Updating an empirical analysis on the proton's central opacity and asymptotia

8th International Workshop on Hadron Physics

Fagundes, D.A.^1,2 ; Menon, M.J.^3 ; Silva, P.V.R.G.^3

Universidade Federal de Santa Catarina, Campus Blumenau, Rua Pomerode, 710, Salto do Norte, Blumenau, SC

89065-300, Brazil^1

Instituto de Física Teórica - UNESP, 271, Rua Dr. Bento T. Ferraz, São Paulo, SP

01140-070, Brazil^2

Instituto de Física Gleb Wataghin, Universidade Estadual de Campinas, Campinas, SP

13083-859, Brazil^3

关键词: Asymptotic ratios;    Empirical analysis;    Energy interval;    Fit parameters;    Inelastic cross sections;    Parametrizations;    Upper Bound;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/706/5/052027/pdf
DOI  :  10.1088/1742-6596/706/5/052027

来源: IOP

【 摘 要 】

We present an updated empirical analysis on the ratio of the elastic (integrated) to the total cross section in the c.m. energy interval from 5 GeV to 8 TeV. As in a previous work, we use a suitable analytical parametrization for that ratio (depending on only four free fit parameters) and investigate three asymptotic scenarios: either the black disk limit or scenarios above or below that limit. The dataset includes now the datum at 7 TeV, recently reported by the ATLAS Collaboration. Our analysis favors, once more, a scenario below the black disk, providing an asymptotic ratio consistent with the rational value 1/3, namely a gray disk limit. Upper bounds for the ratio of the diffractive (dissociative) to the inelastic cross section are also presented.