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

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Presentation transcript:

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

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

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

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

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

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

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

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

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

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

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

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

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

x azimuthal asymmetries - cos  z Structure of Nucleons and Nuclei, June 14, 2013 Franco Bradamante

azimuthal asymmetries - cos 2  z x Structure of Nucleons and Nuclei, June 14, 2013 Franco Bradamante

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

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

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

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

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

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

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

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

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

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

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

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

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