CLAS Physics Database

Measurement E213M200

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: 1.525 — 1.55 GeV
Ebeam: 5.754 GeV

Measurement data
ψ(π+), [deg] dσ/dψ(π+), [μb/rad] uncertainty syst. uncert. total uncert.
18.0 0.6369 0.0399 0.1231 0.1294
54.0 0.6645 0.0336 0.1245 0.129
90.0 0.7167 0.0417 0.1301 0.1366
126.0 0.8688 0.0431 0.1426 0.149
162.0 1.0414 0.0527 0.1562 0.2184
198.0 1.1592 0.0543 0.1684 0.2423
234.0 0.8625 0.0419 0.142 0.1481
270.0 0.733 0.0369 0.1302 0.1353
306.0 0.6314 0.0371 0.1223 0.1278
342.0 0.6314 0.0351 0.1227 0.1276