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Production of $\eta_c$ and dimuon enhancement in heavy ion collisions

Authors:	Email author" target="_blank">Rahul?Basu Email author K?Sridhar

Institution:	(1) The Institute of Mathematical Sciences, C.I.T. Campus, 600113 Chennai, India;(2) Department of Theoretical Physics, Tata Institute of Fundamental Research, Homi Bhabha Road, 400005 Mumbai, India

Abstract:	Dilepton production in heavy ion collisions in the intermediate mass region (IMR) has consistently shown an excess over theoretical estimates. An attempt to understand this discrepancy between the observed dilepton pairs and the theoretical estimate is made here through the production of the $\eta_c$ meson and estimates obtained by NRQCD calculations. We find that $\eta_c$ production offers a satisfactory quantitative picture for explaining the discrepancy.Received: 13 August 2003, Revised: 9 February 2004, Published online: 23 March 2004

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