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Physics Topics

Physics Topics. inclusive physics unpolarised structure funcions polarised struture functions electroweak physics tests of standard model electroweak structur functions semi-inclusive physics current quark fragmentation and flavour separation

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Physics Topics

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  1. Physics Topics • inclusive physics • unpolarised structure funcions • polarised struture functions • electroweak physics • tests of standard model • electroweak structur functions • semi-inclusive physics • current quark fragmentation and flavour separation • target fragmentation and correlation between current and target fragmentation • polarised gluon distribution G • charm production • jets

  2. Physics Topics • azimuthal asymmetries • Transverse Momentum Dependent Parton Distributions • Sivers and Collins functions • Orbital momentum ? • exclusive processes and diffraction • DVCS • Meson production • 3 dimensional image of the proton • orbital momentum ? • Photoproduction

  3. The Gluon Contribution to the Nucleon Spin Antje Bruell, Jlab EIC meeting, MIT, April 7 2007 • Introduction • G from scaling violations of g1(x,Q2) • The Bjorken Sum Rule • G from charm production

  4. The Gluon Contribution to the Nucleon Spin Antje Bruell, Jlab EIC meeting, MIT, April 7 2007 • Introduction • G from scaling violations of g1(x,Q2) • The Bjorken Sum Rule • G from charm production

  5. The Gluon Contribution to the Nucleon Spin Antje Bruell, Jlab EIC meeting, MIT, April 7 2007 • Introduction • G from scaling violations of g1(x,Q2) • The Bjorken Sum Rule • G from charm production

  6. World Data on g1p EIC Data on g1p < 2 orders of magnitude, precision !!! Sufficient coverage in x and Q2 to detrmine D G

  7. G from scaling violations of g1

  8. g1 and the Bjorken Sum Rule

  9. Bjorken Sum Rule Needs: O(1%) Ion Polarimetry!!! excellent determination of as(Q2) • Sub-1% statistical precision at ELIC • (averaged over all Q2) • 3-4% precision at various values of Q2

  10. Precisely image the sea quarks Spin-Flavor Decomposition of the Light Quark Sea u u u > u d Many models predict Du > 0, Dd < 0 | p = + + + … u u u u d d d d RHIC-Spin region

  11. c D mesons c D mesons Polarized gluon distribution via charm production very clean process ! LO QCD: asymmetry in D production directly proportional to G/G

  12. Polarized gluon distribution via charm production Precise determination of  G/G for 0.003 < xg < 0.4 at common Q2 of 10 GeV2 however RHIC SPIN

  13. Precise determination of  G/G for 0.003 < xg < 0.4 at common Q2 of 10 GeV2 Polarized gluon distribution via charm production • If: • We can measure the scattered electron even at angles close to 00 (determination of photon kinematics) • We can separate the primary and secondary vertex down to about 100 m • We understand the fragmentation of charm quarks () • We can control the contributions of resolved photons • We can calculate higher order QCD corrections ()

  14. charm production: detector consequences • Need to measure the scattered electron at angles close to 00 how ? • Need to separate the primary and secondary vertex down to about 100 m  how to determine the primary vertex ? • For charm decay products need to instrument only  15-200 around proton direction • Simple set of silicon disks might be sufficient for vertex detection • Momenta of decay products between 1.5 and 10(15) GeV

  15. Correlation between Transverse Spin and Momentum of Quarks in Unpolarized Target All Projected Data Perturbatively Calculable at Large pT Vanish like 1/pT (Yuan) ELIC

  16. The Gluon Contribution to the Nucleon Spin Antje Bruell, Jlab EIC meeting, MIT, April 7 2007 • Introduction • G from scaling violations of g1(x,Q2) • The Bjorken Sum Rule • G from charm production

  17. The Gluon Contribution to the Nucleon Spin Antje Bruell, Jlab EIC meeting, MIT, April 7 2007 • Introduction • G from scaling violations of g1(x,Q2) • The Bjorken Sum Rule • G from charm production

  18. The Gluon Contribution to the Nucleon Spin Antje Bruell, Jlab EIC meeting, MIT, April 7 2007 • Introduction • G from scaling violations of g1(x,Q2) • The Bjorken Sum Rule • G from charm production

  19. Summary and Next Steps • goals: • realistic estimates for key processes • consequencs for detector design for all key processes • status: • realistic estimates for very few processes • hardly any idea about detector constrains • simulation of some more processes just started • several interested people identified • next steps: • continue in identification of people interested/capable to do some real work • start working group meetings (around collaboration meetings)

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