Measurement of the parity-violating asymmetry in inclusive electroproduction of π - Near the Δ0 resonance

D. Androić; D. S. Armstrong; J. Arvieux; S. L. Bailey; D. H. Beck; E. J. Beise; J. Benesch; F. Benmokhtar; L. Bimbot; J. Birchall; P. Bosted; H. Breuer; C. L. Capuano; Y. C. Chao; A. Coppens; C. A. Davis; C. Ellis; G. Flores; G. Franklin; C. Furget; D. Gaskell; M. T.W. Gericke; J. Grames; G. Guillard; J. Hansknecht; T. Horn; M. K. Jones; P. M. King; W. Korsch; S. Kox; L. Lee; J. Liu; A. Lung; J. Mammei; J. W. Martin; R. D. McKeown; A. Micherdzinska; M. Mihovilovic; H. Mkrtchyan; M. Muether; S. A. Page; V. Papavassiliou; S. F. Pate; S. K. Phillips; P. Pillot; M. L. Pitt; M. Poelker; B. Quinn; W. D. Ramsay; J. S. Real; J. Roche; P. Roos; J. Schaub; T. Seva; N. Simicevic; G. R. Smith; D. T. Spayde; M. Stutzman; R. Suleiman; V. Tadevosyan; W. T.H. Van Oers; M. Versteegen; E. Voutier; W. Vulcan; S. P. Wells; S. E. Williamson; S. A. Wood

doi:10.1103/PhysRevLett.108.122002

Measurement of the parity-violating asymmetry in inclusive electroproduction of π ^- Near the Δ0 resonance

D. Androić, D. S. Armstrong, J. Arvieux, S. L. Bailey, D. H. Beck, E. J. Beise, J. Benesch, F. Benmokhtar, L. Bimbot, J. Birchall, P. Bosted, H. Breuer, C. L. Capuano, Y. C. Chao, A. Coppens, C. A. Davis, C. Ellis, G. Flores, G. Franklin, C. FurgetD. Gaskell, M. T.W. Gericke, J. Grames, G. Guillard, J. Hansknecht, T. Horn, M. K. Jones, P. M. King, W. Korsch, S. Kox, L. Lee, J. Liu, A. Lung, J. Mammei, J. W. Martin, R. D. McKeown, A. Micherdzinska, M. Mihovilovic, H. Mkrtchyan, M. Muether, S. A. Page, V. Papavassiliou, S. F. Pate, S. K. Phillips, P. Pillot, M. L. Pitt, M. Poelker, B. Quinn, W. D. Ramsay, J. S. Real, J. Roche, P. Roos, J. Schaub, T. Seva, N. Simicevic, G. R. Smith, D. T. Spayde, M. Stutzman, R. Suleiman, V. Tadevosyan, W. T.H. Van Oers, M. Versteegen, E. Voutier, W. Vulcan, S. P. Wells, S. E. Williamson, S. A. Wood

Physics And Astronomy

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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 Δ0 resonance. In the context of heavy-baryon chiral perturbation theory, this asymmetry is related to a low-energy constant dΔ- that characterizes the parity-violating γNΔ coupling. Zhu et al. calculated dΔ- in a model benchmarked by the large asymmetries seen in hyperon weak radiative decays, and predicted potentially large asymmetries for this process, ranging from Aγ-=-5.2 to +5.2ppm. The measurement performed in this work leads to Aγ-=-0.36±1.06±0.37±0.03ppm (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.

Original language	English
Article number	122002
Journal	Physical Review Letters
Volume	108
Issue number	12
DOIs	https://doi.org/10.1103/PhysRevLett.108.122002
State	Published - Mar 20 2012

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Physics and Astronomy (all)

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10.1103/PhysRevLett.108.122002

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Androić, D., Armstrong, D. S., Arvieux, J., Bailey, S. L., Beck, D. H., Beise, E. J., Benesch, J., Benmokhtar, F., Bimbot, L., Birchall, J., Bosted, P., Breuer, H., Capuano, C. L., Chao, Y. C., Coppens, A., Davis, C. A., Ellis, C., Flores, G., Franklin, G., ... Wood, S. A. (2012). Measurement of the parity-violating asymmetry in inclusive electroproduction of π ^- Near the Δ0 resonance. Physical Review Letters, 108(12), Article 122002. https://doi.org/10.1103/PhysRevLett.108.122002

@article{22ffec4bd81e4321979b66b6182cd7dc,

title = "Measurement of the parity-violating asymmetry in inclusive electroproduction of π - Near the Δ0 resonance",

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 Δ0 resonance. In the context of heavy-baryon chiral perturbation theory, this asymmetry is related to a low-energy constant dΔ- that characterizes the parity-violating γNΔ coupling. Zhu et al. calculated dΔ- in a model benchmarked by the large asymmetries seen in hyperon weak radiative decays, and predicted potentially large asymmetries for this process, ranging from Aγ-=-5.2 to +5.2ppm. The measurement performed in this work leads to Aγ-=-0.36±1.06±0.37±0.03ppm (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.",

author = "D. Androi{\'c} and Armstrong, {D. S.} and J. Arvieux and Bailey, {S. L.} and Beck, {D. H.} and Beise, {E. J.} and J. Benesch and F. Benmokhtar and L. Bimbot and J. Birchall and P. Bosted and H. Breuer and Capuano, {C. L.} and Chao, {Y. C.} and A. Coppens and Davis, {C. A.} and C. Ellis and G. Flores and G. Franklin and C. Furget and D. Gaskell and Gericke, {M. T.W.} and J. Grames and G. Guillard and J. Hansknecht and T. Horn and Jones, {M. K.} and King, {P. M.} and W. Korsch and S. Kox and L. Lee and J. Liu and A. Lung and J. Mammei and Martin, {J. W.} and McKeown, {R. D.} and A. Micherdzinska and M. Mihovilovic and H. Mkrtchyan and M. Muether and Page, {S. A.} and V. Papavassiliou and Pate, {S. F.} and Phillips, {S. K.} and P. Pillot and Pitt, {M. L.} and M. Poelker and B. Quinn and Ramsay, {W. D.} and Real, {J. S.} and J. Roche and P. Roos and J. Schaub and T. Seva and N. Simicevic and Smith, {G. R.} and Spayde, {D. T.} and M. Stutzman and R. Suleiman and V. Tadevosyan and {Van Oers}, {W. T.H.} and M. Versteegen and E. Voutier and W. Vulcan and Wells, {S. P.} and Williamson, {S. E.} and Wood, {S. A.}",

year = "2012",

month = mar,

day = "20",

doi = "10.1103/PhysRevLett.108.122002",

language = "English",

volume = "108",

number = "12",

}

Androić, D, Armstrong, DS, Arvieux, J, Bailey, SL, Beck, DH, Beise, EJ, Benesch, J, Benmokhtar, F, Bimbot, L, Birchall, J, Bosted, P, Breuer, H, Capuano, CL, Chao, YC, Coppens, A, Davis, CA, Ellis, C, Flores, G, Franklin, G, Furget, C, Gaskell, D, Gericke, MTW, Grames, J, Guillard, G, Hansknecht, J, Horn, T, Jones, MK, King, PM, Korsch, W, Kox, S, Lee, L, Liu, J, Lung, A, Mammei, J, Martin, JW, McKeown, RD, Micherdzinska, A, Mihovilovic, M, Mkrtchyan, H, Muether, M, Page, SA, Papavassiliou, V, Pate, SF, Phillips, SK, Pillot, P, Pitt, ML, Poelker, M, Quinn, B, Ramsay, WD, Real, JS, Roche, J, Roos, P, Schaub, J, Seva, T, Simicevic, N, Smith, GR, Spayde, DT, Stutzman, M, Suleiman, R, Tadevosyan, V, Van Oers, WTH, Versteegen, M, Voutier, E, Vulcan, W, Wells, SP, Williamson, SE & Wood, SA 2012, 'Measurement of the parity-violating asymmetry in inclusive electroproduction of π ^- Near the Δ0 resonance', Physical Review Letters, vol. 108, no. 12, 122002. https://doi.org/10.1103/PhysRevLett.108.122002

TY - JOUR

T1 - Measurement of the parity-violating asymmetry in inclusive electroproduction of π - Near the Δ0 resonance

AU - Androić, D.

AU - Armstrong, D. S.

AU - Arvieux, J.

AU - Bailey, S. L.

AU - Beck, D. H.

AU - Beise, E. J.

AU - Benesch, J.

AU - Benmokhtar, F.

AU - Bimbot, L.

AU - Birchall, J.

AU - Bosted, P.

AU - Breuer, H.

AU - Capuano, C. L.

AU - Chao, Y. C.

AU - Coppens, A.

AU - Davis, C. A.

AU - Ellis, C.

AU - Flores, G.

AU - Franklin, G.

AU - Furget, C.

AU - Gaskell, D.

AU - Gericke, M. T.W.

AU - Grames, J.

AU - Guillard, G.

AU - Hansknecht, J.

AU - Horn, T.

AU - Jones, M. K.

AU - King, P. M.

AU - Korsch, W.

AU - Kox, S.

AU - Lee, L.

AU - Liu, J.

AU - Lung, A.

AU - Mammei, J.

AU - Martin, J. W.

AU - McKeown, R. D.

AU - Micherdzinska, A.

AU - Mihovilovic, M.

AU - Mkrtchyan, H.

AU - Muether, M.

AU - Page, S. A.

AU - Papavassiliou, V.

AU - Pate, S. F.

AU - Phillips, S. K.

AU - Pillot, P.

AU - Pitt, M. L.

AU - Poelker, M.

AU - Quinn, B.

AU - Ramsay, W. D.

AU - Real, J. S.

AU - Roche, J.

AU - Roos, P.

AU - Schaub, J.

AU - Seva, T.

AU - Simicevic, N.

AU - Smith, G. R.

AU - Spayde, D. T.

AU - Stutzman, M.

AU - Suleiman, R.

AU - Tadevosyan, V.

AU - Van Oers, W. T.H.

AU - Versteegen, M.

AU - Voutier, E.

AU - Vulcan, W.

AU - Wells, S. P.

AU - Williamson, S. E.

AU - Wood, S. A.

PY - 2012/3/20

Y1 - 2012/3/20

N2 - 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 Δ0 resonance. In the context of heavy-baryon chiral perturbation theory, this asymmetry is related to a low-energy constant dΔ- that characterizes the parity-violating γNΔ coupling. Zhu et al. calculated dΔ- in a model benchmarked by the large asymmetries seen in hyperon weak radiative decays, and predicted potentially large asymmetries for this process, ranging from Aγ-=-5.2 to +5.2ppm. The measurement performed in this work leads to Aγ-=-0.36±1.06±0.37±0.03ppm (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.

AB - 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 Δ0 resonance. In the context of heavy-baryon chiral perturbation theory, this asymmetry is related to a low-energy constant dΔ- that characterizes the parity-violating γNΔ coupling. Zhu et al. calculated dΔ- in a model benchmarked by the large asymmetries seen in hyperon weak radiative decays, and predicted potentially large asymmetries for this process, ranging from Aγ-=-5.2 to +5.2ppm. The measurement performed in this work leads to Aγ-=-0.36±1.06±0.37±0.03ppm (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.

UR - http://www.scopus.com/inward/record.url?scp=84859067798&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84859067798&partnerID=8YFLogxK

U2 - 10.1103/PhysRevLett.108.122002

DO - 10.1103/PhysRevLett.108.122002

M3 - Article

AN - SCOPUS:84859067798

SN - 0031-9007

VL - 108

JO - Physical Review Letters

JF - Physical Review Letters

IS - 12

M1 - 122002

ER -

Measurement of the parity-violating asymmetry in inclusive electroproduction of π ^- Near the Δ0 resonance

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