Acoplanarity of a Lepton Pair to Probe the Electromagnetic Property of Quark Matter

Open Access

Acoplanarity of a Lepton Pair to Probe the Electromagnetic Property of Quark Matter

Spencer Klein, A. H. Mueller, Bo-Wen Xiao, and Feng Yuan

Phys. Rev. Lett. 122, 132301 – Published 3 April 2019

Abstract

We investigate the $P_{T}$ -broadening effects in dilepton production through photon-photon scattering in heavy ion collisions. The QED multiple interaction effect with the medium is found to be consistent with the recent observation of a low transverse momentum lepton pair from the ATLAS Collaboration at the LHC. We further comment on the magnetic broadening effect and point out a number of ways to disentangle these two mechanisms. In particular, the rapidity dependence of the $P_{T}$ -broadening effect provides a unique probe to the magnetic effect.

Received 28 November 2018
Revised 4 March 2019

DOI:https://doi.org/10.1103/PhysRevLett.122.132301

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP³.

Published by the American Physical Society

Physics Subject Headings (PhySH)

Photon, lepton & quark production Quantum electrodynamics Quark-gluon plasma Relativistic heavy-ion collisions

Nuclear PhysicsParticles & Fields

Authors & Affiliations

Spencer Klein¹, A. H. Mueller², Bo-Wen Xiao^3,4, and Feng Yuan¹

¹Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
²Department of Physics, Columbia University, New York, New York 10027, USA
³Key Laboratory of Quark and Lepton Physics (MOE) and Institute of Particle Physics, Central China Normal University, Wuhan 430079, China
⁴Centre de Physique Théorique, École Polytechnique, CNRS, Université Paris-Saclay, Route de Saclay, 91128 Palaiseau, France