CLAS Physics Database

Measurement E213M507

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: 2.4 — 3.0 GeV2
W: 1.65 — 1.675 GeV
Ebeam: 5.754 GeV

Measurement data
ψ(p), [deg] dσ/dψ(p), [μb/rad] uncertainty syst. uncert. total uncert.
18.0 0.8015 0.0579 0.1472 0.2159
54.0 0.648 0.0336 0.1065 0.1484
90.0 0.6274 0.0349 0.0972 0.1033
126.0 0.6038 0.0374 0.0916 0.099
162.0 0.6904 0.0301 0.1007 0.1051
198.0 0.6984 0.0297 0.1021 0.1063
234.0 0.6497 0.035 0.0978 0.1039
270.0 0.5892 0.0441 0.0929 0.1028
306.0 0.6545 0.0358 0.1075 0.1492
342.0 0.7311 0.0503 0.1394 0.205