Progress on Neutron-Target Multipoles above 1 GeV
I.I. Strakovsky (GW), W. Chen (Duke), H. Gao (Duke), W.J. Briscoe, (GW), D. Dutta (MSU), A.E. Kudryavtsev (ITEP, GW), M. Mirazite (INFN), M., Paris (LANL), P. Rossi (INFN), S. Stepanyan (JLab), V.E. Tarasov (ITEP), and, R.L. Workman (GW)
TL;DR
This paper presents a new extraction of neutron resonance couplings from pi- photoproduction data above 1 GeV, utilizing an expanded database and improved analysis techniques, revealing significant high-energy behavior changes.
Contribution
It introduces an updated extraction method for nucleon resonance couplings using new CLAS data and advanced final-state interaction modeling.
Findings
Quadrupled the world database for gn-->pi-p above 1 GeV
Observed significant changes in high-energy cross sections and amplitudes
Provided updated resonance coupling values compared to previous results
Abstract
We report a new extraction of nucleon resonance couplings using pi- photoproduction cross sections on the neutron. The world database for the process gn-->pi-p above 1 GeV has quadrupled with the addition of new differential cross sections from the CEBAF Large Acceptance Spectrometer (CLAS) at Jefferson Lab in Hall B. Differential cross sections from CLAS have been improved with a new final-state interaction determination using a diagrammatic technique taking into account the SAID phenomenological NN and piN final-state interaction amplitudes. Resonance couplings have been extracted and compared to previous determinations. With the addition of these new cross sections, significant changes are seen in the high-energy behavior of the SAID cross sections and amplitudes.
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