Characterisation of the dip-bump structure observed in proton\u2013proton elastic scattering at sqrt{s} = 8\xa0TeV

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{GeV^{2}}< |t| < 1.9,mathrm{GeV^{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{GeV^2} and |t|_{mathrm{bump}} = (0.695 pm 0.026),mathrm{GeV^2}, as well as the cross-section values, left. {mathrm{d}sigma /mathrm{d}t}right| _{mathrm{dip}} = (15.1 pm 2.5),mathrm{{mu b/GeV^2}} and left. {mathrm{d}sigma /mathrm{d}t}right| _{mathrm{bump}} = (29.7 pm 1.8),mathrm{{mu b/GeV^2}}, for the dip and the bump, respectively.