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 $\rm Q\bar{ Q}$ in detail. Computations reveal that the string-breaking distances of $\mathrm{ QQq}$ and $\rm Q\bar{ Q}$ 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, $\rm Q\bar{ Q}$ can exist under any conditions as long as the separation distance is small enough. Besides, the screening distances of $\mathrm{ QQq}$ and $\rm Q\bar{ Q}$ are also compared at finite rapidity and temperature. Based on the above analysis, we infer that $\rm Q\bar{ Q}$ is more stable than $\mathrm{ QQq}$ at finite rapidity and temperature.
Categories: hep-ph