Elastic double diffractive production of axial-vector c(1++) mesons and the Landau-Yang theorem
Abstract
We discuss exclusive elastic double diffractive axial-vector c(1+) meson production in proton-antiproton collisions at the Tevatron. The amplitude for the process is derived within the kt-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 c(1+) and c(0+). The contribution of c(1+) to the J/ + γ channel is smaller than that of the 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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