Prompt photon yield and elliptic flow from gluon fusion induced by magnetic fields in relativistic heavy-ion collisions
Por:
Ayala, Alejandro, David Castano-Yepes, Jorge, Dominguez, C. A., Hernandez, L. A., Hernandez-Ortiz, Saul, Elena Tejeda-Yeomans, Maria
Publicada:
25 jul 2017
Categoría:
Physics and astronomy (miscellaneous)
Resumen:
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 v(2). 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.
Filiaciones:
Ayala, Alejandro:
Univ Nacl Autonoma Mexico, Inst Ciencias Nucl, Apartado Postal 70-543, Mexico City 04510, DF, Mexico
Univ Cape Town, Ctr Theoret & Math Phys, ZA-7700 Rondebosch, South Africa
Univ Cape Town, Dept Phys, ZA-7700 Rondebosch, South Africa
David Castano-Yepes, Jorge:
Univ Nacl Autonoma Mexico, Inst Ciencias Nucl, Apartado Postal 70-543, Mexico City 04510, DF, Mexico
Dominguez, C. A.:
Univ Cape Town, Ctr Theoret & Math Phys, ZA-7700 Rondebosch, South Africa
Univ Cape Town, Dept Phys, ZA-7700 Rondebosch, South Africa
Hernandez, L. A.:
Univ Nacl Autonoma Mexico, Inst Ciencias Nucl, Apartado Postal 70-543, Mexico City 04510, DF, Mexico
Hernandez-Ortiz, Saul:
Univ Nacl Autonoma Mexico, Inst Ciencias Nucl, Apartado Postal 70-543, Mexico City 04510, DF, Mexico
Elena Tejeda-Yeomans, Maria:
Univ Sonora, Dept Fis, Blvd Luis Encinas J y Rosales, Hermosillo 83000, Sonora, Mexico
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