Elastic proton-proton scattering at 13 TeV

The predictions of a model which was tuned in 2013 to describe the elastic and diffractive $pp$- and/or $p\overline{p}$-data at collider energies up to 7 TeV are compared with the new 13 TeV TOTEM results. The possibility of the presence of an odd-signature Odderon exchange contribution is discussed.

Figure 1

The dependence of the $pp$ (or $p\overline{p}$) elastic cross section on the momentum transferred square $t$ compared with the present data (see [5] for references), and the prediction for $\sqrt{s}=13\mathrm{TeV}$. The continuous curves correspond to the original model [4, 5], whereas the dashed curves show the effect of including an Odderon contribution as described in the text. The 13 TeV data are from [3].

Figure 2

The energy dependence of the $\rho =\mathrm{Re}A/\mathrm{Im}A$ ratio. The data are taken from [2, 3, 20, 21]; the first two data points correspond to $p\overline{p}$ scattering and the last points to $pp$ scattering. At 13 TeV we also show by the open square the value of $\rho$ obtained under the same conditions as that used by the $\mathrm{UA}4/2$ group (see footnote 1). The values of $\rho$ given by the model [4] are shown by the solid curve. The dashed curves include a possible QCD Odderon contribution calculated as described in the text.