Centrality dependence of photon yield and elliptic flow from gluon fusion and splitting induced by magnetic fields in relativistic heavy-ion collisions

被引：17

作者：

Ayala, Alejandro ^{[1
,2
]}

David Castano-Yepes, Jorge ^{[1
]}

Dominguez Jimenez, Isabel ^{[3
]}

Salinas San Martin, Jordi ^{[1
]}

Elena Tejeda-Yeomans, Maria ^{[4
]}

机构：

[1] Univ Nacl Autonoma Mexico, Inst Ciencias Nucl, Apartado Postal 70-543, Cdmx 04510, Mexico

[2] Univ Cape Town, Ctr Theoret & Math Phys, Dept Phys, ZA-7700 Rondebosch, South Africa

[3] Univ Autonoma Sinaloa, Fac Ciencias Fis Matemat, Ave Amer & Blvd Univ,Ciudad Univ, Culiacan 80000, Sinaloa, Mexico

[4] Univ Colima, Fac Ciencias CUICBAS, Bernal Diaz del Castillo 340, Colima 28045, Mexico

来源：

EUROPEAN PHYSICAL JOURNAL A | 2020年 / 56卷 / 02期

关键词：

EVENT;

D O I：

10.1140/epja/s10050-020-00060-9

中图分类号：

O57 [原子核物理学、高能物理学];

学科分类号：

070202 ;

摘要：

We compute the photon yield and elliptic flow coefficient in relativistic heavy-ion collisions from gluon fusion and splitting processes induced by a magnetic field for different centralities. The calculation accounts for the intense magnetic field and the high gluon occupation number at early times. The photon production induced by these process represents an excess contribution 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. The time evolution of the field strength and reaction volume is computed using UrQMD. We show that with reasonable values for the saturation scale, the calculation helps to better describe the experimental results obtained at RHIC energies for the lowest part of the transverse photon momentum at different centralities.

引用

页数：11

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