CLAS Physics Database

Measurement E213M245

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: 1.65 — 1.675 GeV
Ebeam: 5.754 GeV

Measurement data
ψ(π+), [deg] dσ/dψ(π+), [μb/rad] uncertainty syst. uncert. total uncert.
18.0 0.9071 0.0455 0.1694 0.244
54.0 0.8656 0.0404 0.1676 0.1724
90.0 1.0186 0.0557 0.1853 0.1935
126.0 1.239 0.0647 0.2094 0.2192
162.0 1.3965 0.0652 0.2244 0.2337
198.0 1.3754 0.0703 0.2227 0.2335
234.0 1.2899 0.0688 0.2163 0.227
270.0 1.0572 0.0552 0.1909 0.1987
306.0 0.903 0.0474 0.1714 0.1778
342.0 0.8705 0.0458 0.1649 0.241