Photon and neutral meson measurements with the ALICE experiment at the LHC

32nd Winter Workshop on Nuclear Dynamics

Vauthier, A.^1

LPSC, Université Grenoble-Alpes, CNRS/IN2P3, 53, Avenue des Martyrs, Grenoble Cedex

38026, France^1

关键词: Anisotropic flows;    Heavy ions collisions;    Medium temperature;    Particle production;    Pb-Pb collisions;    Perturbative QCD;    Photon conversion;    Transverse momenta;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/736/1/012006/pdf
DOI  :  10.1088/1742-6596/736/1/012006

来源: IOP

【 摘 要 】

The measurements of photons and neutral mesons, such as π0and η, allow to explore the QCD matter created in heavy-ions collisions. In pp collisions, observables such as differential particle production cross sections can be used to test perturbative QCD calculations and constrain PDFs. In Pb-Pb collisions, neutral meson spectra address the medium induced suppression, whereas low transverse momentum direct photons allow to obtain information on the QCD medium temperature or anisotropic flow. We present an overview of photon and neutral meson measurements, employing three different methods which use both ALICE calorimeters, as well as the central tracking system via the photon conversion method. These experimental results are compared with theoretical predictions.