CLAS Physics Database

Measurement E213M164

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: 1.425 — 1.45 GeV
Ebeam: 5.754 GeV

Measurement data
ψ(π+), [deg] dσ/dψ(π+), [μb/rad] uncertainty syst. uncert. total uncert.
18.0 0.5174 0.032 0.1232 0.1273
54.0 0.5652 0.0378 0.1283 0.1337
90.0 0.5394 0.0355 0.1249 0.1298
126.0 0.5527 0.0309 0.127 0.1824
162.0 0.6522 0.0417 0.1365 0.1967
198.0 0.6296 0.0321 0.1337 0.1879
234.0 0.5768 0.0347 0.1289 0.1938
270.0 0.5353 0.0347 0.1249 0.1296
306.0 0.4389 0.0359 0.1135 0.1191
342.0 0.4554 0.0311 0.1163 0.1204