Unified Chew-Mandelstam SAID analysis of pion photoproduction data

Abstract

A unified description of single-pion photoproduction data, together with pion-and etahadroproduction data, has been achieved in a Chew-Mandelstam parametrization which is consistent with unitarity at the two-body level. Energy-dependent and single-energy partial wave analyses of pion photoproduction data have been performed and compared to previous SAID fits and multipoles from the Mainz and Bonn-Gatchina groups.

Latest results from FROST at Jefferson Lab

“…these datasets are well-described by SAID [6], MAID 2007 [7], and Bonn-Gatchina [8]. at center-ofmass energies W ≤ 1.8 GeV, but those predictions are far less satisfactory at higher energies.…”

“…At present, ongoing analyses for + photoproduction have provided preliminary results for T and F from the Arizona State University (ASU) group, E from the South Carolina (USC) group, and G from the Edinburgh (UE) group; Figure 1 Preliminary results for E for the reaction + p → p + as a function of center-of-mass energy W using FROST. Curves shown are predictions from SAID [6], eta-MAID 2007 [9], and BonnGatchina [8].…”

Baryons as relativistic three-quark bound states

“…2.1) by fitting to the electroproduction data. Also based on different K-matrix approximations but including a larger number of channels are for example the SAID parametrization [59,60], the KSU model [61,62], the Giessen coupled-channel approach [63][64][65][66] and the Bonn-Gatchina model [67][68][69].…”

Exciting Baryons with MAMI

“…θ Here we use associated Legendre polynomials P m=1 n (cos θ) due to the characteristic sin θ dependence of the transverse polarization dependent cross sections. [7] and BnGa [9] models by the blue and green lines respectively.…”