Predictions of the pp, pbar p total cross-section and the rho ratio at LHC and cosmic-ray energies

by Keiji Igi (RIKEN)

Friday 26 Aug 2005, 14:00 → 15:00 Europe/Zurich

TH Auditorium (CERN)

We propose to use rich information on the pp, pbar p total cross-section σ below N = 10 GeV in order to predict the total cross-section and ρ ratio at very high energies. Using the FESR as a constraint for high-energy parameters, we search for the simultaneous best fit to the data points of σ and ρ ratio up to some energy (e.g., ISR, Tevatron) to determine the high-energy parameters. We then predict σ and ρ in the LHC and high-energy cosmic-ray regions. Using the data up to √s =1.8 TeV (Tevatron), we predict σ (pp) and ρ (pp) at the LHC energy (√s = 14 TeV) as 106.3 ± 5.1(syst) ± 2.4(stat) mb and 0.126 ± 0.007(syst) ± 0.004(stat), respectively. The predicted values of σ in terms of the same parameters are in good agreement with the cosmic-ray experimental data sample up to Plab = 10^(8-9) GeV by Block, Halzen, and Stanov.