title: 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
abstract: 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
journal: Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D, Particles, fields, gravitation, and cosmology