Elastic double diffractive production of axial-vector χ_c(1^{++}) mesons and the Landau-Yang theorem

Details Elastic double diffractive production of axial-vector χ_c(1^{++}) mesons and the Landau-Yang theorem Elastic double diffractive production of axial-vector χ_c(1^{++}) mesons and the Landau-Yang theorem

2009-01-27

arxiv.org/abs/0901.4187v2

Phys.Lett.B680:62-71,2009

Physics

High Energy Physics

High Energy Physics - Phenomenology

14 pages, 5 figures, a numerical error corrected, discussions extended, conclusions unchanged

Scientific paper

10.1016/j.physletb.2009.08.035

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.

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