CLAS Physics Database

Measurement E213M1164

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(p)
Q2: 3.5 — 4.2 GeV2
W: 2.025 — 2.05 GeV
Ebeam: 5.754 GeV

Measurement data
ψ(p), [deg] dσ/dψ(p), [μb/rad] uncertainty syst. uncert. total uncert.
18.0 0.2691 0.0183 0.0641 0.0666
54.0 0.2661 0.0151 0.0549 0.0569
90.0 0.2851 0.0259 0.0563 0.0619
126.0 0.2884 0.0192 0.0588 0.0619
162.0 0.3168 0.0192 0.0607 0.0637
198.0 0.3193 0.02 0.0613 0.0645
234.0 0.2891 0.0194 0.0588 0.0619
270.0 0.2657 0.0156 0.0543 0.0564
306.0 0.3077 0.0269 0.0594 0.0652
342.0 0.2901 0.0195 0.0662 0.0691