POLE APPROXIMATION FOR PION ELECTROMAGNETIC FORM FACTOR WITHIN LIGHT-FRONT DYNAMICS
/ Authors
J. Melo, J. S. Veiga, T. Frederico, E. Pace, G. Salmè, Cetec, Universidade Cruzeiro do Sul, Unicsul, Ift, Unesp
and 9 more authors
Brazil, Ita, Cta, S. J. Campos, U. Vergata, Romé, Italy., Infn, Universita' La Sapienza
/ Abstract
Instituto de F´isica Te´orica, Universidade Estadual Paulista, 01405-900, S˜ao Paulo,SP, BrazilT. FredericoDepartamento de F´isica, Instituto Tecnol´ogico de Aeron´autica,12228-900, S˜ao Jos´e dos Campos, SP, BrazilE. PaceDipartimento di Fisica, Universit`a di Roma ”Tor Vergata” and Istituto Nazionale diFisica Nucleare, Sezione Tor Vergata, Via della Ricerca Scientifica 1, I-00133, Roma,ItalyG. Salm´eIstituto Nazionale di Fisica Nucleare, Sezione Roma I, P.le A. Moro 2, I-00185,Roma, ItalyWe carefully investigate the reliability of the propagator Pole Approximation,i.e. the approximation of retaining only the propagator poles in the evaluationof the Mandelstam covariant expression for the electromagnetic current of thepion. Different frames are analyzed, in order to find the most suitable onefor calculating the pion form factor within the proposed approximation. Itturns out that the approximation is more accurate in the frame where q
Journal: arXiv: High Energy Physics - Phenomenology