We propose the enhancement of Λc 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 Λ c . Assuming that stable bound diquarks can exist in the quark-gluon plasma, we argue that the yield of Λ 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 Λ c production indeed leads to a substantial enhancement of the Λ c /D ratio in heavy ion collisions.
Bibliographical noteFunding Information:
This work was supported by the Korea Research Foundation KRF-2006-C00011, the Korea Science and Engineering Foundation R01-2005-000-10334-0, the US National Science Foundation under Grant No. PHY-0457265 and the Welch Foundation under Grant No. A-1358, and the National Science Council of Taiwan under Grant No. NSC96-2112-M002-021.
All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)