The TOTEM experiment has made a precise measurement of the elastic proton proton differential cross-section at the centre-of-mass energy root s = 8 TeV based on a high-statistics data sample obtained with the beta* = 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 < vertical bar t vertical bar < 0.2 GeV2 with a significance greater than 7 sigma. 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.

Antchev, G., Aspell, P., Atanassov, I., Avati, V., Baechler, J., Berardi, V., et al. (2015). Evidence for non-exponential elastic proton-proton differential cross-section at low |t| and √s=8 TeV by TOTEM. NUCLEAR PHYSICS. B, 899, 527-546 [10.1016/j.nuclphysb.2015.08.010].

Evidence for non-exponential elastic proton-proton differential cross-section at low |t| and √s=8 TeV by TOTEM

BERRETTI, MIRKO;BOSSINI, EDOARDO;BOTTIGLI, UBALDO;LOSURDO, LILIANA;OLIVERI, ERALDO;SCRIBANO, ANGELO;TURINI, NICOLA;
2015-01-01

Abstract

The TOTEM experiment has made a precise measurement of the elastic proton proton differential cross-section at the centre-of-mass energy root s = 8 TeV based on a high-statistics data sample obtained with the beta* = 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 < vertical bar t vertical bar < 0.2 GeV2 with a significance greater than 7 sigma. 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.
Antchev, G., Aspell, P., Atanassov, I., Avati, V., Baechler, J., Berardi, V., et al. (2015). Evidence for non-exponential elastic proton-proton differential cross-section at low |t| and √s=8 TeV by TOTEM. NUCLEAR PHYSICS. B, 899, 527-546 [10.1016/j.nuclphysb.2015.08.010].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11365/982089