CLAS Physics Database

Measurement E213M237

Experiment: E1-6, 2025
Year: 2001

Measurement comment:

The angle ψ is the angle between the plane defined by the three-momenta of the hadron (in parentheses) and the target proton, and the plane defined by the three-momenta of the other two final-state hadrons

Experiment comment:

Experiment year: 2001—2002
Spokespersons: R.W. Gothe, A. Trivedi
Reaction: ep → π+πp
Polarization: none
Quantity: dσ/dψ(p)
Q2: 2.0 — 2.4 GeV2
W: 1.625 — 1.65 GeV
Ebeam: 5.754 GeV

Measurement data
ψ(p), [deg] dσ/dψ(p), [μb/rad] uncertainty syst. uncert. total uncert.
18.0 0.8503 0.0533 0.1743 0.2458
54.0 0.8141 0.0488 0.1304 0.1392
90.0 0.7745 0.0424 0.1109 0.1188
126.0 0.7379 0.0431 0.1041 0.1126
162.0 0.7799 0.0366 0.1041 0.149
198.0 0.8021 0.0394 0.1059 0.1523
234.0 0.7608 0.0446 0.1053 0.1143
270.0 0.8645 0.0511 0.1205 0.1309
306.0 0.85 0.0504 0.1355 0.1446
342.0 0.8713 0.0477 0.1764 0.2504