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

Antchev, G. and Aspell, P. and Atanassov, I. and Avati, V. and Baechler, J. and Berardi, V. and Berretti, M. and Bossini, E. and Bottigli, U. and Bozzo, M. and Broulim, P. and Buzzo, A. and Cafagna, F. S. and Campanella, C. E. and Catanesi, M. G. and Csanád, Máté and Csörgő, Tamás and Deile, M. and De Leonardis, F. and D'Orazio, A. and Doubek, M. and Eggert, K. and Eremin, V. and Ferro, F. and Fiergolski, A. and Garcia, F. and Georgiev, V. and Giani, S. and Grzanka, L. and Guaragnella, C. and Nemes, Frigyes and Sziklai, János István (2015) Evidence for non-exponential elastic proton-proton differential cross-section at low |t| and √s=8 TeV by TOTEM. NUCLEAR PHYSICS B, 899. pp. 527-546. ISSN 0550-3213

Preview

Text 1503.08111.pdf Available under License Creative Commons Attribution. Download (938kB) | Preview

Abstract

The TOTEM experiment has made a precise measurement of the elastic proton-proton differential cross-section at the centre-of-mass energy √ s = 8 TeV based on a high-statistics data sample obtained with the β ∗ = 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 fourmomentum transfer squared 0.027 < |t| < 0.2 GeV2 with a significance greater than 7σ. 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.

Actions (login required)

Edit Item