Characterisation of the dip-bump structure observed in proton-proton elastic scattering at $\sqrt{s}$ = 8 TeV

Abstract

The TOTEM collaboration at the CERN LHC has measured the differential cross-section of elastic proton-proton scattering at $\sqrt{s}=8\mathrm{TeV}$ in the squared four-momentum transfer range $0.2\mathrm{Ge}{\mathrm{V}}^2<|t|<1.9\mathrm{Ge}{\mathrm{V}}^2$. This interval includes the structure with a diffractive minimum ("dip") and a secondary maximum ("bump") that has also been observed at all other LHC energies, where measurements were made. A detailed characterisation of this structure for $\sqrt{s}=8\mathrm{TeV}$ yields the positions, $|t{|}_{\mathrm{dip}}=(0.521\pm 0.007)\mathrm{Ge}{\mathrm{V}}^2$ and $|t{|}_{\mathrm{bump}}=(0.695\pm 0.026)\mathrm{Ge}{\mathrm{V}}^2$, as well as the cross-section values, ${\mathrm{d}\ddot{I}ƒ/\mathrm{d}t}_{\mathrm{dip}}=(15.1\pm 2.5)\hat{\mathrm{I}}¼b/Ge{\mathrm{V}}^2$ and ${\mathrm{d}\ddot{I}ƒ/\mathrm{d}t}_{\mathrm{bump}}=(29.7\pm 1.8)\hat{\mathrm{I}}¼b/Ge{\mathrm{V}}^2$, for the dip and the bump, respectively.