Prompt photon yield and elliptic flow from gluon fusion induced by magnetic fields in relativistic heavy-ion collisions

Alejandro Ayala, Jorge David Castaño-Yepes, C. A. Dominguez, L. A. Hernández, Saúl Hernández-Ortiz, and María Elena Tejeda-Yeomans
Phys. Rev. D 96, 014023 – Published 25 July 2017; Erratum Phys. Rev. D 96, 119901 (2017)

Abstract

We compute photon production at early times in semicentral relativistic heavy-ion collisions from nonequilibrium gluon fusion induced by a magnetic field. The calculation accounts for the main features of the collision at these early times, namely, the intense magnetic field and the high gluon occupation number. The gluon fusion channel is made possible by the magnetic field and would otherwise be forbidden due to charge conjugation invariance. Thus, the photon yield from this process is an excess over calculations without magnetic field effects. We compare this excess to the difference between PHENIX data and recent hydrodynamic calculations for the photon transverse momentum distribution and elliptic flow coefficient v2. We show that with reasonable values for the saturation scale and magnetic field strength, the calculation helps us better describe the experimental results obtained at RHIC energies for the lowest part of the transverse photon momentum.

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  • Received 22 April 2017

DOI:https://doi.org/10.1103/PhysRevD.96.014023

© 2017 American Physical Society

Physics Subject Headings (PhySH)

Particles & Fields

Erratum

Erratum: Prompt photon yield and elliptic flow from gluon fusion induced by magnetic fields in relativistic heavy-ion collisions [Phys. Rev. D 96, 014023 (2017)]

Alejandro Ayala, Jorge David Castaño-Yepes, C. A. Dominguez, L. A. Hernández, Saúl Hernández-Ortiz, and María Elena Tejeda-Yeomans
Phys. Rev. D 96, 119901 (2017)

Authors & Affiliations

Alejandro Ayala1,2, Jorge David Castaño-Yepes1, C. A. Dominguez2, L. A. Hernández1, Saúl Hernández-Ortiz1, and María Elena Tejeda-Yeomans3

  • 1Instituto de Ciencias Nucleares, Universidad Nacional Autónoma de México, Apartado Postal 70-543, México Distrito Federal 04510, Mexico
  • 2Centre for Theoretical and Mathematical Physics, and Department of Physics, University of Cape Town, Rondebosch 7700, South Africa
  • 3Departamento de Física, Universidad de Sonora, Boulevard Luis Encinas J. y Rosales, Colonia Centro, Hermosillo, Sonora 83000, Mexico

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Vol. 96, Iss. 1 — 1 July 2017

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