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${{\mathit \Delta}{(1232)}}$ 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).

${{\mathit \Delta}{(1232)}}$ $\rightarrow$ ${{\mathit N}}{{\mathit \gamma}}$, ${{\mathit E}_{{{2}}}}/{{\mathit M}_{{{1}}}}$ ratio

INSPIRE   PDGID:

B033EMR

VALUE DOCUMENT ID TECN  COMMENT $\bf{ -0.030\text{ to }-0.020\text{ }(\approx-0.025) }$ OUR ESTIMATE $-0.0274$ $\pm0.0003$ $\pm0.0030$ AHRENS 2004 A DPWA $\vec\gamma\vec {{\mathit p}}$ $\rightarrow$ ${{\mathit N}}{{\mathit \pi}}$ $-0.020$ $\pm0.002$ ARNDT 2002 DPWA ${{\mathit \gamma}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit N}}{{\mathit \pi}}$ $-0.0307$ $\pm0.0026$ $\pm0.0024$ BLANPIED 2001 LEGS ${{\mathit \gamma}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit p}}{{\mathit \gamma}}$, ${{\mathit p}}{{\mathit \pi}^{0}}$, ${{\mathit n}}{{\mathit \pi}^{+}}$ $-0.016$ $\pm0.004$ $\pm0.002$ GALLER 2001 DPWA ${{\mathit \gamma}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit p}}$ $-0.025$ $\pm0.001$ $\pm0.002$ BECK 2000 IPWA $\vec\gamma$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit p}}{{\mathit \pi}^{0}}$, ${{\mathit n}}{{\mathit \pi}^{+}}$ $-0.0233$ $\pm0.0017$ HANSTEIN 1998 IPWA ${{\mathit \gamma}}$ ${{\mathit N}}$ $\rightarrow$ ${{\mathit \pi}}{{\mathit N}}$ $-0.015$ $\pm0.005$ 1 ARNDT 1997 IPWA ${{\mathit \gamma}}$ ${{\mathit N}}$ $\rightarrow$ ${{\mathit \pi}}{{\mathit N}}$ $-0.0319$ $\pm0.0024$ DAVIDSON 1997 DPWA ${{\mathit \gamma}}$ ${{\mathit N}}$ $\rightarrow$ ${{\mathit \pi}}{{\mathit N}}$ • • We do not use the following data for averages, fits, limits, etc. • • $-0.022$ DRECHSEL 2007 DPWA ${{\mathit \gamma}}$ ${{\mathit N}}$ $\rightarrow$ ${{\mathit \pi}}{{\mathit N}}$ $-0.026$ PENNER 2002 D DPWA Multichannel $-0.0254$ $\pm0.0010$ HANSTEIN 1998 DPWA ${{\mathit \gamma}}$ ${{\mathit N}}$ $\rightarrow$ ${{\mathit \pi}}{{\mathit N}}$ $-0.025$ $\pm0.002$ $\pm0.002$ BECK 1997 IPWA ${{\mathit \gamma}}$ ${{\mathit N}}$ $\rightarrow$ ${{\mathit \pi}}{{\mathit N}}$ $-0.030$ $\pm0.003$ $\pm0.002$ BLANPIED 1997 DPWA ${{\mathit \gamma}}$ ${{\mathit N}}$ $\rightarrow$ ${{\mathit \pi}}{{\mathit N}}$, ${{\mathit \gamma}}{{\mathit N}}$ 1  This ARNDT 1997 value is very sensitive to the database being fitted. The result is from a fit to the full pion photoproduction database, apart from the BLANPIED 1997 cross-section measurements.

References

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