Can one discriminate the thermal dilepton signal against the open charm and bottom decay background in ultrarelativistic heavy-ion collisions?

K. Gallmeister; B. Kämpfer; O.P. Pavlenko

doi:doi:10.1007/s100529901105

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2024 Impact factor 4.8

Particles and Fields

Eur. Phys. J. C 8, 473-478
DOI 10.1007/s100529901105

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. Pavlenko^1,2

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

Abstract
In ultrarelativistic heavy-ion collisions at $\sqrt{s} \gt$ 20 (120) A $\cdot$ GeV a copious production of charm (bottom) production sets in which, via correlated semileptonic $D \bar D$ ( $B \bar B$ ) decays, gives rise to a dilepton yield at invariant mass $M \approx$ 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.