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

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          Abstract

          The TOTEM experiment has made a precise measurement of the elastic proton-proton differential cross-section at the centre-of-mass energy sqrt(s) = 8 TeV based on a high-statistics data sample obtained with the beta* = 90 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 < |t| < 0.2 GeV^2 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.

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          Author and article information

          Journal
          2015-03-27
          2015-09-12
          Article
          10.1016/j.nuclphysb.2015.08.010
          1503.08111
          04cb1a72-988d-4e79-b38b-1c6d6ce8e50a

          http://arxiv.org/licenses/nonexclusive-distrib/1.0/

          History
          Custom metadata
          CERN-PH-EP-2015-083
          Nuclear Physics B 899 (2015) 527-546
          Final version published in Nuclear Physics B
          hep-ex

          High energy & Particle physics
          High energy & Particle physics

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