TY - JOUR
T1 - Beam-Target Helicity Asymmetry for γ→ n→→ π− p in the N* Resonance Region
AU - Ho, D.
AU - Biselli, Angela
PY - 2017/1/1
Y1 - 2017/1/1
N2 - We report the first beam-target double-polarization asymmetries in the γ+n(p)→π−+p(p) reaction spanning the nucleon resonance region from invariant mass W=1500 to 2300 MeV. Circularly polarized photons and longitudinally polarized deuterons in solid hydrogen deuteride (HD) have been used with the CEBAF Large Acceptance Spectrometer (CLAS) at Jefferson Lab. The exclusive final state has been extracted using three very different analyses that show excellent agreement, and these have been used to deduce the E polarization observable for an effective neutron target. These results have been incorporated into new partial wave analyses and have led to significant revisions for several γnN∗ resonance photocouplings.
AB - We report the first beam-target double-polarization asymmetries in the γ+n(p)→π−+p(p) reaction spanning the nucleon resonance region from invariant mass W=1500 to 2300 MeV. Circularly polarized photons and longitudinally polarized deuterons in solid hydrogen deuteride (HD) have been used with the CEBAF Large Acceptance Spectrometer (CLAS) at Jefferson Lab. The exclusive final state has been extracted using three very different analyses that show excellent agreement, and these have been used to deduce the E polarization observable for an effective neutron target. These results have been incorporated into new partial wave analyses and have led to significant revisions for several γnN∗ resonance photocouplings.
UR - https://digitalcommons.fairfield.edu/physics-facultypubs/161
UR - https://libraryapps.fairfield.edu/openurl?institution=01FUNI_INST&vid=01FUNI_INST:MAIN&sid=google&auinit=D&aulast=Ho&atitle=Beam-Target%20Helicity%20Asymmetry%20for%20%CE%B3%E2%86%92%20n%E2%86%92%E2%86%92%20%CF%80%E2%88%92%20p%20in%20the%20N*%20Resonance%20Region&id=doi:10.1103%2FPhysRevLett.118.242002&title=Physical%20review%20letters%20online&volume=118&issue=24&date=2017&spage=242002&issn=0031-9007
U2 - 10.1103/PhysRevLett.118.242002
DO - 10.1103/PhysRevLett.118.242002
M3 - Article
VL - 118
JO - Physical Review Letters
JF - Physical Review Letters
ER -