Double diffractive cross-section measurement in the forward region at LHC

Antchev1, G.; Aspell2, P.; Atanassov1, I.; 2,; Avati2, V.; Baechler2, J.; Berardi3, V.; 4,; Berretti5, M.; 6,; Bossini5, E.; 6,; Bottigli6, U.; Bozzo, Marco; 8,; Brücken9, E.; 10,; Buzzo7, A.; Cafagna3, F. S.; Catanesi3, M. G.; Covault11, C.; Csanád12, M.; †,; Csörgő12, T.; Deile2, M.; Eggert11, K.; Eremin13, V.; Ferro, Fabrizio; Fiergolski3, A.; 14,; Garcia9, F.; Giani2, S.; Greco6, V.; Grzanka2, L.; ‡,; Heino9, J.; Hilden9, T.; 10,; Karev2, A.; Kašpar2, J.; 15,; Kopal2, J.; 15,; Kundrát15, V.; Kurvinen9, K.; Lami5, S.; Latino6, G.; Lauhakangas9, R.; Leszko14, T.; Lippmaa16, E.; Lippmaa16, J.; Lokajíček15, M.; Losurdo6, L.; LO VETERE, Maurizio; Lucas Rodríguez2, F.; Macrí7, M.; Mäki9, T.; §,; Mercadante3, A.; Minafra3, N.; 4,; Minutoli2, S.; 7,; Nemes12, F.; †,; Niewiadomski6, H.; Oliveri6, E.; Oljemark9, F.; 10,; Orava9, R.; 10,; Oriunno2, M.; **,; Österberg9, K.; 10,; Palazzi6, P.; Procházka15, J.; Quinto3, M.; 4,; Radermacher6, E.; Radicioni3, E.; Ravotti2, F.; Robutti, E.; Ropelewski2, L.; Ruggiero2, G.; Saarikko9, H.; 10,; Scribano6, A.; Smajek2, J.; Snoeys2, W.; Sziklai12, J.; Taylor11, C.; Turini6, N.; Vacek17, V.; Vítek17, M.; Welti9, J.; 10,; Whitmore18, J.; Wyszkowski2, P.; ††,

doi:10.1103/PhysRevLett.111.262001

The first double diffractive cross-section measurement in the very forward region has been carried out by the TOTEM experiment at the LHC with a center-of-mass energy of root s = 7 TeV. By utilizing the very forward TOTEM tracking detectors T1 and T2, which extend up to vertical bar eta vertical bar = 6.5, a clean sample of double diffractive pp events was extracted. From these events, we determined the cross section sigma(DD) = (116 +/- 25) mu b for events where both diffractive systems have 4.7 < vertical bar eta vertical bar(min) < 6.5.