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Deeply Virtual Compton Scattering at 12 GeV – E12-06-119

Deeply Virtual Compton Scattering at 12 GeV – E12-06-119. Q hard 2 large. t = Δ 2. low -t process : -t << Q hard 2. Mueller, Ji, Radyushkin (94-96). The DVCS amplitude is expressed in terms of Compton Form Factors at LO: (same for other GPDs). x + ξ. x - ξ. P - Δ /2. P + Δ /2.

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Deeply Virtual Compton Scattering at 12 GeV – E12-06-119

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  1. Deeply Virtual Compton Scattering at 12 GeV – E12-06-119 Qhard2 large t = Δ2 low -t process : -t << Qhard2 Mueller, Ji, Radyushkin (94-96) The DVCS amplitude is expressed in terms of Compton Form Factors at LO: (same for other GPDs) x + ξ x - ξ P - Δ/2 P + Δ/2 GPDs (x, ξ ,t) Mostly H for unpolarized proton target Mostly H for polarized proton target ~ By measuringBeam and Target Spin Asymmetries, and through an harmonicanalysis, One mayextractImaginary and Real parts of CFF : The E12-06-119 proposal aims at measuring the Beam Spin and Target Spin Asymmetries with unprecedented accuracy over the wide CLAS12 kinematical range using 80 (LH2) + 120 (polarized NH3) days of beam time

  2. Beam Spin Asymmetry to 10% statistical error at high xB From 1% statistical error on extracted Twist-2 coefficient IC in standard position – 80 days – 10^35 Lum – VGG model

  3. Target Spin Asymmetry IC in standard position – 120 days – 2x10^35 Lum – VGG model

  4. Global fits by H. Moutarde, H only (PRD79, 094021 (2009)) CLAS12 pseudo data, 80 days of beam time

  5. Extracted Compton Form Factor – From 6 to 12 GeV Global fits by H. Moutarde, H only (PRD79, 094021 (2009)) CLAS12 pseudo data, 80 days of beam time

  6. Building a profile of the nucleon at different xB Projected results

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