Physics and Astronomy
Journal or Book Title
Physical Review Letters
The PHENIX experiment has measured midrapidity (vertical bar eta vertical bar < 0.35) transverse momentum spectra (0.4 < p(T)< 5.0 GeV/c) of electrons as a function of centrality in Au+Au collisions at root s(NN) = 200 GeV. Contributions from photon conversions and from light hadron decays, mainly Dalitz decays of pi(0) and eta mesons, were removed. The resulting nonphotonic electron spectra are primarily due to the semileptonic decays of hadrons carrying heavy quarks. Nuclear modification factors were determined by comparison to nonphotonic electrons in p+p collisions. A significant suppression of electrons at high p(T) is observed in central Au+Au collisions, indicating substantial energy loss of heavy quarks.
American Physical Society
Adler, S. S.; Belikov, Sergey; Bhagavatula, S.; Constantin, Paul; Grau, Nathan C.; Hill, John C.; Lajoie, John G.; Lebedev, Alexandre; Ogilvie, Craig; Rak, Jan; Rosati, Marzia; Wohn, F. K.; et al.; and PHENIX Collaboration, "Nuclear modification of electron spectra and implications for heavy quark energy loss in Au + Au collisions at root s(NN)=200 GeV" (2006). Physics and Astronomy Publications. 355.