Spin Asymmetries and Helicity Amplitudes in Photo-Production from Polarized Neutrons

Sandorfi, Andrew M.

doi:10.1007/s00601-018-1478-4

Spin Asymmetries and Helicity Amplitudes in Photo-Production from Polarized Neutrons

Journal Article · Fri Nov 30 23:00:00 EST 2018 · Few-Body Systems

DOI:https://doi.org/10.1007/s00601-018-1478-4· OSTI ID:1484448

^[1]

Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)

Pseudoscalar meson photoproduction experiments lead the search for an expanded $N^*$ spectroscopy that is required by lattice solutions of QCD. Extensive data have been collected with proton targets that can potentially over-determine the production amplitude and allow a search for weak resonances. In contrast, data on photoproduction from neutrons is drastically limited. Both are needed since the $$\gamma p N^*$$ and $$\gamma n N^*$$ photo-couplings to I = 1/2 states are different and provide complementary information on the mechanisms for resonance excitation. The main subtleties in experiments with an effective polarized neutron target are reviewed. The considerable impact of new polarization data on multipole analyses are discussed, using the example of recent $$\pi^- p$$ measurements of the beam-target helicity asymmetry ($$E$$) from polarized $$H\!D$$ in CLAS at Jefferson Lab. Here, new partial wave analyses incorporating these data have found significant changes in helicity amplitudes of some established resonances, and signatures of weak resonances that previously were observed only in hyperon decay channels.

View Accepted Manuscript (DOE)

Research Organization:: Thomas Jefferson National Accelerator Facility, Newport News, VA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)

Grant/Contract Number:: AC05-06OR23177

OSTI ID:: 1484448

Alternate ID(s):: OSTI ID: 22806176

Report Number(s):: JLAB-PHY--18-2677; DOE/OR/23177--4399; PII: 1478

Journal Information:: Few-Body Systems, Journal Name: Few-Body Systems Journal Issue: 1 Vol. 60; ISSN 0177-7963

Publisher:: SpringerCopyright Statement

Country of Publication:: United States

Language:: English

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