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Measurement of the Parity-Violating Asymmetry in Inclusive Electroproduction of π- near the Δ0 Resonance

Androić, D. and Liu, J. and McKeown, R. D. (2012) Measurement of the Parity-Violating Asymmetry in Inclusive Electroproduction of π- near the Δ0 Resonance. Physical Review Letters, 108 (12). Art. No. 122002. ISSN 0031-9007. https://resolver.caltech.edu/CaltechAUTHORS:20120417-084735860

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Abstract

The parity-violating (PV) asymmetry of inclusive π- production in electron scattering from a liquid deuterium target was measured at backward angles. The measurement was conducted as a part of the G0 experiment, at a beam energy of 360 MeV. The physics process dominating pion production for these kinematics is quasifree photoproduction off the neutron via the Δ^0 resonance. In the context of heavy-baryon chiral perturbation theory, this asymmetry is related to a low-energy constant d_Δ^- that characterizes the parity-violating γNΔ coupling. Zhu et al. calculated d_Δ^- in a model benchmarked by the large asymmetries seen in hyperon weak radiative decays, and predicted potentially large asymmetries for this process, ranging from A_γ^-=-5.2 to +5.2  ppm. The measurement performed in this work leads to A_γ^-=-0.36±1.06±0.37±0.03  ppm (where sources of statistical, systematic and theoretical uncertainties are included), which would disfavor enchancements considered by Zhu et al. proportional to V_(ud)/V_(us). The measurement is part of a program of inelastic scattering measurements that were conducted by the G0 experiment, seeking to determine the N-Δ axial transition form factors using PV electron scattering.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1103/PhysRevLett.108.122002DOIUNSPECIFIED
http://link.aps.org/doi/10.1103/PhysRevLett.108.122002PublisherUNSPECIFIED
http://prl.aps.org/abstract/PRL/v108/i12/e122002PublisherUNSPECIFIED
Additional Information:© 2012 American Physical Society. Received 7 December 2011; published 20 March 2012. We gratefully acknowledge the strong technical contributions to this experiment from many groups: Caltech, Illinois, LPSC-Grenoble, IPN-Orsay, TRIUMF and particularly the Accelerator and Hall C groups at Jefferson Lab. CNRS (France), DOE (U.S.), NSERC (Canada) and NSF (U.S.) supported this work in part.
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Funding AgencyGrant Number
CNRS (France)UNSPECIFIED
Department of Energy (DOE)UNSPECIFIED
NSERC (Canada)UNSPECIFIED
NSFUNSPECIFIED
Issue or Number:12
Classification Code:PACS: 11.30.Er, 13.60.-r, 14.20.Dh, 25.30.Bf
Record Number:CaltechAUTHORS:20120417-084735860
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20120417-084735860
Official Citation:Measurement of the Parity-Violating Asymmetry in Inclusive Electroproduction of π- near the Δ0 Resonance D. Androić et al. (G0 Collaboration) Published 20 March 2012 (5 pages) 122002
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:30120
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:17 Apr 2012 18:01
Last Modified:03 Oct 2019 03:47

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