<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mi>Q</mml:mi><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msup></mml:mrow></mml:math>dependence of the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mi>S</mml:mi><mml:mrow><mml:mn>11</mml:mn></mml:mrow></mml:msub><mml:mo stretchy="false">(</mml:mo><mml:mn>1535</mml:mn><mml:mo stretchy="false">)</mml:mo></mml:mrow></mml:math>photocoupling and evidence for a<m

Denizli, H.; Muêller, J.; Dytman, S.; Leber, Michelle; Levine, R. D.; Miles, J.; Kim, K. Y.; Adams, G. S.; Amaryan, M. J.; Ambrozewicz, P.; Anghinolfi, M.; Asavapibhop, B.; Asryan, G.; Avakian, H.; Bagdasaryan, H.; Baillie, N.; Ball, J.; Baltzell, N. A.; Barrow, S.; Batourine, V.; Battaglieri, M.; Beard, K.; Bedlinskiy, I.; Bektasoglu, M.; Bellis, M.; Benmouna, N.; Bianchi, N.; Biselli, A. S.; Bonner, B. E.; Bouchigny, S.; Boiarinov, S.; Bradford, R.; Branford, D.; Briscoe, W. J.; Brooks, W. K.; Bültmann, S.; Burkert, Volker; Butuceanu, C.; Calarco, J. R.; Careccia, S. L.; Carman, D. S.; Cetina, C.; Chen, S.; Cole, P. L.; Coleman, Alan; Collins, P.; Coltharp, P.; Cords, D.; Corvisiero, P.; Crabb, D.; Credé, V.; Cummings, J. P.; Dashyan, N.; Vita, R. De; Sanctis, E. De; Degtyarenko, P. V.; Dennis, L.; Deur, A.; Dhuga, K. S.; Dickson, R.; Djalali, C.; Dodge, G. E.; Donnelly, J.; Doughty, D.; Dragovitsch, P.; Dugger, M.; Dzyubak, O. P.; Egiyan, H.; Egiyan, K. S.; Fassi, L. El; Elouadrhiri, L.; Empl, A.; Eugenio, P.; Farhi, L.; Fatemi, R.; Fedotov, G.; Feldman, G.; Feuerbach, R. J.; Forest, T. A.; Frolov, V. V.; Funsten, H. O.; Gaff, S. J.; Garçon, M.; Gavalian, G.; Gilfoyle, G. P.; Giovanetti, K. L.; Girard, Pascal; Girod, F. X.; Goetz, J. T.; Gönenç, A.; Gothe, R. W.; Griffioen, K. A.; Guidal, M.; Guillo, M.; Guler, N.; Guo, L. B.; Gyurjyan, V.; Hafidi, K.; Hakobyan, H.; Hakobyan, R.; Hardie, J.; Heddle, D.; Hersman, F. W.; Hicks, K.; Hleiqawi, I.; Holtrop, M.; Hu, J. F.; Hyde‐Wright, C. E.; Ilieva, Y.; Ireland, D. G.; Ишханов, Б. С.; Isupov, E. L.; Ito, M. M.; Jenkins, David; Jo, H. S.; Joo, K.; Juengst, H. G.; Kalantarians, N.; Kelley, J. H.; Kellie, J. D.; Khandaker, M.; Kim, K.; Kim, W.; Klein, A.; Клейн, Ф.; Klusman, M.; Kossov, M.; Kramer, L. H.; Kubarovsky, V.; Kühn, J.; Kuhn, S. E.; Kuleshov, S.; Lachniet, J.; Laget, J. M.; Langheinrich, J.; Lawrence, D.; Livingston, K.; Lu, H. Y.; Lukashin, K.; MacCormick, M.; Manak, J. J.; Markov, N.; McAleer, S.; McKinnon, B.; McNabb, J. W. C.; Mecking, B. A.; Mestayer, M. D.; Meyer, C. A.; Mibe, T.; Mikhailov, K.; Minehart, R.; Mirazita, M.; Miskimen, R.; Mokeev, V.; Moriya, K.; Morrow, S. A.; Moteabbed, M.; Muccifora, V.; Mutchler, G. S.; Nadel-Turoński, P.; Napolitano, J.; Nasseripour, R.; Nelson, S. O.; Niccolai, S.; Niculescu, G.; Niculescu, I.; Niczyporuk, B. B.; Niroula, M. R.; Niyazov, R. A.; Nozar, M.; O’Rielly, G. V.; Osipenko, M.; Ostrovidov, A. I.; Park, K.; Pasyuk, E.; Paterson, C.; Peterson, G. A.; Philips, S. A.; Pierce, J.; Pivnyuk, N.; Počanić, D.; Pogorelko, O.; Polli, E.; Pozdniakov, S.; Preedom, B. M.; Price, J. W.; Prok, Y.; Protopopescu, D.; Qin, L. M.; Raue, B. A.; Riccardi, G.; Ricco, G.; Ripani, M.; Ritchie, Barry; Ronchetti, F.; Rosner, G.; Rossi, P.; Rowntree, D.; Rubin, P. D.; Sabatié, F.; Sabourov, K.; Salamanca, J.; Salgado, C.; Santoro, J. P.; Sapunenko, V.; Schumacher, R. A.; Serov, V. S.; Shafi, A.; Sharabian, Y. G.; Shaw, J.; Shvedunov, N. V.; Simionatto, S.; Skabelin, A. V.; Smith, E. S.; Smith, L. C.; Sober, D. I.; Sokhan, D.; Spraker, M.; Stavinsky, A.; Stepanyan, S.; Stokes, B. E.; Stoler, P.; Strakovsky, I. I.; Strauch, S.; Taiuti, M.; Taylor, S.; Tedeschi, D. J.; Thoma, U.; Thompson, R.; Tkabladze, A.; Tkachenko, S.; Tur, C.; Ungaro, M.; Vineyard, M. F.; Vlassov, A. V.; Wang, K.; Watts, D. P.; Weinstein, Larry; Weller, H.R.; Weygand, D. P.; Williams, M.; Wolin, E.; Wood, M. H.; Yegneswaran, A.; Yun, J.; Zana, L.; Zhang, J.; Zhao, B.; Zhao, Z. W.

doi:10.1103/physrevc.76.015204

Cited by 92 publications

(57 citation statements)

References 44 publications

(48 reference statements)

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“…We calculated only the positive isospin case (I z ¼ þ1=2), corresponding to the excitation reaction from the proton, where the data at finite Q 2 for the helicity amplitudes is available [7][8][9][10][11][12][13]. We did not consider the neutron case (I z ¼ À1=2), since there is data only for Q 2 ¼ 0, and our model is valid only for Q 2 > 2:3 GeV 2 .…”

Section: Resultsmentioning

confidence: 99%

“…We did not consider the neutron case (I z ¼ À1=2), since there is data only for Q 2 ¼ 0, and our model is valid only for Q 2 > 2:3 GeV 2 . The data from DESY [10] and from Jefferson Lab [9,[11][12][13] are restricted only to the A 1=2 amplitude, assuming that the amplitude S 1=2 was negligible. That assumption was contradicted by the recent CLAS [7] and MAID [8] analysis.…”

Section: Resultsmentioning

confidence: 99%

“…Precise data for the N ! Nð1535Þ amplitudes is available at present [7][8][9][10][11][12][13][14]. Besides being one of the lightest nucleon resonances, the Nð1535Þ baryon is particularly interesting for several reasons: it is very well isolated in the spin 1=2 and negative parity configuration; it decays strongly to the N channel (with a branching ratio % 50%), allowing a very precise determination of the electromagnetic structure, and providing therefore an extra challenge for theoretical models.…”

Section: Introductionmentioning

confidence: 99%

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Covariant model for theγN→N(1535)transition at high momentum transfer

Ramalho

Peña

2011

Phys. Rev. D

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A relativistic constituent quark model is applied to the N ! Nð1535Þ transition. The Nð1535Þ wave function is determined by extending the covariant spectator quark model, previously developed for the nucleon, to the S 11 resonance. The model allows us to calculate the valence quark contributions to the N ! Nð1535Þ transition form factors. Because of the nucleon and Nð1535Þ structure the model is valid only for Q 2 > 2:3 GeV 2 . The results are compared with the experimental data for the electromagnetic form factors F Ã 1 and F Ã 2 and the helicity amplitudes A 1=2 and S 1=2 , at high Q 2 .

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Covariant model for theγN→N(1535)transition at high momentum transfer

Ramalho

Peña

2011

Phys. Rev. D

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“…,k = k |k| . Since the wave function Φ j(ls) and its argument m 12 are relativistic invariants, the expression for the state vector (7) in a moving reference frame, P + 12 m d |[m d , j(l, s)];P 12 , µ j f , can be obtained by the substitution |[m 12 , j(l, s)]; 12 , j(l, s)];P 12 , µ j f in the r.h.s. of Eq.…”

Section: B Two-particle States and Melosh Transformationsmentioning

confidence: 99%

Transition form factors and helicity amplitudes for electroexcitation of negative and positive parity nucleon resonances in a light-front quark model

et al. 2019

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A workable basis of quark configurations s 3 , s 2 p and sp 2 at light front has been constructed to describe the high-Q 2 behavior of transition form factors and helicity amplitudes in the electroproduction of the lightest nucleon resonances, N 1/2 − (1535) and N 1/2 + (1440). High-quality data of the CLAS Collaboration are described in the framework of a model which takes into account mixing of the quark configurations and the hadron-molecular states. The model allows for a rough estimate of the quark core weight in the wave function of the resonance in a comparison with high momentum transfer data on resonance electroproduction. I. INTRODUCTIONNew data on the electroproduction of low-lying nucleon resonances (J P = 1 2 ± , 3 2 ± , 5 2 ± ) at large momentum transfer provide important complementary information on the inner structure of hadron resonances [1]- [13]. These data provide evidence in support of the dominance of quark degrees of freedom in the process of electroproduction and allow to evaluate the weight of the quark component in the resonance wave function. The resonance spectrum is remarkably consistent with the quark-model predictions [14], but the traditional quark model refers only to the rest frame, whereas processes at large momentum transfer require a description of baryons in the moving frame. There are many theoretical approaches to the problem which start from the first principles [15]-[35], e.g., light-front QCD [15], lattice QCD [16], quark models [17]-[20], light-cone sum rules [21], approaches based on solution of Dyson-Schwinger and Bethe-Salpeter equations [22, 23], approaches based on chiral dynamics [24], AdS/QCD [26]-[35].The LF wave functions have the advantage that they undergo interaction-independent transformations under the action of "front boosts". In the front form of dynamics [36] the generators of front boosts are kinematical and the front boosts itself are elements of a kinematical subgroup of the Poincaré group. The price to pay is that the space rotations are not kinematical transformations. The light front t−z = 0 is not invariant under space rotations except for rotations about the z axis. Thus the generators of rotations should depend on the interaction given at the light front. By contrast, in the instant form of dynamics the "instant" (t = 0), or canonical, boosts depend on the interaction and do not generate a kinematical subgroup. Then the rotation group (together with the spatial translation group) can be considered as a kinematical subgroup of the Poincaré group.In spite of difficulties associated with the rotational symmetry, the LF approach to the description of the transition form factors implies the construction of a good basis of quark configurations possessing definite values of the orbital (L) and total (J = L + S) angular momenta and satisfying the Pauli exclusion principle. The challenge has been to modify the standard shell-model (normally harmonic oscillator) basis to describe the LF three-quark configurations with simple properties about the relativi...

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“…15 and in Fig. 17, respectively, as representative examples [60,61,63] of a wide program at JLab [64,65,66,67,68,69,70,71,72]. For these three states advanced relativistic quark model calculations [73] and QCD calculations from DSE [74] and Light Cone sum rule [75] are available, for the first time employing QCD-based modeling of the excitation of the quark core.…”

Section: Structure Of Excited Nucleonsmentioning

confidence: 99%

N $$^*$$ ∗ Experiments and Their Impact on Strong QCD Physics

Burkert

2018

Few-Body Syst

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I give an overview on experimental studies of the spectrum and the structure of the excited states of the nucleon and what we can learn about their internal structure. One focus is on the efforts to obtain a more complete picture of the light-quark baryon excitation spectrum employing electromagnetic beams that will allow us to draw some conclusions on the symmetries underlying the spectrum. For the higher mass excitations, the full employment of coupled channel approaches is essential when searching for new excited states in the large amounts of data already accumulated in different channels involving a variety of polarization observables. The other focus is on the study of transition form factors and helicity amplitudes and their dependences on Q 2 , especially on some of the more prominent resonances, especially ∆(1232) 3 2 + , N (1440) 1 2 + , and negative parity states N (1535) 1 2 − , and N (1675) 5 2 − . These were obtained in pion and eta electroproduction experiments off proton targets and have already led to further insights in the active degrees-of-freedom as a function of the distance scale involved.

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Q2dependence of theS11(1535)photocoupling and evidence for a

Cited by 92 publications

References 44 publications

Covariant model for theγN→N(1535)transition at high momentum transfer

Covariant model for theγN→N(1535)transition at high momentum transfer

Transition form factors and helicity amplitudes for electroexcitation of negative and positive parity nucleon resonances in a light-front quark model

N $$^*$$ ∗ Experiments and Their Impact on Strong QCD Physics

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