CLAS Physics Database

Measurement E213M344

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(π+)
Q2: 2.0 — 2.4 GeV2
W: 1.925 — 1.95 GeV
Ebeam: 5.754 GeV

Measurement data
ψ(π+), [deg] dσ/dψ(π+), [μb/rad] uncertainty syst. uncert. total uncert.
18.0 0.9011 0.042 0.1342 0.1406
54.0 0.853 0.0639 0.1339 0.1484
90.0 0.8574 0.0461 0.1361 0.1437
126.0 1.0364 0.0707 0.1523 0.1679
162.0 1.1883 0.0556 0.1621 0.1714
198.0 1.1208 0.0687 0.1577 0.172
234.0 1.0292 0.0488 0.1516 0.1593
270.0 0.8631 0.0436 0.1371 0.1438
306.0 0.8325 0.0394 0.1311 0.1368
342.0 0.8715 0.0395 0.1322 0.138