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arXiv · 2601.07323

Probing the spin parity structure of hidden charm pentaquarks from spectroscopy and magnetic moments

Pallavi Gupta
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Abstract

We investigate the spin parity JP assignments of experimentally observed hidden charm pentaquark states within a baryon meson molecular framework. The pentaquark mass spectrum is obtained using the Gursey Radicati mass formula, with parameters fixed through a global fit to 41 experimentally established hadron masses. The resulting spectrum is then used to assign JP quantum numbers to the observed pentaquark candidates. Within this framework, the nonstrange states Pc 4312, Pc4440, and Pc 4457 are identified with the JP = 1/2, 3/2, and 5/2 configurations, respectively. The recently reported Belle state Pcs4459, which carries strangeness, is interpreted as the strange member of the SU3 flavor octet with JP = 3/2. Magnetic moments are subsequently evaluated using explicitly constructed wave functions. Their systematic behavior across SU3 flavor multiplets and different spin parity assignments satisfies the expected sum-rule relations and indicates that magnetic moments can serve as a useful observable for refining the quantum-number identification of hidden charm pentaquark states in future studies.

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Pallavi Gupta. 2026-01-12. Probing the spin parity structure of hidden charm pentaquarks from spectroscopy and magnetic moments. https://doi.org/10.1103/b7ry-sr11

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