Low-<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si1.gif" overflow="scroll"><mml:msup><mml:mi>Q</mml:mi><mml:mn>2</mml:mn></mml:msup></mml:math> scaling behavior of the form-factor ratios for the <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si2.gif" overflow="scroll"><mml:mi>N</mml:mi><mml:mi mathvariant="normal">Δ</mml:mi><mml:mo stretchy="false">(</mml:mo><mml:mn>1232</mml:mn><mml:mo stretchy="false">)</mml:mo></mml:math>-transition

Vereshkov, G. M.; Volchanskiy, N.

doi:10.1016/j.physletb.2009.11.066

Cited by 4 publications

(10 citation statements)

References 40 publications

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“…Such low-Q 2 scaling of the FF ratios was seen in the cases of the nucleon elastic FFs [22] and the FFs for the transition N → (1232) [9]. However, the quality and Q 2 span of the available experimental data on the FFs of the NN * (1680) transition are completely insufficient to draw any definite conclusion concerning the regime of Q 2 evolution of the FF ratios, although the hypothesis of the scaling behavior of the ratios does not contradict the experimental data.…”

Section: Helicity Amplitudes and Form Factorsmentioning

confidence: 71%

“…Three terms of the minimally local point-and gauge-invariant Lagrangian turn out to be defined uniquely and involve different numbers of the field derivatives, which provides us with the classification of the FFs in terms of the differential order of the Lagrangian. In addition, we find that the Lagrangian has much in common with the γ * N (1232) Lagrangian [9] of the same symmetry in its form and properties.…”

Section: Introductionmentioning

confidence: 76%

“…The point-and gauge-invariant Lagrangians were considered in Refs. [9] and [3,16] for the cases of electromagnetic N (1232) interactions and trilinear interactions of pions and nucleons with spin-3 2 ( 5 2 ) resonances, respectively.…”

Section: Lagrangian Of the Electromagnetic N N * (1680) Interactmentioning

confidence: 99%

“…Another attractive property offered by the point-and gaugeinvariant Lagrangian (13) is that it has the same structure as the point-and gauge-invariant Lagrangian in the case of the spin- 3 2 RS field [9],…”

Section: Lagrangian Of the Electromagnetic N N * (1680) Interactmentioning

confidence: 99%

“…(19) are the same as in the case of the spin- 3 2 resonance (1232) [see Eqs. (6)-(8) in [9]] up to the change M R → −M R , since the resonance (1232) is of abnormal parity, J P = 3 2 + . It means that the point and gauge invariance produce the universal structure of the electroproduction helicity amplitudes, with the spin of the excited resonance being irrelevant.…”

Section: Helicity Amplitudes and Form Factorsmentioning

confidence: 99%

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Symmetries of higher-spin fields and the electromagneticN→N*(1680)form factors

Vereshkov

Volchanskiy

2010

Phys. Rev. C

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We study the Q 2 evolution of the form factors (FFs) for the nucleon-to-N * (1680) transition in the framework of effective field theory. To this end, the intrinsic symmetries of the spin-5 2 Rarita-Schwinger (RS) fields are analyzed, and a Lagrangian of the electromagnetic NN * (1680) interactions is constructed. The Lagrangian preserves all the intrinsic symmetries of the spin-5 2 field-point and gauge invariance-and does not involve lower-spin components of the reducible RS field. In addition, the symmetries postulate the definitions of the Lagrangian FFs. These FFs are modeled as dispersionlike expansions in a vector-meson-dominance model. A good agreement with the experimental data is achieved.

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Section: Helicity Amplitudes and Form Factorsmentioning

confidence: 71%

Section: Introductionmentioning

confidence: 76%

Section: Lagrangian Of the Electromagnetic N N * (1680) Interactmentioning

confidence: 99%

Section: Lagrangian Of the Electromagnetic N N * (1680) Interactmentioning

confidence: 99%

Section: Helicity Amplitudes and Form Factorsmentioning

confidence: 99%

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Symmetries of higher-spin fields and the electromagneticN→N*(1680)form factors

Vereshkov

Volchanskiy

2010

Phys. Rev. C

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Electroexcitation of nucleon resonances

Aznauryan

Burkert

2012

Progress in Particle and Nuclear Physics

238

385

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We review recent progress in the investigation of the electroexcitation of nucleon resonances, both in experiment and in theory. The most accurate results have been obtained for the electroexcitation amplitudes of the four lowest excited states, which have been measured in a range of Q2 up to 8 and 4.5 GeV2 for the Delta(1232)P33, N(1535)S11 and N(1440)P11, N(1520)D13}, respectively. These results have been confronted with calculations based on lattice QCD, large-Nc relations, perturbative QCD (pQCD), and QCD-inspired models. The amplitudes for the Delta(1232) indicate large pion-cloud contributions at low Q2 and don't show any sign of approaching the pQCD regime for Q2<7 GeV2. Measured for the first time, the electroexcitation amplitudes of the Roper resonance, N(1440)P11, provide strong evidence for this state as a predominantly radial excitation of a three-quark (3q) ground state, with additional non-3-quark contributions needed to describe the low Q2 behavior of the amplitudes. The longitudinal transition amplitude for the N(1535)S11 was determined and has become a challenge for quark models. Explanations may require large meson-cloud contributions or alternative representations of this state. The N(1520)D13 clearly shows the rapid changeover from helicity-3/2 dominance at the real photon point to helicity-1/2 dominance at Q2 > 0.5 GeV2, confirming a long-standing prediction of the constituent quark model. The interpretation of the moments of resonance transition form factors in terms of transition transverse charge distributions in infinite momentum frame is presented.Comment: 70 pages, 46 figures, will appear in Progress in Particle and Nuclear Physics, v.67, p.1, 201

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Electromagnetic transition form factors of baryon resonances

Ramalho,

Peña

2024

Progress in Particle and Nuclear Physics

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Low-Q2 scaling behavior of the form-factor ratios for the NΔ(1232)-transition

Cited by 4 publications

References 40 publications

Symmetries of higher-spin fields and the electromagneticN→N*(1680)form factors

Symmetries of higher-spin fields and the electromagneticN→N*(1680)form factors

Electroexcitation of nucleon resonances

Electromagnetic transition form factors of baryon resonances

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