Neetika Sharma

Magnetic moments of the low-lying \(\tfrac{1} {2}^ -\) octet baryon resonances

Abstract.The magnetic moments of the negative-parity octet resonances with spin

Magnetic moments of the low-lying JP = 1/2-, 3/2-

\tfrac{1} {2}

resonances within the framework of the chiral quark model

: N*(1535), N*(1650), Σ* (1620), and Ξ* (1690) have been calculated within the framework of the chiral constituent quark model. In this approach, the presence of the polarized

\frac{\boldsymbol{1}}{\boldsymbol 2}^{\boldsymbol +}

q\bar q

\frac{\boldsymbol{3}}{\boldsymbol 2}^{\boldsymbol +}

pairs (or the meson cloud, in other words) is considered by using the Lagrangian for Goldstone boson emission from the constituent quarks. Further, the explicit contributions coming from the spin and orbital angular momentum, including the effects of the configurations mixing between the states with different spins, are obtained. The motivation for these calculations comes from the recent interest in the experimental measurement of the magnetic moment of the S11 (1535) resonance and of similar calculations being done within lattice quantum chromodynamics approaches. Our results can be compared with those expected to come from these sources.

, and spin-

We present a numerical analysis of helicity independent nucleon generalized parton distributions (GPDs) using the known formalism based on inclusion of higher Fock states in the soft-wall approach of the anti-de Sitter/QCD model. We calculate the momentum space GPDs by matching the electromagnetic form factors in the AdS model to the sum rules in QCD. We investigate their Mellin moments, transverse impact parameter GPDs, transverse mean square radius, and transverse width. We further extend this work to investigate the charge and anomalous magnetization densities for both unpolarized and transversely polarized nucleons. A comparison of results on density functions with phenomenological parametrization is also presented.