Moving doubly heavy baryon in a strongly coupled plasma from holography

Abstract

Gauge/gravity duality is used to study properties of the doubly heavy baryon $(\mathrm{QQq})$ at finite rapidity and temperature in the heavy-ion collision. We investigate the impact of rapidity on string breaking and screening of $\mathrm{QQq}$, and compare these effects with the results for $\mathrm{Q}\bar{\mathrm{Q}}$ in detail. Computations reveal that the string-breaking distances of $\mathrm{QQq}$ and $\mathrm{Q}\bar{\mathrm{Q}}$ are close in the confined state and the effects of rapidity and temperature on the string breaking are not significant. An interesting result shows that $\mathrm{QQq}$ cannot be found at high enough temperatures and rapidities; however, $\mathrm{Q}\bar{\mathrm{Q}}$ can exist under any conditions as long as the separation distance is small enough. Besides, the screening distances of $\mathrm{QQq}$ and $\mathrm{Q}\bar{\mathrm{Q}}$ are also compared at finite rapidity and temperature. Based on the above analysis, we infer that $\mathrm{Q}\bar{\mathrm{Q}}$ is more stable than $\mathrm{QQq}$ at finite rapidity and temperature.