Advertisement

The European Physical Journal Special Topics

, Volume 162, Issue 1, pp 89–96 | Cite as

New target transverse spin dependent azimuthal asymmetries from COMPASS experiment

Article

Abstract

In general, eight target transverse spin-dependent azimuthal modulations are allowed in semi inclusive deep inelastic scattering of polarized leptons on a transversely polarized target. In the QCD parton model four of these asymmetries can be interpreted within the leading order approach. Two of them, namely Collins and Sivers effects were already measured by HERMES and COMPASS experiments. Other two leading twist and remaining four azimuthal asymmetries which can be interpreted as twist-three contributions have been measured for the first time in COMPASS using a 160 GeV/c longitudinally polarized (P l }~ −0.8) muon beam and a transversely polarized 6LiD target. We present here the preliminary results from the 2002–2004 data.

Keywords

European Physical Journal Special Topic Transverse Spin Blue Triangle Azimuthal Asymmetry Muon Beam 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. 1.
    A. Kotzinian, Nucl. Phys. B 441, 234 (1995) [arXiv:hep-ph/9412283]CrossRefADSGoogle Scholar
  2. 2.
    A. Airapetian, et al. [HERMES Collaboration], Phys. Rev. Lett. 94, 012002 (2005) [arXiv:hep-ex/0408013]Google Scholar
  3. 3.
    V.Y. Alexakhin, et al. [COMPASS Collaboration], Phys. Rev. Lett. 94, 202002 (2005) [arXiv:hep-ex/0503002]Google Scholar
  4. 4.
    E.S. Ageev, et al. [COMPASS Collaboration], Nucl. Phys. B 765, 31 (2007) [arXiv:hep-ex/0610068]CrossRefADSGoogle Scholar
  5. 5.
    R. Seidl, et al. [Belle Collaboration], Phys. Rev. Lett. 96, 232002 (2006) [arXiv:hep-ex/0507063]Google Scholar
  6. 6.
    M. Anselmino, M. Boglione, U. D’Alesio, A. Kotzinian, F. Murgia, A. Prokudin, Phys. Rev. D 72, 094007 (2005); Erratum: Phys. Rev. D 72, 099903 (2005) [arXiv:hep-ph/0507181]Google Scholar
  7. 7.
    M. Anselmino, M. Boglione, U. D’Alesio, A. Kotzinian, F. Murgia, A. Prokudin, C. Turk, Phys. Rev. D 75, 054032 (2007) [arXiv:hep-ph/0701006]Google Scholar
  8. 8.
    A. Bacchetta, M. Diehl, K. Goeke, A. Metz, P. Mulders, M. Schlegel, JHEP 0702, 093 (2007) [arXiv:hep-ph/0611265]Google Scholar
  9. 9.
    A. Kotzinian, B. Parsamyan, A. Prokudin, Phys. Rev. D 73, 114017 (2006) [arXiv:hep-ph/0603194]Google Scholar

Copyright information

© EDP Sciences and Springer 2008

Authors and Affiliations

  1. 1.Dipartimento di Fisica GeneraleUniversità di TorinoTorinoItaly
  2. 2.Sezione di TorinoINFNTorinoItaly

Personalised recommendations