Evidence for non-exponential elastic proton–proton differential cross-section at low |t|and √s=8 TeVbyTOTEM

Antchev, G.; Aspell, P.; Atanassov, I.; Avati, V.; Baechler, J.; Berardi, Vincenzo; Berretti, M.; Bossini, E.; Bottigli, U.; Bozzom, M.; Broulím, P.; Buzzom, A.; Cafagna, F. S.; Campanella, C. E.; Catanesi, M. G.; Csanád, M.; Csörgo, T.; Deile, M.; De Leonardis, Francesco; D'Orazio, Antonella; Doubek, M.; Eggert, K.; Eremin, V.; Ferro, F.; Fiergolski, A.; Garcia, F.; Georgiev, V.; Giani, S.; Grzanka, L.; Guaragnella, Cataldo; Hammerbauer, J.; Heino, J.; Karev, A.; Kašpar, J.; Kopal, J.; Kundrát, V.; Lami, S.; Latino, G.; Lauhakangas, R.; Linhart, R.; Lippmaa, E.; Lippmaa, J.; Lokajícek, M. V.; Losurdo, L.; Lovetere, M.; Lucas Rodríguez, F.; Macrí, M.; Mercadante, A.; Minafra, N.; Minutoli, S.; Naaranoja, T.; Nemes, F.; Niewiadomski, H.; Oliveri, E.; Oljemark, F.; Orava, R.; Oriunno, M.; Österberg, K.; Palazzi, P.; Palocko, L.; Passaro, Vittorio; Peroutka, Z.; Petruzzelli, Vincenzo; Politi, Tiziano; Procházka, J.; Prudenzano, Francesco; Quinto, M.; Radermacher, E.; Radicioni, E.; Ravotti, F.; Robutti, E.; Ropelewski, L.; Ruggiero, G.; Saarikko, H.; Scribano, A.; Smajek, J.; Snoeys, W.; Sodzawiczny, T.; Sziklai, J.; Taylor, C.; Turini, N.; Vacek, V.; Welti, J.; Wyszkowski, P.; Zielinski, K.

doi:10.1016/j.nuclphysb.2015.08.010

The TOTEM experiment has made a precise measurement of the elastic proton proton differential cross-section at the centre-of-mass energy root s = 8 TeV based on a high-statistics data sample obtained with the beta* = 90 m optics. Both the statistical and systematic uncertainties remain below 1%, except for the t-independent contribution from the overall normalisation. This unprecedented precision allows to exclude a purely exponential differential cross-section in the range of four-momentum transfer squared 0.027 < vertical bar t vertical bar < 0.2 GeV2 with a significance greater than 7 sigma. Two extended parametrisations, with quadratic and cubic polynomials in the exponent, are shown to be well compatible with the data. Using them for the differential cross-section extrapolation to t = 0, and further applying the optical theorem, yields total cross-section estimates of (101.5 +/- 2.1) mb and (101.9 +/- 2.1) mb, respectively, in agreement with previous TOTEM measurements.

Evidence for non-exponential elastic proton–proton differential cross-section at low |t|and √s=8 TeVbyTOTEM / G., A., P., A., I., A., V., A., J., B., Berardi, V., M., B., E., B., U., B., M., B., P., B., A., B., F. S., C., C. E., C., M. G., C., M., C., T., C., M., D., DE LEONARDIS, F., D'Orazio, A., et al.. - In: NUCLEAR PHYSICS. B. - ISSN 0550-3213. - STAMPA. - 899:(2015), pp. 527-546. [10.1016/j.nuclphysb.2015.08.010]