Baryon-antibaryon flavor correlation in quark-combination models in heavy-ion collisions

We extend the study of hadron yield correlation in quark-combination models in a recent publication to baryon-antibaryon flavor correlations in heavy-ion collisions. We show that the universal behaviors of the antibaryon-to-baryon yield ratios as functions of that of $K^{-}$ to $K^{+}$ are naturally explained. We study also the “mixed ratios” and propose other measurements that might be sensitive to the hadronization mechanism.

Figure 1

Antihadron-to-hadron yield ratios as functions of ${\gamma }_{\mathrm{net}}=\langle N_q^{\mathrm{net}}\rangle /\langle N_q\rangle$ for different values of $\lambda$.

Figure 2

Antibaryon-to-baryon yield ratios versus that of $K^{-}$ to $K^{+}$ compared with the data [6, 7, 8, 9, 10, 11, 12, 13, 14, 15]. The energies for BRAHMS, STAR, and ALICE are $\sqrt{s_{NN}}$, while those for NA44, NA49, and AGS are $E_{\mathrm{beam}}$.

Figure 3

Mixed hadron yield ratios derived from data on yields of different hadrons [8, 9, 10, 11, 12]. The horizontal position is only used to specify different ratios.

Figure 4

Baryon-antibaryon flavor correlation factors $c_{B_j{\overline{B}}_k}$, scaled by $\langle N_{B\overline{B}}\rangle /\langle N_B\rangle \langle N_{\overline{B}}\rangle$, as a function of $N_q$ in the case in which the flavor is globally compensated.