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Heavy baryon/meson ratios $\Lambda_c/D^0$ and $\Lambda_b/\bar{B}^0$ inrelativistic heavy ion collisions are studied in the quark coalescence model.For heavy baryons, we include production from coalescence of heavy quarks withfree light quarks as well as with bounded light diquarks that might exist inthe strongly coupled quark-gluon plasma produced in these collisions. Includingthe contribution from decays of heavy hadron resonances and also that due tofragmentation of heavy quarks that are left in the system after coalescence,the resulting $\Lambda_c/D^0$ and $\Lambda_b/\bar{B}^0$ ratios in midrapidity($|y|\le 0.5$) from central Au+Au collisions at $\sqrt{s_{NN}}=200$ GeV areabout a factor of five and ten, respectively, larger than those given by thethermal model, and about a factor of ten and twelve, respectively, larger thancorresponding ratios in the PYTHIA model for $pp$ collisions. These ratios arereduced by a factor of about 1.6 if there are no diquarks in the quark-gluonplasma. The transverse momentum dependence of the heavy baryon/meson ratios isfound to be sensitive to the heavy quark mass, with the $\Lambda_b/\bar{B}^0$ratio being much flatter than the $\Lambda_c/D^0$ ratio. The latter peaks atthe transverse momentum $p_T^{} \simeq 0.8$ GeV but the peak shifts to $p_T^{}\simeq 2$ GeV in the absence of diquarks.

Heavy baryon/meson ratios in relativistic heavy ion collisions