Collisional energy losses of heavy quarks in relativistic nuclear collisions at energies available at the BNL Relativistic Heavy Ion Collider

Details Collisional energy losses of heavy quarks in relativistic nuclear collisions at energies available at the BNL Relativistic Heavy Ion Collider Collisional energy losses of heavy quarks in relativistic nuclear collisions at energies available at the BNL Relativistic Heavy Ion Collider

2011-10-06

arxiv.org/abs/1110.1211v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

8 pages, 3 figures

Scientific paper

We investigate the energy losses of $b$ and $c$ quarks at hard collisions with gluons and light quarks in quark-gluon plasma produced in central $Au + Au$ collisions at RHIC energy($\sqrt{s_{NN}} = 200$ GeV). As the coupling constant at hard collision in the perturbative QCD is limited by Landau pole at momenta $Q^{2} = \Lambda^{2}$, we use the analytic models of QCD, where the Landau pole is absent. We calculate the energy losses of $b$ and $c$ quarks in analytic model of QCD at $Q^{2} \ge \Lambda^{2}$. At calculations we use the effective quasiparticle model. We use at calculations of total nuclear modification factor $R_{AA}^{b+c}$ the fragmentation of $b$ and $c$ quarks into heavy hadrons with accounting theirs energy losses. We show that this factor gives the considerably suppression of heavy $B$ and $D$ mesons in the region of middle meanings of $p_{\perp}$. The experimental data \cite{2} show, that nonphotonic electrons have the analogous suppression in the same region of $p_{\perp}$.

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