${{\mathit \Delta}{(1950)}}$ BREIT-WIGNER PHOTON DECAY AMPLITUDES

${{\mathit \Delta}{(1950)}}$ $\rightarrow$ ${{\mathit N}}{{\mathit \gamma}}$ , helicity-1/2 amplitude A$_{1/2}$ INSPIRE search

B083A1
VALUE (GeV${}^{−1/2}$) DOCUMENT ID TECN  COMMENT
$\bf{ -0.075\text{ to }-0.065\text{ }(\approx-0.070) }$ OUR ESTIMATE
$-0.077$ $\pm0.006$
SARANTSEV
2025
DPWA Multichannel
$-0.0698$ $\pm0.0141$
GOLOVATCH
2019
DPWA ${{\mathit \gamma}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit p}}$
$-0.047$ $\pm0.002$ 1
HUNT
2019
DPWA Multichannel
$-0.083$ $\pm0.004$
WORKMAN
2012A
 DPWA ${{\mathit \gamma}}$ ${{\mathit N}}$ $\rightarrow$ ${{\mathit N}}{{\mathit \pi}}$
• • • We do not use the following data for averages, fits, limits, etc. • • •
$-0.067$ $\pm0.005$
SOKHOYAN
2015A
 DPWA Multichannel
$-0.067$ $\pm0.005$
GUTZ
2014
DPWA Multichannel
$-0.065$ $\pm0.001$ 1
SHRESTHA
2012A
 DPWA Multichannel
$-0.094$
DRECHSEL
2007
DPWA ${{\mathit \gamma}}$ ${{\mathit N}}$ $\rightarrow$ ${{\mathit \pi}}{{\mathit N}}$
1  Statistical error only.
  References:
SARANTSEV 2025
PR C112 015202 Decays of $N^*$ and $?^*$ resonances into $N?$, $??$, and $N?$
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 
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