Tensor pomeron, vector odderon and diffractive production of meson and baryon pairs in proton-proton collisions

Abstract

We review some selected results of the tensor-pomeron and vector-odderon model of soft high-energy proton-proton scattering and central exclusive production of meson and baryon pairs in proton-proton collisions. We discuss the theoretical aspects of this approach and consider the phenomenological implications in a variety of processes at high energies, comparing to existing experimental data. We consider the diffractive dipion and dikaon production including the continuum and the dominant scalar and tensor resonance contributions as well as the photoproduction processes. The theoretical results are compared with existing CDF experimental data and predictions for planned or current LHC experiments, ALICE, ATLAS, CMS, LHCb are presented. ⋆

Central exclusive diffractive production of two-pion continuum at hadron colliders

“…In the next section one can see that there are some difficulties in the data fitting, which have also been presented in other works [10]- [12]. In this subsection let us discuss some nuances of calculations, which could change the situation.…”

“…1), they take the Born Regge term for the amplitude of the process p + p → p + π + + π − + p with reggeized propagator of the off-shell pion, then they take into account unitarity (rescattering) corrections (in the initial proton-proton state and also in so-called "enhanced" one). In articles [10]- [12] authors do not introduce "enhanced" corrections, but take into account pion-proton interactions in the final state (see Fig. 2).…”

Forward elastic scattering: dynamical gluon mass and semihard interactions

“…(26), has a component which increases with the energy, namely the term with coefficient C. In the second case, the dipole form factor G SH (s, k ⊥ ; ν SH ), Eqs. (19) and (20), also depends on the energy through the logarithmic. The effect of these terms can be investigated by assuming either C = 0 or ν 2 = 0 and re-fitting the dataset.…”

“…Specifically, we fix ν 2 = 0 in Eq. (20), so that ν SH = ν 1 and refit the data set. As illustration, we consider the highenergy cutoff at 13 TeV and the three PDFs employed in this work.…”

“…• Pomeron dominance with small Odderon contribution (e.g., Khoze, Martin, Ryskin [17], Gotsman, Levin, Potashnikova [18,19], Lebiedowicz, Nachtmann, Szczurek [20], Bence, Jenkovszky, Szanyi [21]); arXiv:1906.05932v1 [hep-ph] 13 Jun 2019…”