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The Roper resonance, the first excited state of the nucleon, Is one of thebest-established baryon resonances. Yet, its properties have not beenconsistently explained by effective models of QCD, such as the non-relativisticquark model. In this letter, we propose an alternative approach in theSakai-Sugimoto model that is one of the holographic models of QCD. Inparticular, we analyze the helicity amplitude of the electromagnetictransitions at the leading of 't~Hooft coupling $1/\lambda$. The modelincorporates baryon structure at short distance by non-linear mesons surroundedby meson clouds at long distance. We demonstrate that the recently observeddata by CLAS are explained in the present approach.

Electromagnetic transition amplitude for Roper resonance from holographic QCD