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Status Report: JLAB Experiment E01-020 Hall A (e,ep) Studies of the Deuteron at High Q 2 Luminita Coman Florida International University Spokespersons: W. Boeglin, M. Jones, P. Ulmer, E. Voutier Ph.D. Students: Luminita Coman - Florida International University Hassan Ibrahim - Old Dominion University - graduated

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Content: Short introduction on (e,ep) reaction Kinematics and Cross Section review Performed Optimizations/Calibrations Applied cuts Cross section results for E01020 experiment R TL response function results Summary

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General Diagram of the 2 H (e,ep)n Reaction High momentum q=(q 0,q) is transferred to the deuteron nucleus p m = q-p f is the missing momentum

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Kinematics q =(,q) where = e-e and q=k i -k f P d =(M D,0) Final state: P f =(E p,p f ) and P R =(E n,p n ) Q 2 = -q 2 = q 2 - 2 = 4e.esin 2 ( e /2) x Bjorken variable: Q 2 /m. momentum conservation: q + P d = P f + P R x = 1 - T n /m n -2T n + q.p n /m n. x>1 => P R ||q nq close to 0 0 x p R ||-q nq close to 180 0

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Theoretical Calculation Glauber Approximation General Eikonal Approximation Shows that relativistic kinematics are important: The interaction is not instantaneous (the nucleons are at rest - GA) R

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Optimizations/Calibrations Detector calibrations done: optics, pointing,timing optimization Detector efficiency studies done: VDC efficiency for Q 2 = 3.5 GeV/c 2 data Scintillator efficiency Cerenkov cut Luminosity studies done: Stable beam analysis React_z dependence

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VDC efficiency for Q 2 = 3.5 GeV/c 2 data Cut on multiplicity in the 4 wire planes: Lmult_uv12>3. && Lmult_uv12<10. Tracks cuts: Exactly one track Eff = 1-track / (3-10) hits (in all planes)

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Scintillator Efficiencies Efficiency (%) vs. Run number Electron arm Scintillator Efficiency S1 plane (blue) S2 plane (red)

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Determined Appropriate Cuts Cut on z difference : abs(z_diff)<0.015 m Cut on react_z : abs(react_z) < 0.05 m Fiducial cut -combined cut on E_miss, P_miss and Q^2 -10

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R - function plot R function Kin e20 Red -experimental Blue - mceep

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R - function plot R function Kin f50 Red -experimental Blue - mceep

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R - function plot R function Kin f10l Red -experimental Blue - mceep

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R - function ratio experimental to mceep R function Kin d20

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Experimental Cross Section Results P_miss = 200 MeV/c From right to left kinematics d20, e20, f20l, g20,h20 Drawn with different marker styles

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Experimental Cross Section Results P_miss = 400 MeV/c From right to left kinematics e40, f40l,g40, i40,j40 Drawn with different marker styles

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Experimental Cross Section Results P_miss = 500 MeV/c From right to left kinematics d50, f50, g50,j50 Drawn with different marker styles

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Cross Section Results: Experimental and Mceep (Laget) P_miss = 200 MeV/c Mceep -blue Experimental - red

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Cross Section Results: Experimental and Mceep (Laget) P_miss = 400 MeV/c Mceep -blue Experimental - red

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Cross Section Results: Experimental and Mceep (Laget) P_miss 500 MeV/c Mceep -blue Experimental - red

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Summary Analysis of the RTL response functions finished Publication under way/thesis defended (Hassan) Mceep simulations done Results for angular distribution of the experimental cross sections close to final

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Summary

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