Kaon photoproduction: Background contributions, form factors, and missing resonances
نویسندگان
چکیده
منابع مشابه
Missing Resonances in Kaon Photoproduction on the Nucleon
New kaon photoproduction data on a proton, γ + p → K + Λ, are analyzed using a multipole approach. The background terms are given in terms of gauge invariant, crossing symmetric, Born diagrams with hadronic form factors, while the resonances are parameterized using Breit-Wigner forms. Preliminary results suggest a number of new resonances, as predicted by many quark model studies. A comparison ...
متن کاملKaon Photoproduction with Form Factors in a Gauge-invariant Approach
The general gauge-invariant photoproduction formalism given by Haberzettl is applied to kaon photoproduction off the nucleon at the tree level, with form factors describing composite nucleons. We demonstrate that, in contrast to Ohta’s gauge-invariance prescription, this formalism allows electric current contributions to be multiplied by a form factor, i.e., they do not need to be treated like ...
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New SAPHIR p(γ, K +)Λ total cross section data show a resonance structure at a total c.m. energy around 1900 MeV. We investigate this feature with an isobar model and find that the structure can be well explained by including a new D 13 resonance at 1895 MeV. Such a state has been predicted by a relativistic quark model at 1960 MeV with significant γN and KΛ branching ratios. We demonstrate how...
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Like any composite system the nucleon can be excited into a number of resonant or compound states. However, due to the nonperturbative nature of QCD at nucleon resonance energies no rigorous understanding of N resonances on the basis of QCD has emerged. Lattice QCD has only recently begun to contribute to this field. In a recent study 1 the excitation energies of 1/2 and 3/2 baryon resonances a...
متن کاملexcitations and “ missing resonances ” in the ω meson photoproduction
In this work, an improved quark model approach to the ω meson photoproduction with an effective Lagrangian is reported. The t-channel natural parity exchange is consistently taken into account through the Pomeron exchange, while the unnatural parity exchange is described by the π 0 exchange. It shows that with very limited number of parameters, all the available experimental data in the low ene...
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ژورنال
عنوان ژورنال: Physical Review C
سال: 2001
ISSN: 0556-2813,1089-490X
DOI: 10.1103/physrevc.65.015201