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The goal of the "GPDs @ COMPASS" workshop at CERN on 4 March 2010

The goal of the "GPDs @ COMPASS" workshop at CERN on 4 March 2010 i s to better define the key measurements and their outcomes with together theoreticians and experimentalists. SPS proton beam : 2.6 10 13 / spill of 9.6 s , 400 GeV /c

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The goal of the "GPDs @ COMPASS" workshop at CERN on 4 March 2010

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  1. The goal of the "GPDs @ COMPASS" workshop at CERNon 4 March 2010 is to better define the key measurements and their outcomes • with together theoreticians and experimentalists

  2. SPS proton beam: 2.61013/spill of 9.6s, 400 GeV/c • Secondary hadron beams (, K, …): 4.108/spill, 150-270 GeV/c • Tertiary muon beam (80% pol): 4.6108/spill, 100-200 GeV/c • -> Luminosity ~ 1032cm-2 s-1witha 2.5m long LH target 60m 60m COMPASS LHC CNGS Gran Sasso 732 kms SPS high energy beam(s), broad kinematic range, large angular acceptance

  3. COMPASS: a Facility to study QCD A Collaboration of 240 Physicists of 12 countries COMMON MUONand PROTON APPARATUSfor STRUCTUREand SPECTROSCOPY • StudiesuntilNow: • Nucleon Spin withhighenergypolarized beams: - The gluon contribution to the Nucleonspin - The polarizedvalence quark contr. - The light quark seapolarization - The transverse spin effects ----> How large are the orbital angularmom. contributions? ½= ½ΔΣ+ ΔG+Lq+Lg quark gluon orbital momentum • Spectroscopywith hadron beams: • Searchof hybrids and glueballs to betterunderstand • quark and gluon confinement

  4. COMPASS: a Facility to study QCD A Collaboration of 240 Physicists of 12 countries COMMON MUONand PROTON APPARATUSfor STRUCTUREand SPECTROSCOPY Long TermPlans 2012: LoIsubmitted to CERN/SPSC in January2009 Proposalin preparation • Transv. Spatial Distrib. GPDswith DVCS and DVMP withμbeams • StrangePDF and Transv. Mom. Distrib. with SIDIS • simultaneouslywith the GPD program • Transv. Mom. Distrib. withDrell-Yan withπ and in far future p, K • Test of Chiral Perturb. theorythroughPrimakoffexp. withπ, K beam

  5. *  Q² Q²xBj x+ x- x p GPDs p t From Inclusive and Semi-Inclusive exp. to Exclusive experiments Hard Exclusive Scattering Deeply Virtual Compton Scattering Deep Inelastic Scattering ep eX ep ep γ* p z z x P x P b y y x boost x boost Generalized Parton Distribution H(x,,t ) Parton Density q ( x ) • ( Px, b) Px

  6.   Generalised Parton Distribution functions (H,H,E,E): • Allow for a unified description of formfactorsand parton distributions • Allow for transverse imaging (nucleontomography) and giveaccess to the quark angularmomentum(through E)  Impact parameterb Longitudinal momentum fraction x Tomographicparton images of the nucleon

  7.   Generalised Parton Distribution functions (H,H,E,E): • Allow for a unified description of formfactorsand parton distributions • Allow for transverse imaging (nucleontomography) and giveaccess to the quark angularmomentum(through E) Tomographicparton images of the nucleon  G P S

  8.   Generalised Parton Distribution functions (H,H,E,E): • Allow for a unified description of formfactorsand parton distributions • Allow for transverse imaging (nucleontomography) and giveaccess to the quark angularmomentum(through E) • Matthias Burkardt: GPDs as a tool to StudyNucleon Structure • Christian Weiss: Transverse Size and Partonic Structure atIntermediate x • Philipp Haegler:LatticeCalculations • Dieter Mueller: Global GPD fits • Peter Kroll:PhenomenologicalExperience

  9. Kinematicdomains for the world GPD experiments • H1/ZEUS: Laurent Schoeffel • transv size of nucleonthrough • manyresults on DVMP and DVCS • HERMES/Jlab: Delia Hasch • review of DVCS experiments • COMPASS: Etienne Burtin • highenergypolarized+ and - • relative yield of DVCS and BH • projections and tests for DVCS

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