Measurement of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>e</mml:mi><mml:mi>p</mml:mi><mml:mo>→</mml:mo><mml:msup><mml:mi>e</mml:mi><mml:mo>′</mml:mo></mml:msup><mml:mi>p</mml:mi><mml:msup><mml:mi>π</mml:mi><mml:mo>+</mml:mo></mml:msup><mml:msup><mml:mi>π</mml:mi><mml:mo>−</mml:mo></mml:msup></mml:math>and Baryon Resonance Analysis

Ripani, M.; Burkert, V. D.; Mokeev, V.; Battaglieri, M.; Vita, R. De; Golovach, E.; Taiuti, M.; Adams, G. S.; Anciant, E.; Anghinolfi, M.; Asavapibhop, B.; Audit, G.; Auger, T.; Avakian, H.; Bagdasaryan, H.; Ball, J.; Barrow, S.; Beard, K.; Bektasoglu, M.; Bellis, M.; Berman, B. L.; Bianchi, N.; Biselli, A.; Boiarinov, S.; Bonner, B. E.; Bouchigny, S.; Bradford, R.; Branford, D.; Briscoe, W. J.; Brooks, W. K.; Calarco, J. R.; Carman, D. S.; Carnahan, B.; Cazes, A.; Cetina, C.; Ciciani, L.; Cole, P. L.; Coleman, Alan; Cords, D.; Corvisiero, P.; Crabb, D.; Crannell, H.; Cummings, J. P.; Sanctis, E. De; Degtyarenko, P. V.; Denizli, H.; Dennis, L.; Dharmawardane, K. V.; Djalali, C.; Dodge, G. E.; Doughty, D.; Dragovitsch, P.; Dugger, M.; Dytman, S.; Eckhause, M.; Egiyan, H.; Egiyan, K. S.; Elouadrhiri, L.; Empl, A.; Fatemi, R.; Fedotov, G.; Feldman, G.; Feuerbach, R. J.; Ficenec, J.; Forest, T. A.; Funsten, H. O.; Gaff, S. J.; Gai, M.; Garçon, M.; Gavalian, G.; Gilad, S.; Gilfoyle, G. P.; Giovanetti, K. L.; Girard, Pascal; Griffioen, K. A.; Guidal, M.; Guillo, M.; Guo, L.; Gyurjyan, V.; Hadjidakis, C.; Hardie, J.; Heddle, D.; Heimberg, P.; Hersman, F. W.; Hicks, K.; Hicks, R. S.; Holtrop, M.; Hu, J. F.; Hyde‐Wright, C. E.; Ишханов, Б. С.; Ito, M. M.; Jenkins, D.; Joo, K. S.; Kelley, J. H.; Kellie, J. D.; Khandaker, M.; Kim, K. Y.; Kim, K.; Kim, W.; Klein, A.; Klein, F. J.; Klimenko, A. V.; Klusman, M.; Kossov, M.; Kramer, L.; Kuang, Y.; Kuhn, S. E.; Kühn, J.; Lachniet, J.; Laget, J. M.; Lawrence, D.; Li, J.; Livingston, K.; Longhi, A.; Lukashin, K.; Manak, J. J.; Marchand, Claude; McAleer, S.; McCarthy, J.; McNabb, J. W. C.; Mecking, B. A.; Mestayer, M. D.; Meyer, C. A.; Mikhailov, K.; Minehart, R.; Mirazita, M.; Miskimen, R.; Morand, L.; Morrow, S. A.; Mozer, M. U.; Muccifora, V.; Muêller, J.; Murphy, L. Y.; Mutchler, G. S.; Napolitano, J.; Nasseripour, R.; Nelson, S. O.; Niccolai, S.; Niculescu, G.; Niculescu, I.; Niczyporuk, B. B.; Niyazov, R. A.; Nozar, M.; O’Rielly, G. V.; Opper, A. K.; Osipenko, M.; Park, K.; Pasyuk, E.; Peterson, G. A.; Philips, S. A.; Pivnyuk, N.; Počanić, D.; Pogorelko, O.; Polli, E.; Pozdniakov, S.; Preedom, B. M.; Price, J. W.; Prok, Y.; Protopopescu, D.; Qin, L. M.; Quinn, B.; Raue, B. A.; Riccardi, G.; Ricco, G.; Ritchie, Barry; Ronchetti, F.; Rossi, P.; Rowntree, D.; Rubin, P. D.; Sabatié, F.; Sabourov, K.; Salgado, C.; Santoro, J. P.; Sapunenko, V.; Schumacher, R. A.; Serov, V. S.; Shafi, A.; Sharabian, Y. G.; Shaw, J.; Simionatto, S.; Skabelin, A. V.; Smith, E. S.; Smith, L. C.; Sober, D. I.; Spraker, M.; Stavinsky, A.; Stepanyan, S.; Stoler, P.; Strakovsky, I. I.; Taylor, S.; Tedeschi, D. J.; Thoma, U.; Thompson, R.; Todor, L.; Ungaro, M.; Vineyard, M. F.; Vlassov, A. V.; Wang, K.; Weinstein, L. B.; Weller, H.R.; Weygand, D. P.; Whisnant, C. S.; Wolin, E.; Wood, M. H.; Yegneswaran, A.; Yun, Jaeseok; Zhang, B.; Zhao, J.; Zhou, Zhengfang

doi:10.1103/physrevlett.91.022002

Cited by 117 publications

(108 citation statements)

References 107 publications

(21 reference statements)

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“…One point should be emphasized that our global fits of the π − p → ηn, K 0 Λ reaction data seem to favour a broad width Γ ≃ 400 MeV for N(1720)P 13 , however, this width is much broader than Γ ≃ 120 MeV extracted from the neutral pion photoproduction processes in our previous work [49]. A similar narrow width of N(1720)P 13 was also found by the CLAS Collaboration in the reaction ep → ep ′ π + π − [81]. We will further discuss whether a narrow width state N(1720)P 13 is allowed or not in the π − p → ηn, K 0 Λ reactions later.…”

Section: A Parameterssupporting

confidence: 81%

Combined analysis of theπ−p→K0Λ,ηnreactions in a chiral quark model

et al. 2016

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A combined analysis of the reactions π − p → K 0 Λ and ηn is carried out with a chiral quark model. The data in the center-of-mass (c.m.) energy range from threshold up to W ≃ 1.8 GeV are reasonably described. For π − p → K 0 Λ, it is found that N(1535)S 11 and N(1650)S 11 paly crucial roles near threshold. The N(1650)S 11 resonance contributes to the reaction through configuration mixing with N(1535)S 11 . The constructive interference between N(1535)S 11 and N(1650)S 11 is responsible for the peak structure around threshold in the total cross section. The n-pole, u-and t-channel backgrounds provide significant contributions to the reaction as well. While, for the π − p → ηn process, the "first peak" in the total cross section is dominant by N(1535)S 11 , which has a sizeable destructive interference with N(1650)S 11 . Around P π ≃ 1.0 GeV/c (W ≃ 1.7 GeV), there seems to be a small bump structure in the total cross section, which might be explained by the interference between the u-channel and N(1650)S 11 . The N(1520)D 13 resonance notably affects the angle distributions of the cross sections, although less effects are seen in the total cross section. The role of P-wave state N(1720)P 13 should be further confirmed by future experiments. If N(1720)P 13 has a narrow width of Γ ≃ 120 MeV as found in our previous work by a study of the π 0 photoproduction processes, obvious evidence should be seen in the π − p → K 0 Λ and ηn processes as well.

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Section: A Parameterssupporting

confidence: 81%

Combined analysis of theπ−p→K0Λ,ηnreactions in a chiral quark model

et al. 2016

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“…In addition, cuts were placed to restrict particle tracks to the fiducial volume of the detector, which eliminated inefficient regions at the edges of the CC and DC. The fiducial cuts are standard for CLAS and are described elsewhere [20].…”

Section: B Particle Identificationmentioning

confidence: 99%

“…The combined analysis of the π + π − p photo-and electroproduction data [20] revealed preliminary evidence for the existence of a N (1720)3/2 + state. Its spin-parity, mass, total and partial hadronic decay widths, along with the Q 2 evolution of its γ v pN * electrocouplings, have been obtained from a fit to the CLAS data [18].…”

Section: Introductionmentioning

confidence: 98%

“…The resonance electrocouplings from exclusive π + π − p electroproduction have been extracted in the range of W < 2.0 GeV and Q 2 < 1.5 GeV 2 [20,22]. An extension of the measured π + π − p electroproduction cross sections towards higher photon virtualities is critical for the extraction of resonance electrocouplings at the distance scale where the transition to the dominance of dressed quark degrees of freedom in the N * structure is expected [1,2].…”

Section: Introductionmentioning

confidence: 99%

“…As in our previous studies [20,22], these are obtained by integration of the fivefold differential cross section over different sets of four kinematic variables. The combined analysis of all nine onefold differential cross sections gives access to correlations in the fivefold differential cross sections from the correlations seen in the nine onefold differential cross sections, as they all represent different integrals of the same fivefold differential cross sections.…”

Section: Introductionmentioning

confidence: 99%

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Measurements of ep→e′π+π−p′ cross sections with CLAS at 1.40
Isupov¹,
Burkert²,
Carman³
et al. 2017
Phys. Rev. C
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41
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44
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This paper reports new exclusive cross sections for ep → e π + π − p using the CLAS detector at Jefferson Laboratory. These results are presented for the first time at photon virtualities 2.0 GeV 2 < Q 2 < 5.0 GeV 2 in the center-of-mass energy range 1.4 GeV < W < 2.0 GeV, which covers a large part of the nucleon resonance region. Using a model developed for the phenomenological analysis of electroproduction data, we see strong indications that the relative contributions from the resonant cross sections at W < 1.74 GeV increase with Q 2 . These data considerably extend the kinematic reach of previous measurements. Exclusive ep → e π + π − p cross section measurements are of particular importance for the extraction of resonance electrocouplings in the mass range above 1.6 GeV.

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