Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2008-03-10
Mod.Phys.Lett.A23:2254-2258,2008
Physics
Nuclear Physics
Nuclear Theory
Prepared for Chiral Symmetry in Hadron and Nuclear Physics (Chiral07), Nov. 13-16, 2007, Osaka, Japan
Scientific paper
10.1142/S0217732308029149
We propose the enhancement of $\Lambda_c$ yield in heavy ion collisions at RHIC and LHC as a novel signal for the existence of diquarks in the strongly coupled quark-gluon plasma produced in these collisions as well as in the $\Lambda_c$. Assuming that stable bound diquarks can exist in the quark-gluon plasma, we argue that the yield of $\Lambda_c$ would be increased by two-body collisions between $ud$ diquarks and $c$ quarks, in addition to normal three-body collisions among $u$, $d$ and $c$ quarks. A quantitative study of this effect based on the coalescence model shows that including the contribution of diquarks to $\Lambda_c$ production indeed leads to a substantial enhancement of the $\Lambda_c/D$ ratio in heavy ion collisions.
Ko Che Ming
Lee Hong Seok
Ohnishi Katsuhiko
Yasui Shigehiro
Yoo In-Kwon
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