${{\mathit \Delta}{(1232)}}$ BREIT-WIGNER PHOTON DECAY AMPLITUDES

Papers on ${{\mathit \gamma}}{{\mathit N}}$ amplitudes predating 1981 may be found in our 2006 edition, Journal of Physics G33 1 (2006).

${{\mathit \Delta}{(1232)}}$ $\rightarrow$ ${{\mathit N}}{{\mathit \gamma}}$ , helicity-1/2 amplitude A$_{1/2}$

INSPIRE   PDGID:
B033A1
VALUE (GeV${}^{−1/2}$) DOCUMENT ID TECN  COMMENT
$\bf{ -0.142\text{ to }-0.129\text{ }(\approx-0.135) }$ OUR ESTIMATE
$-0.146$ $\pm0.002$ 1
HUNT
2019
DPWA Multichannel
$-0.131$ $\pm0.004$
ANISOVICH
2012A
 DPWA Multichannel
$-0.139$ $\pm0.002$ 1
WORKMAN
2012A
 DPWA ${{\mathit \gamma}}$ ${{\mathit N}}$ $\rightarrow$ ${{\mathit N}}{{\mathit \pi}}$
$-0.139$ $\pm0.004$ 1
DUGGER
2007
DPWA ${{\mathit \gamma}}$ ${{\mathit N}}$ $\rightarrow$ ${{\mathit \pi}}{{\mathit N}}$
$-0.137$ $\pm0.005$
AHRENS
2004A
 DPWA $\vec\gamma\vec {{\mathit p}}$ $\rightarrow$ ${{\mathit N}}{{\mathit \pi}}$
$-0.1357$ $\pm0.0013$ $\pm0.0037$
BLANPIED
2001
LEGS ${{\mathit \gamma}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit p}}{{\mathit \gamma}}$, ${{\mathit p}}{{\mathit \pi}^{0}}$, ${{\mathit n}}{{\mathit \pi}^{+}}$
$-0.131$ $\pm0.001$ 1
BECK
2000
IPWA $\vec\gamma$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit p}}{{\mathit \pi}^{0}}$, ${{\mathit n}}{{\mathit \pi}^{+}}$
$-0.140$ $\pm0.005$
KAMALOV
1999
DPWA ${{\mathit \gamma}}$ ${{\mathit N}}$ $\rightarrow$ ${{\mathit \pi}}{{\mathit N}}$
$-0.1294$ $\pm0.0013$
HANSTEIN
1998
IPWA ${{\mathit \gamma}}$ ${{\mathit N}}$ $\rightarrow$ ${{\mathit \pi}}{{\mathit N}}$
$-0.1278$ $\pm0.0012$
DAVIDSON
1997
DPWA ${{\mathit \gamma}}$ ${{\mathit N}}$ $\rightarrow$ ${{\mathit \pi}}{{\mathit N}}$
• • We do not use the following data for averages, fits, limits, etc. • •
$-0.137$ $\pm0.001$ 1
SHRESTHA
2012A
 DPWA Multichannel
$-0.136$ $\pm0.005$
ANISOVICH
2010
DPWA Multichannel
$-0.140$
DRECHSEL
2007
DPWA ${{\mathit \gamma}}$ ${{\mathit N}}$ $\rightarrow$ ${{\mathit \pi}}{{\mathit N}}$
$-0.129$ $\pm0.001$
ARNDT
2002
DPWA ${{\mathit \gamma}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit N}}{{\mathit \pi}}$
$-0.128$
PENNER
2002D
 DPWA Multichannel
$-0.1312$
HANSTEIN
1998
DPWA ${{\mathit \gamma}}$ ${{\mathit N}}$ $\rightarrow$ ${{\mathit \pi}}{{\mathit N}}$
1  Statistical error only.
References