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

A Türkan,G Bozkır,K Azizi

doi:10.1103/physrevd.104.094029

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.

Highlights

One of the most attractive subjects in particle physics is to investigate the spectroscopic properties of hadrons at finite temperatures
Such studies provide us with a better understanding of the perturbative and nonperturbative natures of QCD at hot mediums. They will help us in analyses of data provided by future heavy ion collision experiments aiming to investigate the hadronic properties and possible phase transitions to quark-gluon plasma (QGP) at finite temperatures and densities
The essential objective of this study is to extend our previous work on the thermal properties of the spin-3=2 heavy baryons at nonzero temperature [47] and investigate the shifts on the mass and residue of the spin-1=2 heavy ΛQ, ΞQ, ΣQ, Ξ0Q, and ΩQ baryons with respect to temperature using the thermal QCD sum rule method (TQCDSR) method

Summary

INTRODUCTION

One of the most attractive subjects in particle physics is to investigate the spectroscopic properties of hadrons at finite temperatures Such studies provide us with a better understanding of the perturbative and nonperturbative natures of QCD at hot mediums. They will help us in analyses of data provided by future heavy ion collision experiments aiming to investigate the hadronic properties and possible phase transitions to quark-gluon plasma (QGP) at finite temperatures and densities. All single heavy baryons containing a heavy b or c quark have been successfully observed [1] The investigation of these baryons at a medium with nonzero temperature is a very prominent research subject and it will be in the agenda of different experimental and theoretical studies. Ω−bððc0ÞÞ s s last section is devoted to both the summary of the results and our concluding remarks

THERMAL QCD SUM RULE CALCULATIONS

NUMERICAL RESULTS

SUMMARY AND CONCLUSIONS

B ΓQ1 CD