Analysis of recent $ \eta$ photoproduction data
نویسندگان
چکیده
منابع مشابه
The ηNN Coupling in Eta Photoproduction
Low-energy eta photoproduction on the nucleon is studied in an effective Lagrangian approach that contains Born terms, vector meson and nucleon resonance contributions. The resonance sector includes the S11(1535), P11(1440) and D13(1520) states whose couplings are fixed by independent electromagnetic and hadronic data. The available (γ, η) data are employed to discuss the difference between pse...
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A partial-wave analysis of single-pion photoproduction data has been completed. This study extends from threshold to 2 GeV in the laboratory photon energy, focusing mainly on the influence of new measurements and modeldependence in the choice of parameterization employed above the two-pion threshold. Results are used to evaluate sum rules and estimate resonance photo-decay amplitudes. These are...
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The isobar models η-MAID and η-MAID have been used to analyze new data on quasifree η photoproduction on the deuteron from Bonn and recent η data on the proton from Jlab. In η photoproduction on the neutron a bump around W = 1700 MeV was observed which could possibly arise from a narrow P11 state that is discussed as a nonstrange member of the Θ antidecuplett. In η photoproduction on the proton...
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We compare results for the D13(1520) photon-decay amplitudes determined in analyses of etaand pion-photoproduction data. The ratio of helicity amplitudes (A3/2/A1/2), determined from eta-photoproduction data, is quite different from that determined in previous analyses of pion-photoproduction data. We consider how strongly the existing pion-photoproduction data constrain both this ratio and the...
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Recent results for inclusive jet cross sections, dijet cross sections and dijet angular distributions are compared with NLO perturbative QCD calculations. The observation of isolated high PT photons (prompt photons) is also reported. INTRODUCTION Collisions of 27.5 GeV positrons with 820 GeV protons at HERA are studied using the ZEUS detector. The processes of interest here are those where an a...
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ژورنال
عنوان ژورنال: The European Physical Journal A
سال: 2010
ISSN: 1434-6001,1434-601X
DOI: 10.1140/epja/i2010-11049-2