Superconvergent Dispersion Relations and Electromagnetic Mass Differences
نویسندگان
چکیده
منابع مشابه
Electromagnetic mass differences of pions and kaons
We use the Cottingham method to calculate the pion and kaon electromagnetic mass differences with as few model dependent inputs as possible. The constraints of chiral symmetry at low energy, QCD at high energy and experimental data in between are used in the dispersion relation. We find excellent agreement with experiment for the pion mass difference. The kaon mass difference exhibits a strong ...
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We compute the electromagnetic mass differences of mesons containing a single heavy quark in terms of measurable data using QCD-based arguments in heavy-quark effective theory. We derive an unsubtracted dispersion relation that shows that the mass differences are calculable in terms of the properties of the lowest-lying physical intermediate states. We then consider the problem in the largeN li...
متن کاملThe Electromagnetic Mass Differences of Pions and Kaons
We use the Cottingham method to calculate the pion and kaon electromagnetic mass differences with as few model dependent inputs as possible. The constraints of chiral symmetry at low energy, QCD at high energy and experimental data in between are used in the dispersion relation. We find excellent agreement with experiment for the pion mass difference. The kaon mass difference exhibits a strong ...
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Positronium decay rates are computed at the one-loop level, using convolutiontype factorized amplitudes. The dynamics of this factorization is probed with dispersion relations, showing that unallowed approximations are usually made, and some O ( α ) corrections missed. Further, we discuss the relevance of the Schrödinger wavefunction as the basis for perturbative calculations. Finally, we apply...
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We use the one-loop chiral perturbation theory -scattering amplitude and dispersion theory in the form of the inverse amplitude method to study the quark-mass dependence of the two lightest resonances of the strong interactions, the f0 600 ( ) and the meson. As the main results, we find that the coupling constant is almost quark mass independent and that the mass shows a smooth quark-mass depen...
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ژورنال
عنوان ژورنال: Physical Review Letters
سال: 1966
ISSN: 0031-9007
DOI: 10.1103/physrevlett.17.1303