Light-by-Light Scattering and Axion Like-Particle Searches in Pb plus Pb Collisions at √sNN=5.02 TeV in ATLAS Experiment at LHC

被引：1

作者：

Maj, K. ^{[1
]}

Grabowska-Bold, I ^{[1
]}

机构：

[1] AGH Univ Sci & Technol, Al A Mickiewicza 30, PL-30059 Krakow, Poland

来源：

ACTA PHYSICA POLONICA A | 2021年 / 139卷 / 04期

基金：

英国科学技术设施理事会;

关键词：

light-by-light scattering; axion-like particles; ATLAS;

D O I：

10.12693/APhysPolA.139.422

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The ultra-peripheral Pb+Pb collisions at root s(NN) = 5:02 TeV recorded by the ATLAS experiment are used to study a rare light-by-light scattering process, gamma gamma -> gamma gamma, allowed in quantum electrodynamics via a loop diagram. The report summarises recent light-by-light measurements conducted using a combination of 2015 and 2018 Pb+Pb data sets collected by the ATLAS experiment, corresponding to an integrated luminosity of 2.2 nb. The light-by-light event candidates are required to consist of only two photons produced exclusively, each with transverse energy ET > 2:5 GeV, pseudorapidity vertical bar eta vertical bar < 2:4, diphoton invariant mass m(gamma gamma) > 5 GeV, and with diphoton transverse momentum p(T gamma gamma) < 1 GeV and acoplanarity below 0.01. The diphoton invariant mass distribution is used to set limits on the production of axion-like particles.

引用

页码：422 / 425

页数：4

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