Elastic double diffractive production of axial-vector χc (1+ +) mesons and the Landau-Yang theorem
Summary, in English
We discuss exclusive elastic double diffractive axial-vector χc (1+) meson production in proton-antiproton collisions at the Tevatron. The amplitude for the process is derived within the kt-factorization 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 χc (1+) and χc (0+). The contribution of χc (1+) to the J / Ψ + γ channel is smaller than that of the χc (0+) decay, but not negligible and can be measured. The numerical value of the ratio of the both contributions is much less dependent on the UGDFs modeling than the cross sections themselves.
Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics
- ISSN: 0370-2693