First measurement of the total proton-proton cross-section at the LHC energy of √s = 7 TeV

G. Antchev, P. Aspell, I. Atanassov, V. Avati, J. Baechler, V. Berardi, M. Berretti, E. Bossini, M. Bozzo, P. Brogi, E. Brücken, A. Buzzo, F. S. Cafagna, M. Calicchio, M. G. Catanesi, C. Covault, T. Csörgó, M. Deile, K. Eggert, V. EreminR. Ferretti, F. Ferro, A. Fiergolski, F. Garcia, S. Giani, V. Greco, L. Grzanka, J. Heino, T. Hilden, M. R. Intonti, J. Kašpar, J. Kopal, V. Kundrát, K. Kurvinen, S. Lami, G. Latino, R. Lauhakangas, T. Leszko, E. Lippmaa, M. Lokajíček, M. Lo Vetere, F. Lucas Rodríguez, M. MacRí, L. Magaletti, A. Mercadante, S. Minutoli, F. Nemes, H. Niewiadomski, E. Oliveri, F. Oljemark, R. Orava, M. Oriunno, K. Österberg, P. Palazzi, J. Procházka, M. Quinto, E. Radermacher, E. Radicioni, F. Ravotti, E. Robutti, L. Ropelewski, G. Ruggiero, H. Saarikko, G. Sanguinetti, A. Santroni, A. Scribano, W. Snoeys, J. Sziklai, C. Taylor, N. Turini, V. Vacek, M. Vitek, J. Welti, J. Whitmore

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Abstract

TOTEMhas measured the differential cross-section for elastic proton-proton scattering at the LHC energy of √s = 7TeV analysing data from a short run with dedicated large-β* optics. A single exponential fit with a slope B = (20.1±0.2stat ±0.3syst)GeV-2 describes the range of the four-momentum transfer squared |t| from 0.02 to 0.33 GeV2. After the extrapolation to |t| = 0, a total elastic scattering cross-section of (24.8 ± 0.2stat ± 1.2 syst)mb was obtained. Applying the optical theorem and using the luminosity measurement from CMS, a total proton-proton cross-section of (98.3 ± 0.2stat ± 2.8syst)mb was deduced which is in good agreement with the expectation from the overall fit of previously measured data over a large range of center-of-mass energies. From the total and elastic pp cross-section measurements, an inelastic pp cross-section of (73.5 ± 0.6stat +1.8-1.3syst)mb was inferred.

Original languageEnglish
Article number21002
JournalEPL
Volume96
Issue number2
DOIs
Publication statusPublished - 2011

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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    Antchev, G., Aspell, P., Atanassov, I., Avati, V., Baechler, J., Berardi, V., Berretti, M., Bossini, E., Bozzo, M., Brogi, P., Brücken, E., Buzzo, A., Cafagna, F. S., Calicchio, M., Catanesi, M. G., Covault, C., Csörgó, T., Deile, M., Eggert, K., ... Whitmore, J. (2011). First measurement of the total proton-proton cross-section at the LHC energy of √s = 7 TeV. EPL, 96(2), [21002]. https://doi.org/10.1209/0295-5075/96/21002