Valence quark contributions for the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>γ</mml:mi><mml:mi>N</mml:mi><mml:mo>→</mml:mo><mml:msub><mml:mi>P</mml:mi><mml:mn>11</mml:mn></mml:msub><mml:mo stretchy="false">(</mml:mo><mml:mn>1440</mml:mn><mml:mo stretchy="false">)</mml:mo></mml:math>form factors
Journal: Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D, Particles, fields, gravitation, and cosmology
Year: 2010

Using a covariant spectator quark model we estimate valence quark contributions to the ${F}_{1}^{*}({Q}^{2})$ and ${F}_{2}^{*}({Q}^{2})$ transition form factors for the $\ensuremath{\gamma}N\ensuremath{\rightarrow}{P}_{11}(1440)$ reaction. The Roper resonance, ${P}_{11}(1440)$, is assumed to be the first radial excitation of the nucleon. The present model requires no extra parameters except for those already fixed by previous studies of the nucleon. Our results are consistent with the experiment