Can one discriminate the thermal dilepton signal against the open charm and bottom decay background in ultrarelativistic heavy-ion collisions?
K. Gallmeister1 - B. Kämpfer1 - O.P. Pavlenko1,2
1 Forschungszentrum Rossendorf, PF 510119, D-01314 Dresden, Germany
2 Institute for Theoretical Physics, 252143 Kiev - 143, Ukraine
Received: 28 September 1998 / Revised version: 27 November 1998 / Published online: 22 March 1999
In ultrarelativistic heavy-ion collisions at 20 (120) AGeV a copious production of charm (bottom) production sets in which, via correlated semileptonic () decays, gives rise to a dilepton yield at invariant mass 2 - 3 GeV in excess of the Drell-Yan yield and the thermal dilepton signal from deconfined matter as well. We show that appropriate single-electron transverse momentum cuts (suitable for ALICE at LHC) cause a threshold like behavior of the dilepton spectra from heavy-quark meson decays and the Drell-Yan process and can allow to observe a thermal dilepton signal from hot deconfined matter.