CLAS Physics Database

Measurement E213M533

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: 2.4 — 3.0 GeV2
W: 1.725 — 1.75 GeV
Ebeam: 5.754 GeV

Measurement data
ψ(π+), [deg] dσ/dψ(π+), [μb/rad] uncertainty syst. uncert. total uncert.
18.0 0.9156 0.0367 0.1386 0.1433
54.0 0.9066 0.0417 0.1394 0.1455
90.0 0.8831 0.0398 0.1392 0.1447
126.0 1.0241 0.0401 0.1535 0.1586
162.0 1.0497 0.0416 0.1567 0.2112
198.0 0.9799 0.0424 0.1486 0.2058
234.0 1.0088 0.0561 0.1516 0.1616
270.0 0.8882 0.0431 0.1396 0.1461
306.0 0.9146 0.0591 0.14 0.1519
342.0 0.9383 0.0372 0.1409 0.1458