Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2010-06-15
Phys.Rev.C82:034904,2010; Erratum-ibid.C83:039903,2011
Physics
Nuclear Physics
Nuclear Theory
10 pages, 6 figures; v3: estimate of the relaxation time of magnetic field is revised, acknowledgment added
Scientific paper
10.1103/PhysRevC.82.034904 10.11
We study the synchrotron radiation of gluons by fast quarks in strong magnetic field produced by colliding relativistic heavy-ions. We argue that due to high electric conductivity of plasma, time variation of the magnetic field is slow and estimate its relaxation time. We calculate the energy loss due to synchrotron radiation of gluons by fast quarks. We find that the typical energy loss per unit length for a light quark at LHC is a few GeV per fm. This effect alone predicts quenching of jets with $p_\bot$ up to about 20 GeV. We also show that the spin-flip transition effect accompanying the synchrotron radiation leads to a strong polarization of quarks and leptons with respect to the direction of the magnetic field. Observation of the lepton polarization may provide a direct evidence of existence of strong magnetic field in heavy-ion collisions.
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