A high-statistics measurement of transverse spin effects in dihadron production from muon-proton semi-inclusive deep-inelastic scattering

Article, Preprint English OPEN
Adolph, C. ; Akhunzyanov, R. ; Alekseev, M. G. ; Alexandrov, Yu. ; Alexeev, G. D. ; Amoroso, A. ; Andrieux, V. ; Anosov, V. ; Austregesilo, A. ; Badelek, B. ; Balestra, F. ; Barth, J. ; Baum, G. ; Beck, R. ; Bedfer, Y. ; Berlin, A. ; Bernhard, J. ; Bertini, R. ; Bicker, K. ; Bieling, J. ; Birsa, R. ; Bisplinghoff, J. ; Bodlak, M. ; Boer, M. ; Bordalo, P. ; Bradamante, F. ; Braun, C. ; Bravar, A. ; Bressan, A. ; Buechele, M. ... view all 221 authors (2014)
  • Publisher: Ludwig-Maximilians-Universität München
  • Journal: volume 736, issue 0370-2693, pages 124-131 (issn: 0370-2693, eissn: 1873-2445)
  • Related identifiers: doi: 10.1016/j.physletb.2014.06.080
  • Subject: Physik | Particle Physics - Experiment | High Energy Physics - Phenomenology | info:eu-repo/classification/ddc/ddc:530 | info:eu-repo/classification/arxiv/Nuclear Experiment | Physics | High Energy Physics - Experiment | info:eu-repo/classification/arxiv/High Energy Physics::Experiment | QC1-999 | Nuclear and High Energy Physics
    • ddc: ddc:530
    arxiv: Nuclear Experiment | High Energy Physics::Experiment

A measurement of the azimuthal asymmetry in dihadron production in deep-inelastic scattering of muons on transversely polarised proton (NH3) targets is presented. They provide independent access to the transversity distribution functions through the measurement of the Collins asymmetry in single hadron production. The data were taken in the year 2010 with the COMPASS spectrometer using a 160 GeV/c muon beam of the CERN SPS, increasing by a factor of about four the overall statistics with respect to the previously published data taken in the year 2007. The measured sizeable asymmetry is in good agreement with the published data. An approximate equality of the Collins asymmetry and the dihadron asymmetry is observed, suggesting a common physical mechanism in the underlying fragmentation. (C) 2014 The Authors. Published by Elsevier B.V.
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