Mass spectra of the heavy baryons Lambda_Q and Sigma_Q^(*) from QCD sum rules

TL;DR

This paper employs QCD sum rules to calculate the masses of heavy baryons Lambda_Q and Sigma_Q^(*), including operators up to dimension six, and finds results consistent with experimental data.

Contribution

It provides the first comprehensive mass calculations of Lambda_Q and Sigma_Q^(*) baryons using QCD sum rules with higher-dimension operator contributions.

Findings

Calculated baryon masses agree with experimental values.

Operators up to dimension six are included in the analysis.

Provides theoretical support for heavy baryon mass predictions.

Abstract

We use QCD sum rule approach to calculate the masses of the ground-state Lambda_Q and Sigma_Q^(*) baryons. Contributions of the operators up to dimension six are included in operator product expansion. The resulting heavy baryonic masses from the calculations are m_{Lambda_b}=5.69 +/- 0.13 GeV, and m_{Lambda_c}=2.31 +/- 0.19 GeV for Lambda_Q; m_{Sigma_b}=5.73 +/- 0.21 GeV, m_{Sigma_b^*}=5.81 +/- 0.19 GeV, m_{Sigma_c}=2.40 +/- 0.31 GeV and m_{Sigma_c^*}=2.56 +/- 0.24 GeV for Sigma_Q^(*), respectively, which are in good agreement with the experimental values.