Parity Violating Photoproduction of ${\pi }^{\pm }$ on the $\Delta$ Resonance

Abstract

We analyze the real photon asymmetry $A_{\gamma }^{\pm }$ for the parity violating (PV) ${\pi }^{\pm }$ production on the $\Delta$ resonance via the reactions $\vec{\gamma }+p\to {\Delta }^{+}\to {\pi }^{+}+n$ and $\vec{\gamma }+d\to {\Delta }^0+p\to {\pi }^{-}+p+p$. This asymmetry is nonvanishing due to a PV $\gamma N\Delta$ coupling constant, $d_{\Delta }^{\pm }$. We argue that an experimental determination of this coupling would be of interest for hadron dynamics, possibly shedding light on the S-wave/P-wave puzzle in the hyperon nonleptonic decays and the violation of Hara's theorem in weak radiative hyperon decays.

RevTex, 4 pages + 2 eps figures

References in corpus (3)

• Parity-Violating Pion-Nucleon Coupling h_{πNN}^{(1)} from π^+ Electroproton Production Near the Threshold
• Subleading corrections to parity violating pion photoproduction
• A Measurement of the Branching Ratio and Asymmetry of the Decay Cascade^0-->Sigma^0/gamma

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• Expanding Nuclear Physics Horizons with the Gamma Factory
• Nucleon-to-Delta axial transition form factors in relativistic baryon chiral perturbation theory
• Electroweak Radiative Corrections to Parity-Violating Electroexcitation of the $\Delta$
• The Off-diagonal Goldberger-Treiman Relation and Its Discrepancy
• Measurement of the parity-violating asymmetry in inclusive electroproduction of ${\pi }^{-}$ near the ${\Delta }^0$ resonance
• Connecting the Quenched and Unquenched Worlds via the Large N_c World
• Hadronic weak charges and parity-violating forward Compton scattering
• Masses of Fermions in Supersymmetric Models
• The Δcontribution to the parity-violating nucleon-nucleon force
• Future Directions in Parity Violation: From Quarks to the Cosmos