Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Prompt photon yield and elliptic flow from gluon fusion induced by
  magnetic fields in relativistic heavy-ion collisions   We compute photon production at early times in semi-central relativistic
heavy-ion collisions from non-equilibrium 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 $v_2$. We show that with reasonable
values for the saturation scale and magnetic field strength, the calculation
helps to better describe the experimental results obtained at RHIC energies for
the lowest part of the transverse photon momentum.

30
The categories of this paper are: q-alg
5
The categories of this paper are: gr-qc
37
The categories of this paper are: supr-con
4
The categories of this paper are: cond-mat
34
The categories of this paper are: chem-ph
23
The categories of this paper are: solv-int
12
The categories of this paper are: nucl-th
17
The categories of this paper are: q-fin
20
The categories of this paper are: acc-phys
8
The categories of this paper are: hep-ex
10
The categories of this paper are: q-bio
14
The categories of this paper are: math-ph
36
The categories of this paper are: cmp-lg
2
The categories of this paper are: math
16
The categories of this paper are: stat
31
The categories of this paper are: ao-sci