Investigation of the conjectured nucleon deformation at low momentum transfer

N. F. Sparveris; Ricardo 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. Širca; J. Shaw; E. Six; S. Stave; E. Stiliaris; T. Tamae; G. Tsentalovich; C. Tschalaer; W. Turchinetz; Z. L. Zhou; T. Zwart

doi:10.1103/PhysRevLett.94.022003

Investigation of the conjectured nucleon deformation at low momentum transfer

N. F. Sparveris, Ricardo 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. KowalskiR. Milner, R. Miskimen, I. Nakagawa, C. N. Papanicolas, A. J. Sarty, Y. Sato, S. Širca, J. Shaw, E. Six, S. Stave, E. Stiliaris, T. Tamae, G. Tsentalovich, C. Tschalaer, W. Turchinetz, Z. L. Zhou, T. Zwart

Physics

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Abstract

We report new precise H(e, e′p)-π0 measurements at the Δ(1232) resonance at Q² = 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 γ*N → Δ transition. The new data have been analyzed together with those of earlier measurements to yield precise quadrupole to dipole amplitude ratios: Re(E ₁₊^3/2/M₁₊^3/2) = (-2.3 ± 0.3^stat+syst ± 0.6^model)% and Re(S ₁₊^3/2/M₁₊^3/2) = (-6.1 ± 0.2^stat+syst ± 0.5^model)% for M₁₊ ^3/2 = (41.4 ± 0.3^stat+syst ± 0.4 ^model)(10_-3/m_π+). The derived amplitudes give credence to the conjecture of deformation in hadrons favoring, at low Q², the dominance of mesonic effects.

Original language	English (US)
Article number	022003
Journal	Physical Review Letters
Volume	94
Issue number	2
DOIs	https://doi.org/10.1103/PhysRevLett.94.022003
State	Published - Jan 21 2005

ASJC Scopus subject areas

Physics and Astronomy(all)

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10.1103/PhysRevLett.94.022003

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Sparveris, N. F., Alarcon, R., Bernstein, A. M., Bertozzi, W., Botto, T., Bourgeois, P., Calarco, J., Casagrande, F., Distler, M. O., Dow, K., Farkondeh, M., Georgakopoulos, S., Gilad, S., Hicks, R., Holtrop, M., Hotta, A., Jiang, X., Karabarbounis, A., Kirkpatrick, J., ... Zwart, T. (2005). Investigation of the conjectured nucleon deformation at low momentum transfer. Physical Review Letters, 94(2), Article 022003. https://doi.org/10.1103/PhysRevLett.94.022003

Sparveris, NF, Alarcon, R, Bernstein, AM, Bertozzi, W, Botto, T, Bourgeois, P, Calarco, J, Casagrande, F, Distler, MO, Dow, K, Farkondeh, M, Georgakopoulos, S, Gilad, S, Hicks, R, Holtrop, M, Hotta, A, Jiang, X, Karabarbounis, A, Kirkpatrick, J, Kowalski, S, Milner, R, Miskimen, R, Nakagawa, I, Papanicolas, CN, Sarty, AJ, Sato, Y, Širca, S, Shaw, J, Six, E, Stave, S, Stiliaris, E, Tamae, T, Tsentalovich, G, Tschalaer, C, Turchinetz, W, Zhou, ZL & Zwart, T 2005, 'Investigation of the conjectured nucleon deformation at low momentum transfer', Physical Review Letters, vol. 94, no. 2, 022003. https://doi.org/10.1103/PhysRevLett.94.022003

@article{ad3a68a94eb24fad8cc7bf40365e9b66,

title = "Investigation of the conjectured nucleon deformation at low momentum transfer",

abstract = "We report new precise H(e, e′p)-π0 measurements at the Δ(1232) resonance at Q2 = 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 γ*N → Δ transition. The new data have been analyzed together with those of earlier measurements to yield precise quadrupole to dipole amplitude ratios: Re(E 1+3/2/M1+3/2) = (-2.3 ± 0.3stat+syst ± 0.6model)% and Re(S 1+3/2/M1+3/2) = (-6.1 ± 0.2stat+syst ± 0.5model)% for M1+ 3/2 = (41.4 ± 0.3stat+syst ± 0.4 model)(10-3/mπ+). The derived amplitudes give credence to the conjecture of deformation in hadrons favoring, at low Q2, the dominance of mesonic effects.",

author = "Sparveris, {N. F.} and Ricardo Alarcon and Bernstein, {A. M.} and W. Bertozzi and T. Botto and P. Bourgeois and J. Calarco and F. Casagrande and Distler, {M. O.} and K. Dow and M. Farkondeh and S. Georgakopoulos and S. Gilad and R. Hicks and M. Holtrop and A. Hotta and X. Jiang and A. Karabarbounis and J. Kirkpatrick and S. Kowalski and R. Milner and R. Miskimen and I. Nakagawa and Papanicolas, {C. N.} and Sarty, {A. J.} and Y. Sato and S. {\v S}irca and J. Shaw and E. Six and S. Stave and E. Stiliaris and T. Tamae and G. Tsentalovich and C. Tschalaer and W. Turchinetz and Zhou, {Z. L.} and T. Zwart",

year = "2005",

month = jan,

day = "21",

doi = "10.1103/PhysRevLett.94.022003",

language = "English (US)",

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T1 - Investigation of the conjectured nucleon deformation at low momentum transfer

AU - Sparveris, N. F.

AU - Alarcon, Ricardo

AU - Bernstein, A. M.

AU - Bertozzi, W.

AU - Botto, T.

AU - Bourgeois, P.

AU - Calarco, J.

AU - Casagrande, F.

AU - Distler, M. O.

AU - Dow, K.

AU - Farkondeh, M.

AU - Georgakopoulos, S.

AU - Gilad, S.

AU - Hicks, R.

AU - Holtrop, M.

AU - Hotta, A.

AU - Jiang, X.

AU - Karabarbounis, A.

AU - Kirkpatrick, J.

AU - Kowalski, S.

AU - Milner, R.

AU - Miskimen, R.

AU - Nakagawa, I.

AU - Papanicolas, C. N.

AU - Sarty, A. J.

AU - Sato, Y.

AU - Širca, S.

AU - Shaw, J.

AU - Six, E.

AU - Stave, S.

AU - Stiliaris, E.

AU - Tamae, T.

AU - Tsentalovich, G.

AU - Tschalaer, C.

AU - Turchinetz, W.

AU - Zhou, Z. L.

AU - Zwart, T.

PY - 2005/1/21

Y1 - 2005/1/21

N2 - We report new precise H(e, e′p)-π0 measurements at the Δ(1232) resonance at Q2 = 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 γ*N → Δ transition. The new data have been analyzed together with those of earlier measurements to yield precise quadrupole to dipole amplitude ratios: Re(E 1+3/2/M1+3/2) = (-2.3 ± 0.3stat+syst ± 0.6model)% and Re(S 1+3/2/M1+3/2) = (-6.1 ± 0.2stat+syst ± 0.5model)% for M1+ 3/2 = (41.4 ± 0.3stat+syst ± 0.4 model)(10-3/mπ+). The derived amplitudes give credence to the conjecture of deformation in hadrons favoring, at low Q2, the dominance of mesonic effects.

AB - We report new precise H(e, e′p)-π0 measurements at the Δ(1232) resonance at Q2 = 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 γ*N → Δ transition. The new data have been analyzed together with those of earlier measurements to yield precise quadrupole to dipole amplitude ratios: Re(E 1+3/2/M1+3/2) = (-2.3 ± 0.3stat+syst ± 0.6model)% and Re(S 1+3/2/M1+3/2) = (-6.1 ± 0.2stat+syst ± 0.5model)% for M1+ 3/2 = (41.4 ± 0.3stat+syst ± 0.4 model)(10-3/mπ+). The derived amplitudes give credence to the conjecture of deformation in hadrons favoring, at low Q2, the dominance of mesonic effects.

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U2 - 10.1103/PhysRevLett.94.022003

DO - 10.1103/PhysRevLett.94.022003

M3 - Article

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SN - 0031-9007

VL - 94

JO - Physical Review Letters

JF - Physical Review Letters

IS - 2

M1 - 022003

ER -

Investigation of the conjectured nucleon deformation at low momentum transfer

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