Coincidence πo electroproduction experiments in the first resonance region at momentum transfers of 0.3, 0.45, 0.60, 0.76 (GeV/c)2

Siddle, Ronald; Dickinson, B.; Ibbotson, M.; Lawson, Richard; Montgomery, H. E.; Nuthakki, V.P.R.; Tümer, O. T.; Shuttleworth, W. James; Sofair, A.; Hellings, R.D.; Allison, J.; Clegg, A.B.; Foster, F.; Hughes, G.; Kummer, P.S.; Fannon, J.

doi:10.1016/0550-3213(71)90134-9

Cited by 84 publications

(23 citation statements)

References 11 publications

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“…7.Within the errors it agrees with older data at slightly larger Q 2 [31,32]. Although a little lower, it is also compatible with the Sato/Lee, DMT2001 2 with statistical and systematical errors as extracted from this experiment using the MAID2003 re-fit (full cross), compared to measurements.…”

Section: Discussionsupporting

confidence: 77%

“…the result of [27], and S1+/M1+ = −10%, S0+/M1+ = −14% (dottet), which would bring [27] in accordance with other measurements [16]. 2 with statistical and systematical errors as extracted from this experiment using the MAID2003 re-fit (full cross); compared to measurements from DESY [31] (open square), NINA [32] (open circles), where only statistical errors are indicated. The curves show model calculations MAID2003 [18] (solid), DMT2001 [12] (dashed) and Sato/Lee [13] (dashed dotted).…”

Section: Discussionmentioning

confidence: 99%

“…Although a little lower, it is also compatible with the Sato/Lee, DMT2001 2 with statistical and systematical errors as extracted from this experiment using the MAID2003 re-fit (full cross), compared to measurements. Data where only statistical errors are given: DESY [31] (open square), NINA [32] (open circles), Bonn synchrotron [40] (open triangle tip up) and ELSA [27] (full triangle tip down). Data, where statistical and systematical errors are given: ELSA [28] (full circle, to improve the presentation shiftet from Q 2 =0.201 (GeV/c) 2 to Q 2 =0.221 (GeV/c) 2 ), MAMI [24] (open diamond), CLAS [21] (full triangles) and BATES [29,30] (full square).…”

Section: Discussionmentioning

confidence: 99%

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Measurement of the LT-asymmetry in πelectroproduction at the energy of the Δ(1232)-resonance

et al. 2006

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Abstract. The reaction p(e, e ′ p)π 0 has been studied at Q 2 =0.2 (GeV/c) 2 in the region of W=1232 MeV. From measurements left and right of q, cross section asymmetries ρLT have been obtained in forward kinematics ρLT (θ cm π 0 = 20• ) = (−11.68 ± 2.36stat ± 2.36sys) and backward kinematics ρLT (θ 2 required to bring also the result of Kalleicher et al. in accordance with the rest of the data is almost excluded.

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Section: Discussionsupporting

confidence: 77%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Measurement of the LT-asymmetry in πelectroproduction at the energy of the Δ(1232)-resonance

et al. 2006

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“…The three polarisation components measured in parallel kinematics are model independently related by angular [38] in comparison to unpolarised measurements [18,19,26,28,29,44,45] at low Q 2 . The curves show model calculations MAID2003 [23] (solid), DMT2001 [25] (dashed) and Sato/Lee [22] (dashed dotted).…”

Section: Double Polarisation Experiments: Recoil Proton Polarimetrymentioning

confidence: 99%

Photo- and electro-excitation of the Δ-resonance at MAMI

Schmieden

2006

Eur. Phys. J. A

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Abstract. Over the last decade accurate experiments at MAMI played an essential role to improve our understanding of the nucleon to ∆(1232) transition. Originally to a large extent motivated through intraquark hyperfine interactions anticipated in QCD-inspired quark models they showed that pionic degrees of freedom are essential. The meson cloud is mainly responsible for the observed quadrupole excitation strength and affects the magnetic dipole transition strength as well.

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“…The experimental value at the photon point is taken from [13]. For virtual photons, the values denoted by • are determined from the |M 1+ | amplitude for the process γp → pπ 0 [14] assuming the dominance of the T = 3/2 amplitude, the values denoted by • are computed from G * M [15,18].…”

Section: (10)mentioning

confidence: 99%