Magnetic contribution to dilepton production in heavy-ion collisions

Abstract

We calculate a novel "magnetic contribution" to the dilepton spectrum in heavy-ion collisions arising from interaction of relativistic quarks with intense magnetic field. Synchrotron radiation by quarks, which can be approximated by the equivalent photon flux, is followed by dilepton decay of photons in an intense magnetic field. We argue that the "magnetic contribution" dominates the dilepton spectrum at low lepton energies, whereas a conventional photon dilepton decay dominates at higher lepton energies. Disciplines Astrophysics and Astronomy | Physics CommentsThis article is from Physical Review C 88 (2013) We calculate a novel "magnetic contribution" to the dilepton spectrum in heavy-ion collisions arising from interaction of relativistic quarks with intense magnetic field. Synchrotron radiation by quarks, which can be approximated by the equivalent photon flux, is followed by dilepton decay of photons in an intense magnetic field. We argue that the "magnetic contribution" dominates the dilepton spectrum at low lepton energies, whereas a conventional photon dilepton decay dominates at higher lepton energies.

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“…Analytical solution to these equations shows that the EMF decreases with time much slower than in vacuum and is approximately collision energy independent; rather it depends only on the impact parameter and the electrical conductivity of the QGP [4,[10][11][12]. Numerical simulations that take into account the QGP expansion [13] qualitatively agree with this conclusion.…”

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“…[26,[93][94][95][96][97] in which the authors studied how the spectators induced magnetic field evolve in QGP phase (assuming the system is already in the QGP phase at the initial time). The main information from these studies are that the presence of the conducting matter can significantly delay the decay of the magnetic field.…”

“…The event average of χ should be zero. Equation (93) represents four kinds of flows: the normal directed flow and elliptic flow (the second and third terms), and the normal electric conduction along ψ E (the fourth term), the pure CME along ψ B (the fifth term), and the combined CESE and CME (the sixth term, which we will simply call CESE term).…”

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