Probing quark gluon plasma properties by heavy flavours

Aug, 2009
9 pages
Published in:
  • Phys.Rev.C 80 (2009) 054916
e-Print:

Citations per year

20092013201720212023024681012
Abstract: (arXiv)
We find that the heavy flavours remain out of equilibrium in an expanding quark gluon plasma. Therefore, to study the transverse momentum (pTp_T) spectra of DD and BB mesons, the Fokker-Planck equation has been solved. The solution of the Fokker-Planck equation has been convoluted with the relevant fragmentation functions to obtain the DD-meson spectra. The results are compared with experimental data measured by STAR collaboration. It is found that the present experimental data can not distinguish between the pTp_T spectra obtained from the equilibrium and non-equilibrium charm distributions. Data at lower pTp_T may play a crucial role in making the distinction between the two. The nuclear suppression factor, RAAR_{\mathrm AA} for non-photonic single electron spectra resulting from the semileptonic decays of hadrons containing heavy flavours have been evaluated using the present formalism. It is observed that the experimental data on nuclear suppression factor of the non-photonic electrons can be reproduced within this formalism by enhancing the pQCD cross sections by a factor of 2 provided the expansion of the bulk matter is governed by the velocity of sound, cs1/4c_s\sim 1/\sqrt{4}. Ideal gas equation of state fails to reproduce the data even with the enhancement of the cross sections.
  • 24.85.+p
  • 25.75.Nq
  • 12.38.Mh
  • heavy quark
  • quark gluon: plasma
  • electron: transverse momentum
  • Fokker-Planck equation: solution
  • D: semileptonic decay
  • quantum chromodynamics: perturbation theory
  • fragmentation function