Properties of spin-1/2 heavy baryons at nonzero temperature

TL;DR

This study investigates how the masses and residues of heavy spin-1/2 baryons change with temperature using thermal QCD sum rules, revealing stability up to certain temperatures and melting near the pseudo-critical temperature.

Contribution

It provides a detailed analysis of the temperature dependence of heavy baryon properties, including contributions from non-perturbative operators and Lorentz invariance breaking effects.

Findings

Mass remains stable up to ~108 MeV

Residue remains unchanged up to ~93 MeV

Baryons melt near the pseudo-critical temperature

Abstract

The spectroscopic properties of single heavy spin-1/2 $\Lambda_{Q}$, $\Sigma_{Q}$, $\Xi^{(\prime)}_{Q}$ and $ \Omega_{Q}$ baryons are investigated at finite temperature in the framework of thermal QCD sum rule. We discuss the behavior of the mass and residue of these baryons with respect to temperature taking into account contributions of non-perturbative operators up to dimension eight. We include additional operators coming from the Wilson expansion due to breaking the Lorentz invariance at non-zero temperature. The obtained results show that the mass of these baryons remain stable up to roughly $T=108$ MeV while their residue are unchanged up to $T=93$ MeV. After these points, the mass and residue start to diminish by increasing the temperature. The shifts in the mass and residue for both the bottom and charm channels are considerably large and we observe the melting of these baryons near to the pseudo-critical temperature determined by recent lattice QCD calculations. We present our results for the mass of these baryons with both the positive and negative parity at $ T\rightarrow 0 $ limit, which are consistent with the existing theoretical predictions as well as experimental data.