Formation of Quark Matter and Photon Physics

作为欧洲核子研究中心爱丽丝国际合作的一部分，我们已经开发并建造了一个电磁量热计PHOS，它由细小分段的钨酸铅晶体与apd读数组成。我们已经在LHC加速器的第一个p+p和pb+pb碰撞中部署了PHOS，并在基于高精度测量的新的LHC领域成功地进行了光子物理，这是PHOS独一无二的可能。我们在大型强子对撞机上观察到了核碰撞系统的新特征，包括高能量密度和强喷流猝灭。他们为夸克物质的性质提供了新的线索。

We have developed and constructed an electromagnetic calorimeter PHOS, composed of finely segmented lead-tungstate crystals coupled with APD readout, as a part of the ALICE international collaboration at CERN. We have deployed PHOS in the first p+p and Pb+Pb collisions at the LHC accelerator, and successfully carried out photon physics in the new LHC domain based on high precision measurement, which PHOS uniquely makes possible. We observed new features of the nuclear collision system at LHC including high energy density and strong jet quenching. They shed new light on properties of quark matter.