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Precision Measurement of Virtual Compton Scattering at 12 GeV for Nucleon Profile Analysis

The E12-06-119 proposal focuses on Deeply Virtual Compton Scattering (DVCS) at 12 GeV, aiming to measure Beam Spin and Target Spin Asymmetries with high precision over the CLAS12 kinematic range. Utilizing innovative methods, including harmonic analysis, the experiment seeks to extract both the imaginary and real parts of Compton Form Factors (CFFs) from polarized proton targets. With 80 days of beam time for unpolarized LH2 and 120 days for polarized NH3, this project aims for unprecedented accuracy and will provide critical insights into the nucleon structure and generalized parton distributions (GPDs).

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Precision Measurement of Virtual Compton Scattering at 12 GeV for Nucleon Profile Analysis

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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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