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, V., 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., et al.. - 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
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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