Unified Chew-Mandelstam SAID analysis of pion photoproduction data
نویسندگان
چکیده
منابع مشابه
Analysis of Pion Photoproduction Data
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 special features of forward pion photoproduction at high energies are discussed. It is established that the cross section for single pion production can generally be expected to have a forward dip barring a conspiracy between Regge trajectories. Photoproduction of the A,(l+) meson followed by its decay is suggested as an important source of high energy forward pions. Submitted to Phys. Rev....
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Pion-photoproduction data is examined to check for the nucleon-helicity conservation predicted by asymptotic QCD. The differential cross section shows agreement with constituent-counting rules, and polarization data is not in disagreement with conservation of nucleon helicity. However large uncertainties in the polarization measurements do not allow a conclusive statement. The helicity amplitud...
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The γn → πp and γ p → π+n reactions are essential probes of the transition from meson-nucleon degrees of freedom to quark-gluon degrees of freedom in exclusive processes. The cross sections of these processes are also advantageous, for the investigation of oscillatory behavior around the quark counting prediction, since they decrease relatively slower with energy compared with other photon-indu...
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The inclusive A(γ, π+π−)X reaction is studied theoretically. A sizeable enhancement of the cross section is found, in comparison with the scaling of the deuteron cross section (σdA/2). This enhancement is due to the modifications in the nuclear medium of the γN → ππN amplitude and the pion dispersion relation. The enhancement is found to be bigger than the one already observed in the (π, ππ) re...
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ژورنال
عنوان ژورنال: Physical Review C
سال: 2012
ISSN: 0556-2813,1089-490X
DOI: 10.1103/physrevc.86.015202