Proton-η′ interactions at threshold

Anisovich, A. V.; Burkert, Volker; Dugger, M.; Klempt, E.; Nikonov, V. A.; Ritchie, B. G.; Sarantsev, A.; Thoma, U.

doi:10.1016/j.physletb.2018.06.034

Cited by 30 publications

(37 citation statements)

References 33 publications

(59 reference statements)

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“…The observed behaviour can be explained by a narrow resonance close to threshold. This is further supported by results from the Bonn-Gatchina partial wave analysis group which show that including a narrow resonance (D 13 (1900)) with a mass of M η p = 1900 ± 1 MeV and a width of Γ η p < 3 MeV close to threshold much more accuratly describes the experimental data [3], see figure 2. EtaMAID can describe the observed behaviour as well us- ing a narrow S 11 (1900) resonance [2].…”

Section: Introductionsupporting

confidence: 60%

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η’ beam asymmetry at threshold using the BGO-OD experiment

et al. 2020

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The unexpected nodal structure of the beam asymmetry recently reported by the GRAAL collaboration in η′ photoproduction very close to threshold could be explained by a previously unobserved narrow resonance. The BGO-OD experiment is ideally suited to verify this measurement via the detection of forward going charged particles which in the threshold region of interest allows the identification of the reaction γp → η′ p solely based on the proton going in the forward direction. This yields unprecedented statistics if, in the missing mass analysis of the η′ meson, the background can be sufficiently well controlled. Preliminary results using a linearly polarised photon beam are shown. The reaction γp → η′ p was identified in the BGO forward spectrometer, with simulated data used to seperate signal and background.

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Section: Introductionsupporting

confidence: 60%

“…Partial wave analysis results from the Bonn-Gatchina partial wave analysis group. The red dotted lines show the fits with a narrow resonance close to the η threshold included whereas the solid black lines show the same fits without the resonance included[3].…”

mentioning

confidence: 99%

η’ beam asymmetry at threshold using the BGO-OD experiment

et al. 2020

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“…A comparison of the multipoles shows that the new polarization data helps to reach the goal of Figure 8. The double polarization observable G is shown for the pη final state (black points) together with different PWA solutions (latest fit of BnGa (black line) [40], BnGa2011-02 (red line) [42], ηMAID2018 (green line) [48], SAID-GE09 (dark blue dotted) [49], JüBo-2015 (light blue dashed line) [50] and JüBo-2015-3 (light blue solid line) [51]). Taken from [14].…”

Section: Discussionmentioning

confidence: 99%

“…The data are compared to data from the CLAS collaboration (green squares) [5], from the GRAAL collaboration (black triangles) [39] and from the LEPS collaboration (red points) [7]. In addition the data are compared to the latest PWA solutions of BnGa [40] and JüBo-2017 [16]. The systematic error is represented by the gray area.…”

Section: Double Meson Photoproduction: γPmentioning

confidence: 99%

Recent results from the CBELSA/TAPS experiment at ELSA

Afzal

2020

EPJ Web Conf.

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In order to gain a better understanding of the dynamics inside the nucleon and of the non-perturbative regime of QCD, the nucleon excitation spectra and the properties of nucleon resonances are investigated. An essential experimental tool to achieve this goal is the study of different photoproduction reactions. Partial wave analyses are performed in order to obtain information about the contributing resonances. A complete experiment is needed to extract the underlying amplitudes unambiguously, which requires the measurement of carefully chosen single and double polarization observables in addition to the unpolarized cross section. The CBELSA/TAPS experiment in Bonn offers the possibility to measure several polarization observables using a linearly or circularly polarized photon beam and with a longitudinally or transversely polarized target. This contribution gives an overview of recently measured polarization observables in different final states. The impact of the new data is discussed.

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“…Our current knowledge of most of the N * 's is mainly coming from the production reactions of πN , ηN , KΛ, and KΣ channels. In recent years, the photoproductions of vector mesons, η ′ meson, and KY * (Y = Λ, Σ) have also been extensively investigated both experimentally and theoretically towards getting a better understanding of N * 's [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Photoproduction γp→K+Λ(1520) in an effective Lagrangian approach

et al. 2021

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In our previous work [Phys. Rev. C 101, 014003 (2020)], the photoproduction reaction γp → K * + Λ has been investigated within an effective Lagrangian approach. There, the reaction amplitudes were constructed by including the t-channel K, K * , and κ exchanges, the u-channel Λ, Σ, and Σ * exchanges, the s-channel N , N (2000)5/2 + , and N (2060)5/2 − exchanges, and the interaction current. It has been shown that the data on both the differential cross sections and the spin density matrix elements were simultaneously and satisfactorily described. In this paper, we study the photoproduction reaction γn → K * 0 Λ based on the same reaction mechanism as that of γp → K * + Λ with the purpose of getting a unified description of the data for both γp → K * + Λ and γn → K * 0 Λ within a same model. All hadronic coupling constants, form factor cutoffs, and the resonance masses and widths in the present calculations remain the same as in our previous work for γp → K * + Λ. The available differential cross-section data for γn → K * 0 Λ are well reproduced. Further analysis shows that the cross sections of γn → K * 0 Λ are dominated by the contributions of the t-channel K exchange, while the s-channel N (2000)5/2 + and N (2060)5/2 − exchanges provide considerable contributions as well.

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Proton-η′ interactions at threshold

Cited by 30 publications

References 33 publications

η’ beam asymmetry at threshold using the BGO-OD experiment

η’ beam asymmetry at threshold using the BGO-OD experiment

Recent results from the CBELSA/TAPS experiment at ELSA

Photoproduction γp→K+Λ(1520) in an effective Lagrangian approach

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