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25 April 2024

» pubmed » pmid15698166

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Investigation of the conjectured nucleon deformation at low momentum transfer
N F Sparveris ; R Alarcon ; A M Bernstein ; W Bertozzi ; T Botto ; P Bourgeois ; J Calarco ; F Casagrande ; M O Distler ; K Dow ; M Farkondeh ; S Georgakopoulos ; S Gilad ; R Hicks ; M Holtrop ; A Hotta ; X Jiang ; A Karabarbounis ; J Kirkpatrick ; S Kowalski ; R Milner ; R Miskimen ; I Nakagawa ; C N Papanicolas ; A J Sarty ; Y Sato ; S Sirca ; J Shaw ; E Six ; S Stave ; E Stiliaris ; T Tamae ; G Tsentalovich ; C Tschalaer ; W Turchinetz ; Z-L Zhou ; T Zwart ;
Date:	21 Jan 2005
Journal:	Phys Rev Lett, 94 (2), 022003
Abstract:	We report new precise H(e,e(’)p)pi(0) measurements at the Delta(1232) resonance at Q(2)=0.127 (GeV/c)(2) obtained at the MIT-Bates out-of-plane scattering facility which are particularly sensitive to the transverse electric amplitude (E2) of the gamma(*)N-->Delta transition. The new data have been analyzed together with those of earlier measurements to yield precise quadrupole to dipole amplitude ratios: Re(E(3/2)(1+)/M(3/2)(1+))=(-2.3+/-0.3(stat+syst)+/-0.6(model))% and Re(S(3/2)(1+)/M(3/2)(1+))=(-6.1+/-0.2(stat+syst)+/-0.5(model))% for M(3/2)(1+)=(41.4+/-0.3(stat+syst)+/-0.4(model))(10(-3)/m(pi(+))). The derived amplitudes give credence to the conjecture of deformation in hadrons favoring, at low Q2, the dominance of mesonic effects.
Source:	PubMed, pmid15698166
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