Evidence for Non-Exponential Elastic Proton-Proton Differential Cross-Section at Low |t| and $\sqrt{s}$ = 8 TeV by TOTEM
- Antchev, G.
- Aspell, P.
- Atanassov, I.
- Avati, V.
- Baechler, J.
- Berardi, V.
- Berretti, M.
- Bossini, E.
- Bottigli, U.
- Bozzo, M.
- Buzzo, A.
- Cafagna, F.S.
- Campanella, C.E.
- Catanesi, M.G.
- Csanád, M.
- Csörgő, T.
- Deile, M.
- De Leonardis, F.
- D'Orazio, A.
- Doubek, M.
- Eggert, K.
- Eremin, V.
- Ferro, F.
- Fiergolski, A.
- Garcia, F.
- Georgiev, V.
- Giani, S.
- Grzanka, L.
- Guaragnella, C.
- Hammerbauer, J.
- Heino, J.
- Karev, A.
- Kašpar, J.
- Kopal, J.
- Kundrát, V.
- Lami, S.
- Latino, G.
- Lauhakangas, R.
- Lippmaa, E.
- Lippmaa, J.
- Lokajíček, M.V.
- Losurdo, L.
- Lo Vetere, 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.
- Passaro, V.
- Peroutka, Z.
- Petruzzelli, V.
- Politi, T.
- Procházka, J.
- Prudenzano, F.
- 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.
DOIAbstract
The TOTEM experiment has made a precise measurement of the elastic proton-proton differential cross-section at the centre-of-mass energy $\sqrt{s}$ = 8TeV based on a high-statistics data sample obtained with the $\beta$* = 90m 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 < |t| < 0. 2GeV$^2$ with a significance greater than 7 $\sigma$. Two extended parametrisations, with quadratic and cubic polynomials in the exponent, are shown to be well compatible withthe data. Using them for the differentia...
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