pb collisions at LHC energies, as measured with the ALICE detector is presented.
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