Exclusive Double Diffractive Events: general framework and prospects

We consider the general theoretical framework to study exclusive double diffractive events (EDDE). It is a powerful tool to study the picture of the $pp$ interaction. Basic kinematical and dynamical properties of the process, and also normalization of parameters via standard processes like the exclusive vector meson production (EVMP), are considered in detail. As an example, calculations of the cross-sections in the model with three pomerons for the process $p+p\to p+M+p$ are presented for Tevatron and LHC energies.Comment: 15 pages, 13 figures, Appendixes are added, minimal changes in the text to improve the paper, to be published in Eur.Phys.J.

Visualizations of the Exclusive Central Diffraction

The case of the low invariant mass exclusive central diffractive production is considered in the general theoretical framework. It is shown that diffractive patterns (differential cross-sections on variables like transfer momenta squared, the azimuthal angle between final hadrons and their combinations) can serve as a unique tool to explore the picture of the $pp$ interaction and falsify theoretical models. Basic kinematical and dynamical properties of the process are considered in detail. As an example, visualizations of diffractive patterns in the model with three pomerons for processes $p+p\to p+R+p$ and $p+p\to p+\pi^{+}\pi^{-}+p$ are presented.Comment: 12 pages, 8 figures, minor corrections in the text, 1 reference has been adde

Total pion-proton cross-section from the new LHCf data on leading neutrons spectra

In the light of the latest data by LHCf collaboration of the LHC on leading neutrons spectra it is possible to obtain total pion-proton cross-sections in the TeV energy region. In this work the exact extraction procedure is shown. Final numbers for the pion-proton cross-section are collected at several different values of the colliding energy and compared with some popular theoretical predictions. Errors of results are estimated.Comment: 5 pages, 6 figures, 1 table, results of this version are more correct than in the version 2. Figs 3, 6 and Table 1 are changed. Minor changes in the text. One reference is added. Erratum is sent to the EPJ

Patterns of the Exclusive Double Diffraction

We consider Exclusive Double Diffractive Events (EDDE) as a powerfull tool to study the picture of the $pp$ interaction. Calculations of the cross-sections for the process $p+p\to p+M+p$ are presented in the convenient form for further experimental applications. We propose measurements of t-distributions in the joint CMS-TOTEM experiment. It is shown that important information on the interaction region could be extracted from the diffractive pattern.Comment: 12 pages, 7 figures, to be publishe