Predictions for TOTEM experiment at LHC from integral and derivative dispersion relations

TL;DR

This paper uses integral and derivative dispersion relations within Regge models to analyze proton-proton and antiproton-proton scattering data, providing predictions for TOTEM experiment measurements at LHC energies.

Contribution

It introduces a scheme for calculating corrections to the asymptotic form of derivative dispersion relations and compares different pomeron models for data description.

Findings

Regge parametrizations reproduce low-energy $ ho$ data with a single free parameter.

Three pomeron models yield similar fits for energies above 5 GeV.

Predictions for TOTEM cross sections and $ ho$ at 7 and 14 TeV are provided.

Abstract

Integral and derivative dispersion relations (IDR and DDR) are considered for the proton-proton and antiproton-proton forward scattering amplitudes. A scheme for calculation of the corrections to asymptotic form for the DDR is presented. The data on the total proton-proton and antiproton-proton cross sections as well as the data on the ratios $\rho $ of real to imaginary part of the forward scattering amplitudes have been analyzed by the IDR and DDR methods within high-energy Regge models. Regge parametrizations of high-energy total cross sections supplemented by the properly calculated low-energy part of the dispersion integral (from the two-proton threshold up to center-of-mass energy 5 GeV) allow to reproduce well the $\rho $ data at low energies with the only free parameter, subtraction constant. It is shown that three models for the pomeron, simple pole pomeron (with intercept large than unity), tripole pomeron and dipole pomeron (the both with the unit value intercept) lead to practically equivalent description of the available data at $\sqrt{s}>$5 GeV. Predictions for the TOTEM measurements of cross section and $\rho$ at the center-of-mass energies 7 and 14 GeV are given.