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${{\mathit N}{(1680)}}$ BREIT-WIGNER PHOTON DECAY AMPLITUDES

${{\mathit N}{(1680)}}$ $\rightarrow$ ${{\mathit p}}{{\mathit \gamma}}$ , helicity-1/2 amplitude A$_{1/2}$

VALUE (GeV${}^{−1/2}$)

DOCUMENT ID

TECN

COMMENT

$\bf{ -0.018\text{ to }-0.005\text{ }(\approx-0.010) }$

OUR ESTIMATE

$-0.0278$ $\pm0.0036$

DPWA

${{\mathit \gamma}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit p}}$

$-0.026$ $\pm0.004$

DPWA

Multichannel

$-0.015$ $\pm0.002$

DPWA

Multichannel

$0.003$ $\pm0.001$

DPWA

Multichannel

$-0.007$ $\pm0.002$

DPWA

${{\mathit \gamma}}$ ${{\mathit N}}$ $\rightarrow$ ${{\mathit N}}{{\mathit \pi}}$

$-0.017$ $\pm0.001$

DPWA

${{\mathit \gamma}}$ ${{\mathit N}}$ $\rightarrow$ ${{\mathit \pi}}{{\mathit N}}$

• • We do not use the following data for averages, fits, limits, etc. • •

$-0.013$ $\pm0.003$

DPWA

Multichannel

$-0.017$ $\pm0.001$

DPWA

Multichannel

$-0.025$

DPWA

${{\mathit \gamma}}$ ${{\mathit N}}$ $\rightarrow$ ${{\mathit \pi}}{{\mathit N}}$

¹	Statistical error only.

References:

PL B788 371

First results on nucleon resonance photocouplings from the $\gamma p \to \pi^+\pi^-p$ reaction

PR C99 055205

Updated determination of $N^*$ resonance parameters using a unitary, multichannel formalism

EPJ A51 95

High-Statistics Study of the Reaction ${{\mathit \gamma}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit p}}$2 ${{\mathit \pi}^{0}}$

PR C87 015201

Eta-meson Production in the Resonance Energy Region

EPJ A48 15

Properties of Baryon Resonances from a Multichannel Partial Wave Analysis

PR C86 055203

Multichannel Parametrization of ${{\mathit \pi}}{{\mathit N}}$ Scattering Amplitudes and Extraction of Resonance Parameters

PR C86 015202

Unified Chew-Mandelstam SAID Analysis of Pion Photoproduction Data

EPJ A34 69

Unitary Isobar Model $−$ MAID2007

PR C76 025211

${{\mathit \pi}^{0}}$ Photoproduction on the Proton for Photon Energies from 0.675 to 2.875 GeV

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