Armstrong, D. S. (2012) Parity-violating excitation of the Δ and π− photoproduction: New results from G0. Il nuovo cimento C, 35 (4). pp. 16-20. ISSN 1826-9885
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Abstract
We present the first measurement of Ainel, the parity-violating asymmetry in electron scattering from the proton to the Δ resonance, as well as the first measurement of the parity-violating asymmetry in π− photoproduction from the deuteron. Ainel depends on the axial transition form factor GANΔ, which has never been measured in a neutral current process. The asymmetry in pion photoproduction is sensitive to dΔ, a hypothesized parity-violating electric dipole matrix element, which arises from axial-vector radiative corrections. The result for Ainel is in Agreement with theoretical expectation, but is not precise enough to extract information on GANΔ. The pion photoproduction measurement yields a result for dΔ consistent with zero, and which does not favor very large enhancements over the “natural” scale for this matrix element.
| Item Type: | Article |
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| Uncontrolled Keywords: | Inelastic electron scattering to specific states ; Baryon production ; Baryon resonances (S = C = B = 0) |
| Subjects: | 500 Scienze naturali e Matematica > 530 Fisica |
| Depositing User: | Marina Spanti |
| Date Deposited: | 21 Apr 2020 17:42 |
| Last Modified: | 21 Apr 2020 17:42 |
| URI: | http://eprints.bice.rm.cnr.it/id/eprint/17875 |
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