4.3 Article

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

Journal

NUCLEAR PHYSICS B
Volume 899, Issue -, Pages 527-546

Publisher

ELSEVIER SCIENCE BV
DOI: 10.1016/j.nuclphysb.2015.08.010

Keywords

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Funding

  1. Magnus Ehrnrooth foundation (Finland)
  2. Waldemar von Frenckell foundation (Finland)
  3. Academy of Finland
  4. Finnish Academy of Science and Letters
  5. OTKA (Hungary) [NK 101438]
  6. Nylands nation vid Helsingfors universitet (Finland)
  7. MSMT CR (Czech Republic)

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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. (C) 2015 The Authors. Published by Elsevier B.V.

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