Eur. Phys. J. A (2015) 51: 125
https://doi.org/10.1140/epja/i2015-15125-9

Regular Article - Theoretical Physics

Final-state interaction correction to the electromagnetic nucleon form factors in the time-like region

Institut de Physique Nucléaire d’Orsay (UMR 8608), IN2P3-CNRS, Université de Paris-Sud, 91406, Orsay Cedex, France

^* e-mail: vandewi@ipno.in2p3.fr

Received: 30 June 2015
Revised: 28 August 2015
Accepted: 15 September 2015
Published online: 13 October 2015

Abstract

We study the strong energy dependence of the proton electromagnetic form factors in the time-like region, taking into account the one-pion-exchange final-state interaction in a covariant way. This effect is quantified in terms of the corrected Dirac F ₁ and Pauli F ₂ form factors and in the commonly used electric G _E and magnetic G _M ones. Our results on the ratio |G _E /G _M depend only on the values of two free parameters and allow significant comparisons with the BaBar data.