2022/09/23 by H. Stenzel, Stenzel, Hasko
Physics and Astronomy · #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions
paper · pdf · doi:10.48550/arxiv.2209.11487
A new measurement of elastic pp scattering at √(s) = 13 TeV with the ATLAS-ALFA detector is presented. The measurement was performed using data recorded in a special run of the LHC with β^⋆ = 2.5 km. The elastic cross-section was measured differentially in the Mandelstam t variable and from a fit to \textrmdσ/\textrmdt the total cross section, the ρ-parameter and parameters of the nuclear slope are determined. The results for σ_\textrmtot and ρ are σ_\textrmtot(pp→ X) = 104.7 ± 1.1 mb , ρ= 0.098 ± 0.011 . The energy evolution of σ_\textrmtot and ρ, connected through dispersion relations, is compared to several models. Furthermore, the total inelastic cross section is determined from the difference of the total and elastic cross section, and the ratio of the elastic to total cross section is calculated.