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Virtual compton scattering in the resonance region up to the deep inelastic region at backward angles and momentum transfer squared of $Q^2$ = 1.0 $GeV^2$

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Academic year: 2021

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FIG. 1: Kinematics for photon electroproduction on the pro- pro-ton (a) and lowest order amplitudes for VCS Born (b, c), VCS Non-Born (d), Bethe-Heitler (e, f) and t-channel π 0 -exchange (g) [4] processes
FIG. 2: Squared missing mass M X 2 for an experimental setting at W = 1.2 GeV (a) and zoom around the γ peak (b)
FIG. 4: Comparison of VCS data from this experiment (•) at θ ∗ γγ = 167.2 ◦ and RCS data at θ ∗ γγ = 159 − 162 ◦ (⋆) [17], θ γγ∗ = 128 − 132 ◦ (♦) [15], θ ∗ γγ = 141 ◦ (△) [16], θ γγ∗ = 130 − 133 ◦ (◦) [18], θ γγ∗ = 131 ◦ ( ✷ ) [13] and θ γγ∗ = 105 − 128 ◦
TABLE I: ep → epγ cross section (± stat ± syst) at Q 2 =1.0 GeV 2 and cos θ γγ ∗ = −0.975, in fm/MeV/sr 2
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