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Determination of the E2/M1 Ratio in the \gamma N \to \Delta(1232) Transition from a Simultaneous Measurement of p(\vec{\gamma},p)\pi^0 and p(\vec{\gamma},\pi^+)n

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arxiv nucl-ex/9908017 v1 pith:BRXOAYCV submitted 1999-08-26 nucl-ex nucl-th

classification nucl-exnucl-th
keywords gammadeltabeentransitionenergyratiosimultaneousamplitudes
verification ladder T0 review T1 audit T2 compute T3 formal
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Tagged linearly polarized photons have been used at the Mainz Microtron MAMI for simultaneous measurements of the p(\vec{\gamma},p)\pi^0 and p(\vec{\gamma},\pi^+)n reaction channels to study the \gamma N \to \Delta(1232) transition. The energy dependence of the magnetic dipole M_{1+}^{3/2} and electric quadrupole E_{1+}^{3/2} amplitudes have been extracted from these data in the photon energy range from 270 to 420 MeV. The E2/M1 ratio for the \gamma N \to \Delta(1232) transition has been determined to be - (2.5+-0.1_{stat}+-0.2_{sys}) % at the resonance position delta_{33}=90^0.

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  1. Multipole structure of the $N \to \Delta$ Transition Generalized Parton Distributions

    hep-ph 2026-07 accept novelty 6.0 of 10

    The four N oΔ transition GPDs decompose into monopole, two dipole and quadrupole multipole GPDs in one-to-one correspondence with light-front helicity amplitudes, defining impact-parameter transition densities at zero...

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