New Measurement of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi mathvariant="italic">Σ</mml:mi></mml:math>Beam Asymmetry for<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi mathvariant="italic">η</mml:mi></mml:math>Meson Photoproduction on the Proton

Ajaka, J.; Anghinolfi, M.; Bellini, V.; Berrier, G.; Bocquet, J. P.; Breuer, M.; Calvat, P.; Capogni, M.; Casano, L.; Castoldi, M.; Ciciani, L.; Corvisiero, P.; D’Angelo, A.; Didélez, J. P.; Salvo, R. Di; Djalali, C.; Duval, M.; Frascaria, R.; Gervino, G.; Ghio, F.; Girard, Pascal; Girolami, B.; Guinault, E.; Hoffmann-Rothe, P.; Hourany, E.; Kilvington, I.; Kouznetsov, V.; Lapik, A.; Sandri, P. Levi; Moricciani, D.; Morlet, M.; Nedorezov, V.; Nicoletti, L.; Perrin, C.; Rebreyend, D.; Renard, F.; Ripani, M.; Rosier, L.; Rossi, P.; Roudot, F.; Russew, T.; Sanzone, M.; Schaerf, C.; Sperduto, M. L.; Sudov, A.S.; Taiuti, M.; Turinge, A.; Wiele, J. Van de; Zucchiatti, A.

doi:10.1103/physrevlett.81.1797

Cited by 130 publications

(67 citation statements)

References 29 publications

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“…[13] for the photon asymmetry. This observable has recently been measured at GRAAL [12] from threshold up to 1050 MeV. At the lower energies, the good agreement between the data and the isobar model illustrates the importance of the D 13 (1520) resonance.…”

Section: Resultssupporting

confidence: 61%

“…Recently, polarization data for the target and photon asymmetries in eta photoproduction were measured at ELSA [10] and GRAAL [12], respectively, for the first time. Combining these data with the unpolarized cross sections from MAMI, we have performed an almost model-independent multipole analysis of the l = 0 and 2 eta photoproduction multipoles at threshold.…”

Section: Introductionmentioning

confidence: 99%

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Analysis of resonance multipoles from polarization observables inηphotoproduction

et al. 1999

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A combined analysis of new eta photoproduction data for total and differential cross sections, target asymmetry and photon asymmetry is presented. Using a few reasonable assumptions we perform the first model-independent analysis of the E0+, E2− and M2− eta photoproduction multipoles. Making use of the well-known A 3/2 helicity amplitude of the D13(1520) state we extract its branching ratio to the ηN channel, ΓηN /Γ = (0.08 ± 0.01)%. At higher energies, we show that the photon asymmetry is extremely sensitive to small multipoles that are excited by photons in the helicity 3/2 state. The new GRAAL photon asymmetry data at higher energy show a clear signal of the F15(1680) excitation which permits extracting an F15(1680) → ηN branching ratio of (0.15 +0.35−0.10 )%.

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Section: Resultssupporting

confidence: 61%

Section: Introductionmentioning

confidence: 99%

Analysis of resonance multipoles from polarization observables inηphotoproduction

et al. 1999

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“…The resulting set of parameters listed in Table 1 [13] was obtained by adjusting the model containing all eleven resonances and the background to the low energy data (K 0 < 1.1 GeV) presented in Ref. [14,15,16,17] as well as to the old experimental results for K 0 > 1.2 GeV obtained in [18,19].…”

Section: Discussion Of the Resultsmentioning

confidence: 99%

Photoproduction of $\eta$ -mesons on protons in the resonance region: The background problem and the third S 11-resonance

Tryasuchev

2004

Eur. Phys. J. A

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Photoproduction of η mesons on protons in the resonance region: The background problem and the third S 11 resonance. V.A. TryasuchevFebruary 28, 2018 AbstractWe have constructed an isobar model for the η-photoproduction on the proton in the energy region up to the photon lab energy K0 = 3 GeV. The data base involved into the fitting procedure includes precise results for the cross section and for the T -asymmetry of the process γp → ηp near threshold obtained at MAMI and ELSA as well as recent results for the Σ-asymmetry and for the angular distribution measured at higher energies in Grenoble and also more recent measurements performed at JLab for the photon energies up to 2 GeV. The model includes twelve nucleon resonances: S11(1535), S11(1650), S11(1825), P11(1440), P13(1720), D13(1520), D15(1675), F15(1680), F17(1990), G17(2190), G19(2250), H19(2220), and the background consisting of the nucleon pole term and the vector meson exchange in the t-channel. To explain the observed energy dependence of the integrated cross section, two s-wave resonances, S11(1650) and S11(1825), have to be taken into account along with the dominating S11(1535). The integrated cross section as well as the angular distribution and Σ asymmetry predicted by the model are in good agreement with the data. Above the photon energy K0 = 2 GeV, the calculated cross section exhibits an appreciable dependence on the ρ-and ω-meson contribution, whose coupling with nucleons is not well defined. Several versions of extending the model to higher energies are considered.

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“…Other resonances, with a small branching fraction to ηN, can be identified by exploiting the interference with the dominant E 0þ amplitude in single-and double-spin observables. The beam asymmetry Σ, measured with a linearly polarized photon beam [11,12], and the transversely polarized target asymmetry T [13] are particularly sensitive to an interference of s-and d-wave amplitudes. A model independent analysis in the threshold region allowed for the determination of parameters of the N ⋆ ð1520Þ3=2…”

mentioning

confidence: 99%

Measurement of the Transverse Target and Beam-Target Asymmetries inηMeson Photoproduction at MAMI

Akondi¹,

Annand²,

Arends³

et al. 2014

Phys. Rev. Lett.

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We present new data for the transverse target asymmetry T and the very first data for the beam-target asymmetry F in theγp → ηp reaction up to a center-of-mass energy of W ¼ 1.9 GeV. The data were obtained with the Crystal-Ball/TAPS detector setup at the Glasgow tagged photon facility of the Mainz Microtron MAMI. All existing model predictions fail to reproduce the new data indicating a significant impact on our understanding of the underlying dynamics of η meson photoproduction. The peculiar nodal structure observed in existing T data close to threshold is not confirmed.

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New Measurement ofΣBeam Asymmetry forηMeson Photoproduction on the Proton

Cited by 130 publications

References 29 publications

Analysis of resonance multipoles from polarization observables inηphotoproduction

Analysis of resonance multipoles from polarization observables inηphotoproduction

Photoproduction of $\eta$ -mesons on protons in the resonance region: The background problem and the third S 11-resonance

Measurement of the Transverse Target and Beam-Target Asymmetries inηMeson Photoproduction at MAMI

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