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Summary of the Spin Physics session

Summary of the Spin Physics session. -- experimental part --. Delia Hasch. (spin) structure of the nucleon. “ You think you understand something? Now add spin…” -- R. Jaffe. K. Krysztof A. Korzenev L. De Nardo K. Griffion P. Cole K. Slifer. @6GeV. polarised structure functions: g 1.

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Summary of the Spin Physics session

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  1. Summary of theSpin Physics session -- experimental part -- Delia Hasch

  2. (spin) structure of the nucleon “You think you understand something? Now add spin…”-- R. Jaffe K. Krysztof A. Korzenev L. De Nardo K. Griffion P. Cole K. Slifer @6GeV

  3. polarised structure functions: g1 [L. De Nardo] proton, deuteron neutron

  4. (theory) (exp) (evol) • = 0.330 ± 0.011 ± 0.025 ± 0.028 a0=DS MS MS a0= DS = 0.35 ± 0.03(stat) ± 0.05(sys+evol) polarised structure functions: g1 [L. De Nardo K. Krysztof] @Q2=5GeV2 @Q2=3GeV2 Q2>1GeV2

  5. helicity distributions [A. Korzenev] valence quark distributions: Duv+Ddv from semi-inclusive difference asymmetry: first SIDIS result from COMPASS!

  6. study of high x • prove of duality • determination of HT … spin structure EG1/4/12 @CLAS [K. Griffion, K. Slifer] • GDH SR • resonance region Q2 (GeV2) 0Q2

  7. (spin) structure of the nucleon P. Liebing S. Koblitz K. Okada R. Fatemi F. Simon J. Lajoie

  8. AAC GRSV BB LSS gluon polarisation from scaling violation:

  9. gluon polarisation [P. Liebing, S. Koblitz] “direct” measurements: • golden channel: charm production • hadron production at high PT Photon-Gluon Fusion(PGF)

  10. gluon polarisation “direct” measurements: polarised pp @RHIC :

  11.  ALL for p+ , p- , J/Y gluon polarisation [K. Okada, R. Fatemi, F. Simon] “direct” measurements: polarised pp @RHIC : 2005 data

  12. upgrade programme gluon polarisation [K. Okada, R. Fatemi, F. Simon, J. Lajoie] “direct” measurements: polarised pp @RHIC FUTURE:  2006: 7.5 pb-1 @60% polarisation projections  Di-jets: directly xg

  13. (spin) structure of the nucleon transversity&friends • R. Seidl • M. Diefenthaler • A. Bressan • U. D’Alesio • O. Eyser • S. Heppelmann • J. Lee • J. Balitsky • C. Schill • Kotzinian

  14. e+ e- first glimpse of transversity global fit of data from BELLE(FF ), HERMES and COMPASS(DFxFF ) Collins fragmentation function AUT sin(f+fs)

  15. first glimpse of transversity global fit of data from BELLE(FF ), HERMES and COMPASS(DFxFF ) [U. D’Alesio] Collins fragmentation function

  16. new data: first glimpse of transversity global fit of data from BELLE(FF ), HERMES and COMPASS(DFxFF ) [U. D’Alesio] [R. Seidl, M. Diefenthaler, A. Bressan] 29 fb-1 547 fb-1 full data set with transv. target: p+/-/0 ,K+/- p+/- ,K+/-

  17. transversity [M. Diefenthaler, A. Bressan] p+ full data set p+/- p- K+/-

  18. Sivers [M. Diefenthaler, A. Bressan] • implies non-zero Lq p+/- K+/-

  19. left right transversity&friends @RHIC [J. Lee, O. Eyser, S. Heppelmann, J. Balewski] • K+/- ,p,p-bar p0 2006: P~60%

  20. left right • jet back-to-back correlations  Sivers • two hadron correlation  transversity • … transversity&friends @RHIC [J. Lee, O. Eyser, S. Heppelmann, J. Balewski] • K+/- ,p,p-bar p0 2006: P~60%

  21. (spin) structure of the nucleon H. Guler A. Rostomyan A. Mussgiller E. Voutier J. Pierce HallA, CLAS

  22. Q2 t ( H + E) x dx =Jq = 1/2 DS+ Lz 10-30%(DIS) hunting for Lq  hard exclusive processes: Generalised Parton Distributions Q2>>, t<<

  23. e+/- p→ e+/- p g (MX<1.7 GeV) (in HERMES acceptance) Regge, D-term Regge, no D-term fac., D-term fac., no D-term DVCSbeam charge asymmetry [A. Mussgiller] [PRD75(2007)] 1998 e- data set 10 pb-1  20xmore e- statistics on tape from 2005/06

  24. HallA hunting for Lq GPD: E observables: AUT r0  DVCS DVCS cross section on neutron

  25. DVCS HallA xB=0.36, Q2=1.91 GeV2 hunting for Lq GPD: E [A. Rostomyan, A. Mussgiller, E. Voutier] AUT t (GeV2) x Q2 (GeV2) x

  26. hunting for Lq [A. Mussgiller, E. Voutier] model dependent constraint of Ju vs Jd

  27. much more polarisation observables [Y. Naryshkin, P. Cole, J. Pierce] • transverse L polarisation • determining the spin structure of resonances • transverse spin of the pion • hydrogen hyperfine splitting • …

  28. spin physics is a very active field thanks to all the participants of the Spin Session for this fruitful meeting Daniel, Gerhard & Delia [apologises to all speakers not covered in this summary]

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