Summary
Lower bounds are obtained forT=0, 2s-wave π-π scattering lengths from unitarity, the nonexistence of a π-π bound state, and a certain amount of analyticity for the π-π scattering amplitudes. This analyticity and the corresponding twice-subtracted dispersion relations are consequences of axiomatic field theory.
Riassunto
Si ottengono dall’unitarietà, dalla non esistenza di uno stato legato ππ, e da una certa quantità di analiticità per le ampiezze di scattering ππ i limiti inferiori per le lunghezze di scattering ππ d’ondas perT=0, 2. Questa analiticità e le corrispondenti relazioni di dispersione due volte sottratte sono conseguenze della teoria di campo assiomatica.
Реэуме
Получаются нижние границы для длинs-волнового π-π рассеяния сT=0,2, исходя иэ унитарности, несушествования свяэанного состояния π-π и некоторой степени аналитичности для амплитуд π-π рассеяния. Эта аналитичность и соответствуюшие дисперсионные соотнощения с двукратным вычитанием являются следствиями аксиоматической теории поля.
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References
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See Appendix C of ref. (7).
See eq. (12) of ref. (5).
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See eq. (15) of ref. (11).
A. Martin:Nuovo Cimento,44 A, 1219 (1966).
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Common, A.K. Rigorous lower bounds toT=0 andT=2 π-πs-wave scattering lengths. Nuovo Cimento A (1965-1970) 63, 451–467 (1969). https://doi.org/10.1007/BF02756225
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DOI: https://doi.org/10.1007/BF02756225