Comparison between code and data for $\pi$ and $e^+$ background

Different kinematic regions where different fit/parameterization (based on experimental data) are listed as follows:


$\blacklozenge$ epc: photoproduction of pion/nucleons in elastic scattering and resonance regions;
$\blacklozenge$ Wiser: photoproduction of pion/nucleons in DIS (Deep Inelastic Scattering) region;
$\blacklozenge$ qfs: electron scattering in elastic and resonance regions;
$\blacklozenge$ Whitlow: electron scattering in DIS region;



Kinematic region for test run and E99-117 are shown in Figure

Figure: illustration of different kinematic regions

Kinematics: Beam energy = 5.650 GeV, $\theta_e=45^O$
Target: 4 cm LH2 for electron runs, 15 cm LH2 for positron runs

Kin: $p_e$(GeV/c)	1.5	0.9	0.55
$\pi^-$ (epc)	0.000	0.000	0.000
$\pi^-$(Wiser)	5.403	360.431	2807.432
$e^-$(qfs)	0.496	1.709	3.876
$e^-$(Whitlow)	0.452	2.182	3.961
$e^+$(epc)	0.00217	0.00376	0.00741
$e^+$(Wiser)	0.01769	1.62190	18.1455
$\pi^-/e^-$(Wiser/qfs)	10.896	210.849	724.387
$\pi^-/e^-$(Wiser/Whitlow)	11.958	165.156	708.803
$\pi^-/e^-$(epc/qfs)	0.000	0.000	0.000
$\pi^-/e^-$(data,detected)	9.91	68.86	74.31
$\pi^-$ decay ratio	41.70%	33.33%	25.95%
$\pi^-/e^-$(data, corrected)	17.00	206.54	286.33
$e^+/e^-$(epc/qfs)	0.434%	0.224%	0.193%
$e^+/e^-$(epc/Whitlow)	0.485%	0.174%	0.188%
$e^+/e^-$(Wiser/qfs)	3.543%	96.318%	472.09 %
$e^+/e^-$(Wiser/Whitlow)	3.962%	74.887%	460.47 %
$e^+/e^-$(Wiser/Born)	0.0472%	0.830%	7.52%
$e^+/e^-$(data)	0.28%	11.32%	37.72%

$\bigstar$ The radiation length for 4cm liquid H$_2$ target is:
2.8 mil Al + 20 cm Air + 4 cm/2 LH2 = 0.31%
for 15cm liquid H$_2$ target is:
2.8 mil Al + 20 cm Air + 15 cm/2 LH2 = 0.95%
$\bigstar$ Radiation tail of elastic scattering not included yet;
$\bigstar$ Available data show wiser might has an overestimation by a factor of 3;