LHC optics and elastic scattering measured by the TOTEM experiment

The TOTEM experiment at the LHC has measured proton-proton elastic scattering in dedicated runs at <img src="/na101/home/literatum/publisher/wspc/books/content/books/2017/10561/9789813224568_0039/20170419/images/eqs/eq-00001.gif" alt="" /> = 7 and 8 TeV centre-of-mass LHC energies. The proton-proton total cross-section σ_tot has been derived for both energies using a luminosity independent method. TOTEM has excluded a purely exponential differential cross-section for elastic proton-proton scattering with significance greater than 7σ in the |t| range from 0.027 to 0.2 GeV² at <img src="/na101/home/literatum/publisher/wspc/books/content/books/2017/10561/9789813224568_0039/20170419/images/eqs/eq-00002.gif" alt="" /> = 8 TeV.