Perturbative framework for the study of the properties of the pi+ pi- atom
Jun, 1997
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Abstract:
The perturbative framework is developed for the calculation of the pi(+)pi(-) atom characteristics (energy level shift and lifetime) on the basis of the field-theoretical Bethe-Salpeter approach. A closed expression for the first-order correction to the pi(+)pi(-) atom lifetime has been obtained.- bound state: (pi+ pi-)
- pi: hadronium
- atom: lifetime
- energy levels: correction
- Bethe-Salpeter equation
- perturbation theory: relativistic
- pi pi: scattering length
- atom: wave function
- n-point function
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