Diagonal and transition magnetic moments of negative parity heavy baryons in QCD sum rules

TL;DR

This paper calculates the magnetic moments of negative parity heavy baryons using light cone QCD sum rules, revealing large moments for most baryons and small transition moments for certain neutral baryons.

Contribution

It introduces a method to remove unwanted contributions in sum rules for negative parity heavy baryons and provides numerical estimates of their magnetic moments.

Findings

Most baryons have large magnetic moments, except a few specific ones.

Transition magnetic moments between certain neutral baryons are very small.

Some transition moments are large enough to be measured in future experiments.

Abstract

Diagonal and transition magnetic moments of the negative parity, spin-1/2 heavy baryons are studied in framework of the light cone QCD sum rules. By constructing the sum rules for different Lorentz structures, the unwanted contributions coming from negative (positive) to positive (negative) parity transitions are removed. It is obtained that the magnetic moments of all baryons, except $\Lambda_b^0$, $\Sigma_c^+$ and $\Xi_c^{\prime +}$, are quite large. It is also found that the transition magnetic moments between neutral negative parity heavy $\Xi_Q^{\prime 0}$ and $\Xi_Q^0$ baryons are very small. Magnetic moments of the $\Sigma_Q \to \Lambda_Q$ and $ \Xi_Q^{\prime \pm} \to \Xi_Q^\pm$ transitions are quite large and can be measured in further experiments.