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Jet Shapes in Opaque Media

Antonio D. Polosa, Carlos A. Salgado

Abstract

We present general arguments, based on medium-induced radiative energy loss, which reproduce the non-gaussian shapes of away-side di-jet azimuthal correlations found in nucleus-nucleus collisions at RHIC. A rather simple generalization of the Sudakov form factors to opaque media allowing an effective description of the experimental data is proposed.

Jet Shapes in Opaque Media

Abstract

We present general arguments, based on medium-induced radiative energy loss, which reproduce the non-gaussian shapes of away-side di-jet azimuthal correlations found in nucleus-nucleus collisions at RHIC. A rather simple generalization of the Sudakov form factors to opaque media allowing an effective description of the experimental data is proposed.

Paper Structure

This paper contains 17 equations, 2 figures.

Figures (2)

  • Figure 1: The probability of just one splitting (\ref{['eq:splitms']}) as a function of the laboratory azimuthal angle $\Delta\Phi$ for a gluon jet of $E_{\rm jet}=7$ GeV. Different medium lengths are plotted for the J- and Y-configurations (solid and dotted lines respectively).
  • Figure 2: Position of the peaks of the $\Delta\Phi$-distribution and comparison with PHENIX data from Ref. Grau:2005sm for the J- and Y-configurations. We also show the analytical estimate (\ref{['eq:phimax']}) without any smearing.