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Working Group on e-p Physics A. Bruell, E. Sichtermann, W. Vogelsang, C. Weiss Antje Bruell, JLab EIC meeting, Stony Brook, Dec 8 2007 Physics Topics Working Group Organisation Status of Simulations Plans for the Future

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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

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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

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The Gluon Contribution to the Nucleon Spin Antje Bruell, Jlab EIC meeting, MIT, April 7 2007 Introduction G from scaling violations of g 1 (x,Q 2 ) The Bjorken Sum Rule G from charm production

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The Gluon Contribution to the Nucleon Spin Antje Bruell, Jlab EIC meeting, MIT, April 7 2007 Introduction G from scaling violations of g 1 (x,Q 2 ) The Bjorken Sum Rule G from charm production

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The Gluon Contribution to the Nucleon Spin Antje Bruell, Jlab EIC meeting, MIT, April 7 2007 Introduction G from scaling violations of g 1 (x,Q 2 ) The Bjorken Sum Rule G from charm production

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The Gluon Contribution to the Nucleon Spin Antje Bruell, Jlab EIC meeting, MIT, April 7 2007 Introduction G from scaling violations of g 1 (x,Q 2 ) The Bjorken Sum Rule G from charm production

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World Data on g 1 p < 2 orders of magnitude, precision !!! EIC Data on g 1 p Sufficient coverage in x and Q 2 to detrmine G

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G from scaling violations of g 1

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g 1 and the Bjorken Sum Rule

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Bjorken Sum Rule 3-4% precision at various values of Q 2 Needs: O(1%) Ion Polarimetry!!! excellent determination of s (Q 2 ) Sub-1% statistical precision at ELIC (averaged over all Q 2 )

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

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

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Polarized gluon distribution via charm production Precise determination of G/G for 0.003 < x g < 0.4 at common Q 2 of 10 GeV 2 however RHIC SPIN

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If: We can measure the scattered electron even at angles close to 0 0 (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 ( ) Polarized gluon distribution via charm production Precise determination of G/G for 0.003 < x g < 0.4 at common Q 2 of 10 GeV 2

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Need to measure the scattered electron at angles close to 0 0 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- 20 0 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 charm production: detector consequences

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

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The Gluon Contribution to the Nucleon Spin Antje Bruell, Jlab EIC meeting, MIT, April 7 2007 Introduction G from scaling violations of g 1 (x,Q 2 ) The Bjorken Sum Rule G from charm production

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The Gluon Contribution to the Nucleon Spin Antje Bruell, Jlab EIC meeting, MIT, April 7 2007 Introduction G from scaling violations of g 1 (x,Q 2 ) The Bjorken Sum Rule G from charm production

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The Gluon Contribution to the Nucleon Spin Antje Bruell, Jlab EIC meeting, MIT, April 7 2007 Introduction G from scaling violations of g 1 (x,Q 2 ) The Bjorken Sum Rule G from charm production

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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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