Electromagnetic transition form factors of baryon resonances

Ramalho, G.; Peña, M.T.

doi:10.1016/j.ppnp.2024.104097

Progress in Particle and Nuclear Physics

2024

DOI: 10.1016/j.ppnp.2024.104097

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Electromagnetic transition form factors of baryon resonances

G. Ramalho,

M.T. Peña

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2024

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Cited by 13 publications

References 471 publications

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Resonance contributions to nucleon spin structure in holographic QCD

Bigazzi,

Castellani

2024

J. High Energ. Phys.

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We study polarized inelastic electron-nucleon scattering at low momentum transfer in the Witten-Sakai-Sugimoto model of holographic QCD, focusing on resonance production contributions to the nucleon spin structure functions. Our analysis includes both spin 3/2 and spin 1/2 low-lying nucleon resonances with positive and negative parity. We determine, in turn, the helicity amplitudes for nucleon-resonance transitions and the resonance contributions to the neutron and proton generalized spin polarizabilities. Extrapolating the model parameters to realistic QCD data, our analysis, triggered by recent experimental results from Jefferson Lab, agrees with the observation that the ∆(1232) resonance gives the dominant contribution to the forward spin polarizabilities at low momentum transfer. The contribution is negative and tends to zero as the momentum transfer increases. As expected, the contribution of the ∆(1232) to the longitudinal-transverse polarizabilities is instead negligible. The latter, for both nucleons, turn out to be negative functions with zero asymptote. The holographic results, at least for the proton where enough data are available, are in qualitative agreement with the resonance contributions to the spin polarizabilities extracted from experimental data on the helicity amplitudes.

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Resonance contributions to nucleon spin structure in holographic QCD

Bigazzi,

Castellani

2024

J. High Energ. Phys.

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Dynamical Diquarks and Baryon Transition Form Factors

Raya,

Segovia

2023

Few-Body Syst

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Method for measuring the charge radii of charged hyperons from the time-like region

Lin,

Guo,

Meißner

2024

Physics Letters B

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Electromagnetic transition form factors of baryon resonances

Cited by 13 publications

References 471 publications

Resonance contributions to nucleon spin structure in holographic QCD

Resonance contributions to nucleon spin structure in holographic QCD

Dynamical Diquarks and Baryon Transition Form Factors

Method for measuring the charge radii of charged hyperons from the time-like region

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