Evidence for non-exponential elastic proton–proton differential cross-section at low |t| and s=8TeV by TOTEM
oleh: G. Antchev, P. Aspell, I. Atanassov, V. Avati, J. Baechler, V. Berardi, M. Berretti, E. Bossini, U. Bottigli, M. Bozzo, P. Broulím, A. Buzzo, F.S. Cafagna, C.E. Campanella, M.G. Catanesi, M. Csanád, T. Csörgő, M. Deile, F. De Leonardis, A. D'Orazio, M. Doubek, K. Eggert, V. Eremin, F. Ferro, A. Fiergolski, F. Garcia, V. Georgiev, S. Giani, L. Grzanka, C. Guaragnella, J. Hammerbauer, J. Heino, A. Karev, J. Kašpar, J. Kopal, V. Kundrát, S. Lami, G. Latino, R. Lauhakangas, R. Linhart, E. Lippmaa, J. Lippmaa, M.V. Lokajíček, L. Losurdo, M. Lo Vetere, F. Lucas Rodríguez, M. Macrí, A. Mercadante, N. Minafra, S. Minutoli, T. Naaranoja, F. Nemes, H. Niewiadomski, E. Oliveri, F. Oljemark, R. Orava, M. Oriunno, K. Österberg, P. Palazzi, L. Paločko, V. Passaro, Z. Peroutka, V. Petruzzelli, T. Politi, J. Procházka, F. Prudenzano, M. Quinto, E. Radermacher, E. Radicioni, F. Ravotti, E. Robutti, L. Ropelewski, G. Ruggiero, H. Saarikko, A. Scribano, J. Smajek, W. Snoeys, T. Sodzawiczny, J. Sziklai, C. Taylor, N. Turini, V. Vacek, J. Welti, P. Wyszkowski, K. Zielinski
| Format: | Article |
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| Diterbitkan: | Elsevier 2015-10-01 |
Deskripsi
The TOTEM experiment has made a precise measurement of the elastic proton–proton differential cross-section at the centre-of-mass energy s=8 TeV based on a high-statistics data sample obtained with the β⁎=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<|t|<0.2 GeV2 with a significance greater than 7 σ. 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.