Speaker
Description
Diffractive phenomena at the LHC are studied by several collaborations there. In this paper we present our recent results connected with the current and future studies at the LHC, namely the deviation of the exponential behavior in elastic proton-proton scattering at low values of |t| and central exclusive resonance production. Although the above phenomena occur in different kinematical regions, they are related e.g. by Regge-factorization. Deviation from the exponential behavior of the diffraction cone observed near both at the ISR and the
LHC (so-called break) follows from a two-pion loop in the -channel imposed by unitarity. By using a simple Regge-pole model we extrapolate the 'break' from the ISR energy region to that of the LHC. A model for
Pomeron-Pomeron total cross section in the resonance region is also presented.
Central production is treated in a Regge pole including the Pomeron and two different trajectories, as well as an isolated f 0 (500) resonance in the region . A slowly varying background is included. The presented Pomeron-Pomeron cross section is not directly measurable, but is an essential ingredient for calculating exclusive resonance production at the LHC.
