c enhancement from strongly coupled quark-gluon plasma
Abstract
We propose the enhancement of c as a novel QGP signal in heavy ion collisions at RHIC and LHC. Assuming a stable bound diquark state in the strongly coupled QGP near the critical temperature, we argue that the direct two-body collision between a c quark and a [ud] diquark would lead to an enhanced c production in comparison with the normal three-body collision among independent c, u and d quarks. In the coalescence model, we find that the c/D yield ratio is enhanced substantially due to the diquark correlation.
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