Hard diffractive electroproduction of two pions
High Energy Physics - Phenomenology
2009-10-31 v2
Abstract
We have calculated the leading order amplitude of hard diffractive electroproduction of two pions in lepton nucleon scattering. At the leading twist level a pion pair can be produced only in an isospin one or zero state. We have shown that isoscalar states are produced dominantly for x_{Bj}>0.3 and with an invariant mass of the two pions close to the threshold (S-wave) and in the f_2 resonance region (D-wave). These isoscalar pion pairs are dominantly produced by two collinear gluons. Comparing the production of charged and neutral pion pairs as a function of x_{Bj} and m_pipi one can get information about the gluonic component of two-pion distribution amplitudes.
Keywords
Cite
@article{arxiv.hep-ph/9910310,
title = {Hard diffractive electroproduction of two pions},
author = {B. Lehmann-Dronke and P. V. Pobylitsa and M. V. Polyakov and A. Schafer and K. Goeke},
journal= {arXiv preprint arXiv:hep-ph/9910310},
year = {2009}
}
Comments
Estimates of angular distributions are added