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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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arxiv 1503.08111 v4 pith:YN2EWOSY submitted 2015-03-27 hep-ex

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

TOTEM Collaboration: G. Antchev , P. Aspell , I. Atanassov , V. Avati , J. Baechler , V. Berardi , M. Berretti , E. Bossini
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U. Bottigli M. Bozzo A. Buzzo F. S. Cafagna C. E. Campanella M. G. Catanesi M. Csan\'ad T. Cs\"org\H{o} M. Deile F. De Leonardis A. D'Orazio M. Doubek K. Eggert V. Eremin F. Ferro A. Fiergolski F. Garcia V. Georgiev S. Giani L. Grzanka C. Guaragnella J. Hammerbauer J. Heino A. Karev J. Ka\v{s}par J. Kopal V. Kundr\'at S. Lami G. Latino R. Lauhakangas E. Lippmaa J. Lippmaa M. V. Lokaj\'i\v{c}ek L. Losurdo M. Lo Vetere F. Lucas Rodr\'iguez M. Macr\'i A. Mercadante N. Minafra S. Minutoli T. Naaranoja F. Nemes H. Niewiadomski E. Oliveri F. Oljemark R. Orava M. Oriunno K. \"Osterberg P. Palazzi V. Passaro Z. Peroutka V. Petruzzelli T. Politi J. Proch\'azka F. Prudenzano M. Quinto E. Radermacher E. Radicioni F. Ravotti E. Robutti L. Ropelewski G. Ruggiero H. Saarikko A. Scribano J. Smajek W. Snoeys T. Sodzawiczny J. Sziklai C. Taylor N. Turini V. Vacek J. Welti P. Wyszkowski K. Zielinski
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classification hep-ex
keywords cross-sectiondifferentialtotemdataelasticproton-protonsqrtagreement
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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 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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