Elastic double diffractive production of axial-vector \chi_c(1^{++}) mesons and the Landau-Yang theorem
Abstract
We discuss exclusive elastic double diffractive axial-vector \chi_c(1^{+}) meson production in proton-antiproton collisions at the Tevatron. The amplitude for the process is derived within the k_t-factorisation approach with unintegrated gluon distribution functions (UGDFs). We show that the famous Landau-Yang theorem is not applicable in the case of off-shell gluons. Differential cross sections for different UGDFs are calculated. We compare exclusive production of \chi_c(1^+) and \chi_c(0^+). The contribution of \chi_c(1^+) to the J/\Psi + \gamma channel is smaller than that of the \chi_c(0^+) decay, but not negligible and can be measured. The numerical value of the ratio of the both contributions is almost independent of UGDFs modeling.
Keywords
Cite
@article{arxiv.0901.4187,
title = {Elastic double diffractive production of axial-vector \chi_c(1^{++}) mesons and the Landau-Yang theorem},
author = {R. S. Pasechnik and A. Szczurek and O. V. Teryaev},
journal= {arXiv preprint arXiv:0901.4187},
year = {2009}
}
Comments
14 pages, 5 figures, a numerical error corrected, discussions extended, conclusions unchanged