Excitation of S11 resonances in pion scattering and pion photoproduction on the proton

Chen, Guan-Yeu; Kamalov, S.S.; Yang, Shin Nan; Drechsel, D.; Tiator, L.

doi:10.1016/s0375-9474(03)01453-2

Cited by 47 publications

(61 citation statements)

References 36 publications

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“…Therefore, all published PWA are consistent with the new S 11 (1846) state seen in photo-production channel [29,32]. We demonstrate that the existence of fourth S 11 state around 2100 Mev is not excluded by any PWA, and is actually favored for the hadronic Dubna-Mainz-Taipei amplitudes [29,30]. We compare the obtained results with the results published in literature, and make a final conclusion on the actual position of partial wave poles.…”

Section: Introductionsupporting

confidence: 78%

“…The exception is the latest DMT analyses [17] where all four poles are detected. The new S 11 pole we have found can be identified with the S 11 (1846) pole seen in photo-production channel by the DMT collaboration [29,32].…”

Section: Discussionsupporting

confidence: 58%

“…We show that N(1535) and N(1650) S 11 resonant states are unambiguously seen in all analyzed PWA data, while the performed pole-search procedure strongly suggest the existence of at least one more pole position in the vicinity of 1800 MeV. Therefore, all published PWA are consistent with the new S 11 (1846) state seen in photo-production channel [29,32]. We demonstrate that the existence of fourth S 11 state around 2100 Mev is not excluded by any PWA, and is actually favored for the hadronic Dubna-Mainz-Taipei amplitudes [29,30].…”

Section: Introductionsupporting

confidence: 72%

“…[30]. However, triggered by their old research of photo-production channels in which they had established the strong probability for the existence of new S-wave resonant state in the vicinity of 1846 MeV [29,32], they have recently repeated the analysis and confirmed the existence of this new state at 1880 MeV [17].…”

Section: Dmt Amplitudesmentioning

confidence: 99%

“…The EBAC collaboration also makes an analytic extrapolation of their amplitudes, and has recently presented a more detailed elaboration of their procedures [27]. Other groups have extracted their pole positions using single-channel techniques such as speed-plot and time delay [28][29][30][31]. Recognizing the importance of a direct analytic extrapolation, Dubna-Mainz-Taipei collaboration has recently performed the full analytic continuation, and in ref.…”

Section: Introductionmentioning

confidence: 99%

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Poles as the only true resonant-state signals extracted from a worldwide collection of partial-wave amplitudes using only one, well controlled pole-extraction method

et al. 2011

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Section: Introductionsupporting

confidence: 78%

Section: Discussionsupporting

confidence: 58%

Section: Introductionsupporting

confidence: 72%

Section: Dmt Amplitudesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Poles as the only true resonant-state signals extracted from a worldwide collection of partial-wave amplitudes using only one, well controlled pole-extraction method

et al. 2011

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Chiral constituent quark model study of the process γp → ηp

He¹,

Saghai²,

Li³

et al. 2008

Nstar 2007

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Within a chiral constituent quark model approach, η-meson production on the proton via electromagnetic and hadron probes are studied. With few parameters, differential crosssection and polarized beam asymmetry for γp → ηp and differential cross section for π − p → ηn processes are calculated and successfully compared with the data in the centerof-mass energy range from threshold up to 2 GeV. The five known resonances S 11 (1535), S 11 (1650), P 13 (1720), D 13 (1520), and F 15 (1680) are found to be dominant in the reaction mechanisms in both channels. Possible roles plaied by new resonances are also investigated and in the photoproduction channel, significant contribution from S 11 -and D 15 -resonances, with masses around 1715 MeV and 2090 MeV, respectively, are deduced. For the so-called missing resonances, no evidence is found within the investigated reactions. The helicity amplitudes and decay widths of N * → πN, ηN are also presented, and found consistent with the PDG values.both differential cross section [2, 3,4,5], and polarized beam asymmetry [5,6]. The situation is very different for the π − p → ηn reaction. Actually, the data come mainly from measurements performed in 70's [7,8,9,10,11,12] and suffer from some inconsistencies [13]. A recent experiment, performed at BNL using the Crystal Ball spectrometer [14], offers a high quality data set, though limited to the close to threshold kinematics. Consequently, a combined data base embodying experimental results for both electromagnetic and strong channels turns out to be highly heterogeneous. In spite of that uncomfortable situation, recent intensive theoretical investigations interpreting both channels within a single approach has proven to be fruitful in revealing various aspects of the relevant reaction mechanisms, as discussed, e.g., in Refs. [1,15].In the photoproduction sector, a significant progress has been performed in recent years within coupled-channels formalisms [16,17,18,19] allowing to investigate a large number of intermediate and/or final meson-baryon (MB) states: γN → M B, with M B ≡ πN, ηN, ρN, σN, π∆, KΛ, KΣ.Those approaches have been reviewed in our recent paper [1]. Also advanced coupled-channels approaches are being developed [15,20,21,22] for the strong channels: πN → M B. However, fewer studies embody both electromagnetic and strong production processes. Moreover, those works are based on the effective Lagrangian approaches (ELA), where meson-baryon degrees of freedom are implemented, (see e.g. Refs. [17,18,23,24]). Investigations based on subnucleonic degrees of freedom, via constituent quark models (CQM) have been successful [1,25,26,27,28,29] in the interpretation of photoproduction data on the proton, namely, γp → πN, ηp, KΛ, and a recent work [30] has considered the π − p → ηn reaction.At the present stage, the ELA and the CQM approaches are complementary. However, the QCDinspired CQM developments deal on the one hand with more fundamental degrees of freedom and on the other hand require a much smaller number of adjustable p...

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Physics at ELSA

Schmieden¹,

Crystal-Barrel²

2008

Nstar 2007

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Abstract. Recent experimental results of the Crystal-Barrel/TAPS collaboration at ELSA are presented. The experiments used a tagged photon beam incident on proton and neutron targets. Multiple photon final states were detected in the hermetically closed Crystal Barrel/TAPS detector setup, enabling the reconstruction of various neutral meson production channels. In addition to cross sections also photon beam asymmetries and, in the K

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Excitation of S11 resonances in pion scattering and pion photoproduction on the proton

Cited by 47 publications

References 36 publications

Poles as the only true resonant-state signals extracted from a worldwide collection of partial-wave amplitudes using only one, well controlled pole-extraction method

Poles as the only true resonant-state signals extracted from a worldwide collection of partial-wave amplitudes using only one, well controlled pole-extraction method

Chiral constituent quark model study of the process γp → ηp

Physics at ELSA

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