Evidence for Non-Exponential Elastic Proton-Proton Differential Cross-Section at Low |t| and $\sqrt{s}$ = 8 TeV by TOTEM

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%...

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Detalles Bibliográficos
Autores principales: 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.
Lenguaje:eng
Publicado: 2015
Materias:
Particle Physics - Experiment
Acceso en línea:https://dx.doi.org/10.1016/j.nuclphysb.2015.08.010
http://cds.cern.ch/record/2002559
Descripción
Sumario: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 differential cross-section extrapolation to t = 0, and further applying the optical theorem, yields total cross-section estimates of (101.5 $\pm$ 2.1) mb and (101.9 $\pm$ 2.1) mb, respectively, in agreement with previous TOTEM measurements.

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