Thermal Dilepton Signal and Dileptons from Correlated Open Charm and Bottom Decays in Ultrarelativistic Heavy-Ion Collisions

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


One of the ultimate goals in investigating central heavy-ion collisions at very high energies is to analyze the properties of highly excited and deconfined matter. Direct probes, like electromagnetic signals, are considered as useful messengers of nearly undisturbed information from the transient hot reaction stages. Pairs of electrons and muons are experimentally accessible and will be measured also in forthcoming heavy-ion experiments. However, recent estimates1 of dileptons stemming from semileptonic decays of open charm and bottom mesons produced in the same central collisions of heavy ions show that these represent the dominating dilepton source at energies envisaged at the Relativistic Heavy Ion Collider (RHIC) in Brookhaven and at the Large Hadron Collider (LHC) in CERN. In particular, the dilepton signal from thermalized, strongly interacting matter in the intermediate reaction stages is estimated to be up to two orders of magnitude below the background from correlated decays of open charm or bottom meson pairs in a wide invariant mass region. Even strong energy loss effects of the heavy quarks in the hot and dense medium2, 3, 4 do not basically change this situation: The decay dileptons might be suppressed down to the Drell-Yan background, but it is questionable whether such strong energy loss effects can happen in reality.5


Large Hadron Collider Transverse Momentum Invariant Mass Heavy Quark Transverse Mass 
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Copyright information

© Springer Science+Business Media New York 1998

Authors and Affiliations

  • B. Kämpfer
    • 1
  • K. Gallmeister
    • 1
  • O. P. Pavlenko
    • 2
  1. 1.Research Center RossendorfDresdenGermany
  2. 2.Institute for Theoretical PhysicsKiev-143Ukraine

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