Open Charm Production and its Lepton Pair Signal in High Energy Nuclear Collisions
Ziwei Lin
Abstract
Open charm production at the initial and the pre-equilibrium stages in nuclear collisions is studied. The pre-equilibrium contribution to open charm production in A+A collisions at s=200 AGeV is shown to be very sensitive to correlations between momenta and space-time coordinates of the minijets produced after the initial collision. A minimal correlation model based on the uncertainty principle is introduced, and leads only to a small pre-equilibrium charm yield as compared with initial yields. Opposite-sign lepton pairs ee, eμ and μμ from open charm decay in p+A reactions at s=200 AGeV are proposed as a measure of nuclear shadowing effects. Via an approximate scaling, the ratio of the spectra from p+A collisions to those from pp collisions is shown to reflect the shadowing function well. Finally it is shown that the required measurements are feasible at RHIC.
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