Towards an understanding of the RHIC single electron data

Details Towards an understanding of the RHIC single electron data Towards an understanding of the RHIC single electron data

2008-02-18

arxiv.org/abs/0802.2525v2

Phys.Rev.C78:014904,2008

Physics

High Energy Physics

High Energy Physics - Phenomenology

Accepted for publication in Physical Review C

Scientific paper

10.1103/PhysRevC.78.014904

High transverse momentum ($p_T$) single non-photonic electrons which have been measured in the RHIC experiments come dominantly from heavy meson decay. The ratio of their $p_T$ spectra in pp and AA collisions ($R_{AA}(p_T)$) reveals the energy loss of heavy quarks in the environment created by AA collisions. Using a fixed coupling constant and the Debye mass ($m_D\approx gT$) as infrared regulator perturbative QCD (pQCD) calculations are not able to reproduce the data, neither the energy loss nor the azimuthal $(v_2)$ distribution. Employing a running coupling constant and replacing the Debye mass by a more realistic hard thermal loop (HTL) calculation we find a substantial increase of the collisional energy loss which brings the $v_2(p_T)$ distribution as well as $R_{AA}(p_T)$ to values close to the experimental ones without excluding a contribution from radiative energy loss.

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