Abstract
We study contribution of radiative processes to p_{perp }-broadening of fast partons in an expanding quark–gluon plasma. It is shown that the radiative correction to langle p_{perp }^2rangle for the QGP produced in AA-collisions at RHIC and LHC may be negative, and comparable in absolute value with the non-radiative contribution. We have found that the QGP expansion enhances the radiative suppression of p_perp -broadening as compared to the static medium.
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