Central exclusive diffractive production of axial-vector and mesons in proton-proton collisions
arXiv:2008.07452 · doi:10.1103/PhysRevD.102.114003
Abstract
We present a study of the central exclusive diffractive production of the and resonances in proton-proton collisions. The theoretical results are calculated within the tensor-pomeron approach. Two pomeron-pomeron- tensorial couplings labeled by and are derived. We adjust the model parameters (coupling constants, cutoff constant) to the WA102 experimental data taking into account absorption effects. Both the and couplings separately allow one to describe the WA102 differential distributions. We compare these predictions with those of the Sakai-Sugimoto model, where the pomeron-pomeron- couplings are determined by the mixed axial-gravitational anomaly of QCD. We derive an approximate relation between the pomeron-pomeron- coupling constants of this approach and the and couplings. Then we present our predictions for the energies available at the RHIC and LHC. The total cross sections and several differential distributions are presented. Analysis of the distributions in the azimuthal angle between the transverse momenta of the outgoing protons may be used to disentangle - and -type resonances contributing to the same final channel. We find for the a total cross section b for TeV and a rapidity cut on the of . We predict a much larger cross section for production of than for production of in the decay channel for the LHC energies. This opens a possibility to study the meson in experiments planned at the LHC.
47 pages, 13 figures
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- Study of the exclusive reaction : resonance versus diffractive continuum
- Exclusive meson production for energy ranges available at the GSI-FAIR with HADES and PANDA
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- Deeply virtual Compton scattering in the tensor-pomeron approach
- Charged pions asymmetry from the decay of light neutral axial mesons due to interference