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Structure of Nucleons and Nuclei Como June 14, 2013 CONCLUDING REMARKS F. Bradamante University of Trieste, Italy.

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Presentation on theme: "Structure of Nucleons and Nuclei Como June 14, 2013 CONCLUDING REMARKS F. Bradamante University of Trieste, Italy."— Presentation transcript:

1 Structure of Nucleons and Nuclei Como June 14, 2013 CONCLUDING REMARKS F. Bradamante University of Trieste, Italy

2 EMC1988 The Quark Contribution to the Nucleon Spin  1 p = 0.123  0.013  0.019  = 0.12  0.17  SPIN CRISIS Structure of Nucleons and Nuclei, June 14, 2013 Franco Bradamante

3 25 years ! Structure of Nucleons and Nuclei, June 14, 2013 Franco Bradamante

4 19701980199020002010 SLAC CERN DESY JLab RHIC A worldwide effort since decades Experiments E80 EMCSMCCOMPASS E130E142/3 E154/5 HERMES CLAS/HALL-A, B Phenix/Star SPIN CRISIS and Theory Structure of Nucleons and Nuclei, June 14, 2013 Franco Bradamante

5 many unresolved puzzles even before transverse spin effects: Hyperon polarization E704 Krisch effect spin sum-rule Spin Physics push in US for a polarized proton collider but undoubtedly the EMC result caused a phase transition record number of citations sum rules !!! QCD !!! Structure of Nucleons and Nuclei, June 14, 2013 Franco Bradamante

6 HERMES and COMPASS gave their contribution the ball is on the RHIC side measurements of Gluon Helicity Structure of Nucleons and Nuclei, June 14, 2013 Franco Bradamante

7 measurements of Gluon Helicity Structure of Nucleons and Nuclei, June 14, 2013 Franco Bradamante

8 Structure of Nucleons and Nuclei, June 14, 2013 Franco Bradamante spin sum-rule Δ s = 0.08 incompatible with SIDIS measurement ΔΣ ΔΣ OK but measurements of ΔΣ

9 priority issue: multiplicities strange helicity puzzle Structure of Nucleons and Nuclei, June 14, 2013 Franco Bradamante

10 Structure of Nucleons and Nuclei, June 14, 2013 Franco Bradamante TRANSVERSE SPIN !

11 Since many years intriguing evidence of large transverse spin effects at high energy hyperon polarization high p t effects in hadronic interactions asymmetries in hadron production Transverse Spin Bonn, 15 December 2011 Structure of Nucleons and Nuclei, June 14, 2013 Franco Bradamante US: pp collider Europe: HELP at LEP HERMESCOMPASS

12 Collins asymmetry Sivers asymmetry Sivers asymmetry and,shortly after : Structure of Nucleons and Nuclei, June 14, 2013 Franco Bradamante

13 unpolarised SIDIS cross-section huge ammount of data from HERMES and COMPASS Structure of Nucleons and Nuclei, June 14, 2013 Franco Bradamante

14 x 0.003 0.038 0.020 0.012 0.130 azimuthal asymmetries - cos  0.200.25 0.40 0.320.550.700.85 z Structure of Nucleons and Nuclei, June 14, 2013 Franco Bradamante

15 azimuthal asymmetries - cos 2  0.200.25 0.40 0.320.550.700.85 z x 0.003 0.038 0.020 0.012 0.130 Structure of Nucleons and Nuclei, June 14, 2013 Franco Bradamante

16 (transverse) spin dependent asymmetries Sivers asymmetry studies of Q 2 evolution Structure of Nucleons and Nuclei, June 14, 2013 Franco Bradamante

17 (transverse) spin dependent asymmetries Transversity Structure of Nucleons and Nuclei, June 14, 2013 Franco Bradamante

18 (transverse) spin dependent asymmetries Transversity M. Radici Structure of Nucleons and Nuclei, June 14, 2013 Franco Bradamante

19 INTERPLAY BETWEEN COLLINS ASYMMETRY AND TWO-HADRON ASYMMETRY X. Artru Structure of Nucleons and Nuclei, June 14, 2013 Franco Bradamante and HERMES (L. Pappalardo)

20 test of pseudo-universality of T-odd TMD PDFs measurement of polarised Drell-Yan COMING SOON ! Structure of Nucleons and Nuclei, June 14, 2013 Franco Bradamante

21 more on theory … Structure of Nucleons and Nuclei, June 14, 2013 Franco Bradamante

22 Structure of Nucleons and Nuclei, June 14, 2013 Franco Bradamante

23 GPDs and hard work ! Structure of Nucleons and Nuclei, June 14, 2013 Franco Bradamante

24 OAM A. Bacchetta Structure of Nucleons and Nuclei, June 14, 2013 Franco Bradamante

25 FUTURE Structure of Nucleons and Nuclei, June 14, 2013 Franco Bradamante

26 message to the community today: a lot of results / data from still time to extract valuable physics from existing data but hurry up, don’t wait too long! make specific suggestions HERMES COMPASS JLab6 to-morrow: COMPASS-II JLab12 Structure of Nucleons and Nuclei, June 14, 2013 Franco Bradamante

27 second message to the community from to … Structure of Nucleons and Nuclei, June 14, 2013 Franco Bradamante

28 … Transversity 2014 ! Structure of Nucleons and Nuclei, June 14, 2013 Franco Bradamante

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