Progress on Neutron-Target Multipoles above 1 GeV

Publisher： Edp Sciences

E-ISSN： 2100-014x|37|issue|08005-08005

ISSN： 2100-014x

Source： EPJ Web of Conference, Vol.37, Iss.issue, 2012-12, pp. : 08005-08005

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Abstract

We report a new extraction of nucleon resonance couplings using π− photo-production cross sections on the neutron. The world database for the process γn → π−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 πN 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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