The European Physical Journal Special Topics

, Volume 162, Issue 1, pp 19–24 | Cite as

Recent results on polarized PDFs and higher twist

Article
  • 35 Downloads

Abstract

The impact of the recent very precise CLAS and COMPASS g 1/F 1 data on polarized parton densities and higher twist effects is discussed. It is demonstrated that the low Q 2 CLAS data improve essentially our knowledge of higher twist corrections to the spin structure function g 1, while the large Q 2 COMPASS data influence mainly the strange quark and gluon polarizations. It is also shown that the uncertainties in the determination of the polarized parton densities are significantly reduced. We find also that the present inclusive DIS data cannot rule out a negative polarized and changing in sign gluon densities. The present status of the proton spin sum rule is discussed.

Keywords

European Physical Journal Special Topic Strange Quark Gluon Density High Twist Gluon Polarization 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. 1.
    E. Leader, A.V. Sidorov, D.B. Stamenov, Phys. Rev. D 67, 074017 (2003)Google Scholar
  2. 2.
    K.V. Dharmwardane, et al. [CLAS Collaboration], Phys. Lett. B 641, 11 (2006)CrossRefADSGoogle Scholar
  3. 3.
    V.Yu. Alexakhin, et al. [COMPASS Collaboration], Phys. Lett. B 647, 8 (2007)CrossRefADSGoogle Scholar
  4. 4.
    M. Arneodo, et al. [NMC Collaboration], Phys. Lett. B 364, 107 (1995)CrossRefADSGoogle Scholar
  5. 5.
    K. Abe, et al. [SLAC E143 Collaboration], Phys. Lett. B 452, 194 (1999)CrossRefADSGoogle Scholar
  6. 6.
    A. Piccione, G. Ridolfi, Nucl. Phys. B 513, 301 (1998); J. Blumlein, A. Tkabladze, Nucl. Phys. B 553, 427 (1999)CrossRefADSGoogle Scholar
  7. 7.
    E. Leader, A.V. Sidorov, D.B. Stamenov, Phys. Rev. D 73, 034023 (2006)Google Scholar
  8. 8.
    J. Ashman, et al. [EMC Collaboration], Phys. Lett. B 206, 364 (1988); Nucl. Phys. B 328, 1 (1989); P.L. Anthony, et al. [SLAC E142 Collaboration], Phys. Rev. D 54, 6620 (1996); K. Abe, et al. [SLAC/E154 Collaboration], Phys. Rev. Lett. 79, 26 (1997); B. Adeva, et al. [SMC Collaboration], Phys. Rev. D 58, 112001 (1998); K. Abe, et al. [SLAC E143 Collaboration], Phys. Rev. D 58, 112003 (1998); P.L. Anthony, et al. [SLAC E155 Collaboration], Phys. Lett. B 463, 339 (1999); B 493, 19 (2000); X. Zheng, et al. [JLab/Hall A Collaboration], Phys. Rev. Lett. 92, 012004 (2004); A. Airapetian, et al. [HERMES Collaboration], Phys. Rev. D 71, 012003 (2005); E.S. Ageev, et al. [COMPASS Collaboration], Phys. Lett. B 612, 154 (2005)CrossRefADSGoogle Scholar
  9. 9.
    E. Leader, A.V. Sidorov, D.B. Stamenov, Phys. Rev. D 75, 074027 (2007)Google Scholar
  10. 10.
    R.D. Carlitz, J.C. Collins, A.H. Mueller, Phys. Lett. B 214, 229 (1988); M. Anselmino, A.V. Efremov, E. Leader, Phys. Rep. 261, 1 (1995); H.-Y. Cheng, Int. J. Mod. Phys. A 11, 5109 (1996); D. Müller, O.V. Teryaev, Phys. Rev. D 56, 2607 (1997)CrossRefADSGoogle Scholar
  11. 11.
    A.W. Shreiber, A.W. Thomas, Phys. Lett. B 215, 141 (1988); R.D. Jaffe, A. Manohar, Nucl. Phys. B 337, 509 (1990)CrossRefADSGoogle Scholar
  12. 12.
    S.N. Shore, G. Veneziano, Phys. Lett. B 244, 75 (1990); S. Forte, E.V. Shuryak, Nucl. Phys. B 357, 153 (1991)CrossRefADSGoogle Scholar
  13. 13.
    A.E. Dorokhov, Czech. J. Phys. 52, C79 (2002); A.E. Dorokhov, N.I. Kochelev, Yu.A. Zubov, Int. J. Mod. Phys. A 8, 603 (1993); A.E. Dorokhov, N.I. Kochelev, Phys. Lett. B 304, 167 (1993)CrossRefGoogle Scholar
  14. 14.
    S. Pate, AIP Conf. Proc. 915, 391 (2007) [arXiv:hep-ex/0611053]CrossRefADSGoogle Scholar

Copyright information

© EDP Sciences and Springer 2008

Authors and Affiliations

  1. 1.Imperial College LondonLondonUK
  2. 2.Bogoliubov Laboratory of Theoretical PhysicsJINRDubnaRussia
  3. 3.Institute for Nuclear Research and Nuclear EnergyBulgarian Academy of SciencesSofiaBulgaria

Personalised recommendations