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${{\mathit \Delta}{(1905)}}$ BREIT-WIGNER PHOTON DECAY AMPLITUDES

${{\mathit \Delta}{(1905)}}$ $\rightarrow$ ${{\mathit N}}{{\mathit \gamma}}$ , helicity-1/2 amplitude A$_{1/2}$

INSPIRE   PDGID:

B011A1

VALUE (GeV${}^{−1/2}$) DOCUMENT ID TECN  COMMENT $\bf{ 0.017\text{ to }0.027\text{ }(\approx0.022) }$ OUR ESTIMATE $0.019$ $\pm0.0076$ GOLOVATCH 2019 DPWA ${{\mathit \gamma}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit p}}$ $0.077$ $\pm0.010$ 1 HUNT 2019 DPWA Multichannel $0.025$ $\pm0.005$ SOKHOYAN 2015 A DPWA Multichannel $0.020$ $\pm0.002$ 1 DUGGER 2013 DPWA ${{\mathit \gamma}}$ ${{\mathit N}}$ $\rightarrow$ ${{\mathit \pi}}{{\mathit N}}$ $0.019$ $\pm0.002$ 1 WORKMAN 2012 A DPWA ${{\mathit \gamma}}$ ${{\mathit N}}$ $\rightarrow$ ${{\mathit \pi}}{{\mathit N}}$ • • We do not use the following data for averages, fits, limits, etc. • • $0.025$ $\pm0.005$ GUTZ 2014 DPWA Multichannel $0.025$ $\pm0.004$ ANISOVICH 2012 A DPWA Multichannel $0.066$ $\pm0.018$ 1 SHRESTHA 2012 A DPWA Multichannel $0.018$ DRECHSEL 2007 DPWA ${{\mathit \gamma}}$ ${{\mathit N}}$ $\rightarrow$ ${{\mathit \pi}}{{\mathit N}}$ 1  Statistical error only.

References:

GOLOVATCH 2019 PL B788 371 First results on nucleon resonance photocouplings from the $\gamma p \to \pi^+\pi^-p$ reaction HUNT 2019 PR C99 055205 Updated determination of $N^*$ resonance parameters using a unitary, multichannel formalism SOKHOYAN 2015A EPJ A51 95 High-Statistics Study of the Reaction ${{\mathit \gamma}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit p}}$2 ${{\mathit \pi}^{0}}$ GUTZ 2014 EPJ A50 74 High Statistics Study of the Reaction DUGGER 2013 PR C88 065203 Beam Asymmetry for ${{\mathit \pi}^{+}}$ and ${{\mathit \pi}^{0}}$ Photoproduction on the Proton for Photon Energies from 1.102 to 1.862 GeV ANISOVICH 2012A EPJ A48 15 Properties of Baryon Resonances from a Multichannel Partial Wave Analysis SHRESTHA 2012A PR C86 055203 Multichannel Parametrization of ${{\mathit \pi}}{{\mathit N}}$ Scattering Amplitudes and Extraction of Resonance Parameters WORKMAN 2012A PR C86 015202 Unified Chew-Mandelstam SAID Analysis of Pion Photoproduction Data DRECHSEL 2007 EPJ A34 69 Unitary Isobar Model $−$ MAID2007

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