CLAS Physics Database

Measurement E213M299

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: 1.8 — 1.825 GeV
Ebeam: 5.754 GeV

Measurement data
ψ(π+), [deg] dσ/dψ(π+), [μb/rad] uncertainty syst. uncert. total uncert.
18.0 0.9426 0.0503 0.1386 0.1474
54.0 0.9126 0.0456 0.1375 0.1448
90.0 1.0849 0.0644 0.1546 0.1675
126.0 1.2059 0.0699 0.1677 0.1816
162.0 1.2763 0.0551 0.1725 0.2458
198.0 1.2327 0.0489 0.1689 0.246
234.0 1.1409 0.0494 0.1608 0.1682
270.0 0.9947 0.0538 0.1487 0.1581
306.0 0.9177 0.0459 0.1382 0.1456
342.0 0.9369 0.0422 0.1374 0.1437