The TOTEM collaboration has measured the proton-proton total cross section at root s = 8 TeV using a luminosity-independent method. In LHC fills with dedicated beam optics, the Roman pots have been inserted very close to the beam allowing the detection of similar to 90% of the nuclear elastic scattering events. Simultaneously the inelastic scattering rate has been measured by the T1 and T2 telescopes. By applying the optical theorem, the total proton-proton cross section of (101.7 +/- 2.9) mb has been determined, well in agreement with the extrapolation from lower energies. This method also allows one to derive the luminosity-independent elastic and inelastic cross sections: sigma(el) = (27.1 +/- 1.4) mb; sigma(inel) = (74.7 +/- 1.7) mb.
Luminosity-Independent Measurement of the Proton-Proton Total Cross Section at root s=8 TeV / Antchev, G; Aspell, P; Atanassov, I; Avati, V; Baechler, J; Berardi, Vincenzo; Berretti, M; Bossini, E; Bottigli, U; Bozzo, M; Brucken, E; Buzzo, A; Cafagna, F. S.; Calicchio, M; Catanesi, M. G.; Covault, C; Csanad, M; Csoergo, T; Deile, M; Doubek, M; Eggert, K; Eremin, V; Ferretti, R; Ferro, F; Fiergolski, A; Garcia, F; Giani, S; Greco, V; Grzanka, L; Heino, J; Hilden, T; Intonti, R. A.; Kaspar, J; Kopal, J; Kundrat, V; Kurvinen, K; Lami, S; Latino, G; Lauhakangas, R; Leszko, T; Lippmaa, E; Lokajicek, M; Lo Vetere, M; Rodriguez F., Lucas; Macri, M; Maki, T; Mercadante, A; Minafra, N; Minutoli, S; Nemes, F; Niewiadomski, H; Oliveri, E; Oljemark, F; Orava, R; Oriunno, M; Osterberg, K; Palazzi, P; Prochazka, J; Quinto, M; Radermacher, E; Radicioni, E; Ravotti, F; Robutti, E; Ropelewski, L; Ruggiero, G; Saarikko, H; Santroni, A; Scribano, A; Smajek, J; Snoeys, W; Sziklai, J; Taylor, C; Turini, N; Vacek, V; Vitek, M; Welti, J; Whitmore, J; Wyszkowski, P.. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - STAMPA. - 111:1(2013). [10.1103/PhysRevLett.111.012001]
Luminosity-Independent Measurement of the Proton-Proton Total Cross Section at root s=8 TeV
BERARDI, Vincenzo;
2013-01-01
Abstract
The TOTEM collaboration has measured the proton-proton total cross section at root s = 8 TeV using a luminosity-independent method. In LHC fills with dedicated beam optics, the Roman pots have been inserted very close to the beam allowing the detection of similar to 90% of the nuclear elastic scattering events. Simultaneously the inelastic scattering rate has been measured by the T1 and T2 telescopes. By applying the optical theorem, the total proton-proton cross section of (101.7 +/- 2.9) mb has been determined, well in agreement with the extrapolation from lower energies. This method also allows one to derive the luminosity-independent elastic and inelastic cross sections: sigma(el) = (27.1 +/- 1.4) mb; sigma(inel) = (74.7 +/- 1.7) mb.| File | Dimensione | Formato | |
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