pdgLive Home   >   Baryon Summary Table   >   ${{\mathit \Delta}{(1232)}}$   >   ${{\mathit \Delta}{(1232)}}$ $\rightarrow$ ${{\mathit N}}{{\mathit \gamma}}$ , ${{\mathit E}_{{2}}}$ /${{\mathit M}_{{1}}}$ ratio

${{\mathit \Delta}{(1232)}}$ 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  

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.

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

References:

DRECHSEL 2007 EPJ A34 69 Unitary Isobar Model $−$ MAID2007 AHRENS 2004A EPJ A21 323 Helicity Dependence of the ${{\mathit \gamma}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit N}}{{\mathit \pi}}$ Channels and Multipole Analysis in the ${{\mathit \Delta}}$ Region ARNDT 2002 PR C66 055213 Analysis of Pion Photoproduction Data PENNER 2002D PR C66 055212 Vector Meson Production and Nucleon Resonance Analysis in a Coupled Channel Approach for Energies ${\mathit m}_{{{\mathit N}}}$ $<$ $\sqrt {s }$ $<$ 2 GeV. 2. Photon Induced Results BLANPIED 2001 PR C64 025203 ${{\mathit N}}$ $\rightarrow$ ${{\mathit \Delta}}$ Transition and Proton Polarizabilities from Measurements of ${{\mathit p}}$ (${{\mathit \gamma}}$ $↑$, ${{\mathit \gamma}}$ ), ${{\mathit p}}$ (${{\mathit \gamma}}$ $↑$, ${{\mathit \pi}^{0}}$ ), and ${{\mathit p}}$ (${{\mathit \gamma}}$ $↑$, ${{\mathit \pi}^{+}}$ ) GALLER 2001 PL B503 245 Compton Scattering by the Proton BECK 2000 PR C61 035204 Determination of the $\mathit E2/\mathit M$1 Ratio in the ${{\mathit \gamma}}$ ${{\mathit N}}$ $\rightarrow$ ${{\mathit \Delta}{(1232)}}$ Transition from a Simultaneous Measurement of ${{\mathit p}}$ (${{\mathit \gamma}}$ $↑$, ${{\mathit p}}$ )${{\mathit \pi}^{0}}$ and ${{\mathit p}}$ (${{\mathit \gamma}}$ $↑$, ${{\mathit \pi}^{+}}$ )${{\mathit n}}$ HANSTEIN 1998 NP A632 561 Multipole Analysis of Pion Photoproduction Based on Fixed $\mathit t$ Dispersion Relations and Unitarity ARNDT 1997 PR C56 577 Pion Photoproduction in the ${{\mathit \Delta}}$ Resonance Region BECK 1997 PRL 78 606 Measurement of the $\mathit E2/\mathit M$1 Ratio in the ${{\mathit N}}$ $\rightarrow$ ${{\mathit \Delta}}$ Transition using the Reaction ${{\mathit p}}$ (${{\mathit \gamma}}$ $↑$, ${{\mathit p}}$ ) ${{\mathit \pi}^{0}}$ Also PRL 79 4510 Replay on BECK 1997 Measurement of the $\mathit E2/\mathit M$1 Ratio in the ${{\mathit N}}$ $\rightarrow$ ${{\mathit \Delta}}$ Transition using the Reaction ${{\mathit p}}$ (${{\mathit \gamma}}$ $↑$, ${{\mathit p}}$ ) ${{\mathit \pi}^{0}}$ Also PRL 79 4512 Measurement of the $\mathit E2/\mathit M$1 Ratio in the ${{\mathit N}}$ $\rightarrow$ ${{\mathit \Delta}}$ Transition using the Reaction ${{\mathit p}}$ (${{\mathit \gamma}}$ $↑$, ${{\mathit p}}$ ) ${{\mathit \pi}^{0}}$ Also PRL 79 4515 (erratum) Erratum: (BECK 1997 ) Measurement of the $\mathit E2/\mathit M$1 Ratio in the ${{\mathit N}}$ $\rightarrow$ ${{\mathit \Delta}}$ Transition using the Reaction ${{\mathit p}}$ (${{\mathit \gamma}}$ $↑$, ${{\mathit p}}$ ) ${{\mathit \pi}^{0}}$ BLANPIED 1997 PRL 79 4337 ${{\mathit n}}$ $\rightarrow$ ${{\mathit \Delta}}$ Transition from Simultaneous Measurements of ${{\mathit p}}$ (${{\mathit \gamma}}$ , ${{\mathit \pi}}$ ) and ${{\mathit p}}$ (${{\mathit \gamma}}$ $↑$, ${{\mathit \gamma}}$ ) DAVIDSON 1997 PRL 79 4509 Mainz Measurement of the $\mathit E2/\mathit M$1 Ratio in the ${{\mathit N}}$ $−$ ${{\mathit \Delta}}$ Transition. (A Comment on the Letter by R.Beck $\mathit et~al$, PRL 78, 606 (BECK 1997 ))

Except where otherwise noted, content of the 2022 Review of Particle Physics is licensed under a Creative Commons Attribution-NonCommercial 4.0 International (CC BY-NC 4.0) license. The publication of the Review of Particle Physics is supported by US DOE, MEXT (Japan), INFN (Italy), JPS and CERN. Individual collaborators receive support for their PDG activities from their respective institutes or funding agencies. © 2022. See LBNL disclaimers.