Differential cross section measurements for γn→π-p above the first nucleon resonance region
2017
The quasifree
γ
d
→
π
−
p
(
p
)
differential cross section has been measured with CLAS at photon beam energies
E
γ
from 0.445 to 2.510 GeV (corresponding to
W
from 1.311 to 2.366 GeV) for pion center-of-mass angles
cos
θ
c
.
m
.
π
from
−
0.72
to 0.92. A correction for final state interactions has been applied to these data to extract the
γ
n
→
π
−
p
differential cross sections. These cross sections are quoted in 8428
(
E
γ
,
cos
θ
c
.
m
.
π
)
bins, a factor of nearly 3 increase in the world statistics for this channel in this kinematic range. These new data help to constrain coupled-channel analysis fits used to disentangle the spectrum of
N
∗
resonances and extract their properties. Selected photon decay amplitudes
N
∗
→
γ
n
at the resonance poles are determined for the first time and are reported here.
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