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Autor:
Borasoy, B., Lipartia, E.
Publikováno v:
Phys.Rev. D71 (2005) 014027
We investigate the decays eta, eta-prime --> pi^+ pi^- gamma up to next-to-leading order in the framework of the combined 1/N_c and chiral expansions. Counter terms of unnatural parity at next-to-leading order with unknown couplings are important to
Externí odkaz:
http://arxiv.org/abs/hep-ph/0410141
Publikováno v:
Eur.Phys.J.C26:13-34,2002
We investigate the ground-state energy of the pi- p atom (pionic hydrogen) in the framework of QCD+QED. In particular, we evaluate the strong energy-level shift. We perform the calculation at next-to-leading order in the low-energy expansion in the f
Externí odkaz:
http://arxiv.org/abs/hep-ph/0206068
Publikováno v:
Phys.Lett. B533 (2002) 285-293
We construct the potentials that describe the spectrum and decay of electromagnetic bound states of hadrons, and are consistent with ChPT. These potentials satisfy the matching condition which enables one to express the parameters of the potential th
Externí odkaz:
http://arxiv.org/abs/hep-ph/0110186
The relativistic perturbative approach based on the Bethe-Salpeter (BS) equation is developed for the study of the characteristics of the hadronic pi+ pi- atom. The general expression for the atom lifetime is derived. Lowest-order corrections to the
Externí odkaz:
http://arxiv.org/abs/hep-ph/9810497
The paper has been withdrawn for further elaboration.
Comment: 5 pages, LaTeX, withdrawn for further elaboration
Comment: 5 pages, LaTeX, withdrawn for further elaboration
Externí odkaz:
http://arxiv.org/abs/hep-th/9808050
We review the existing theoretical approaches to the study of the observables of hadronic atoms. In the relativistic perturbative approach based on the Bethe-Salpeter equation and Chiral Perturbation Theory we derive the general expression for the pi
Externí odkaz:
http://arxiv.org/abs/hep-ph/9807474
Publikováno v:
Phys.Rev. D58 (1998) 094024
Hadronic (Pi+Pi-) atom is studied in the relativistic perturbative approach based on the Bethe-Salpeter equation. The general expression for the atom lifetime is derived. Lowest-order corrections to the relativistic Deser-type formula for the atom li
Externí odkaz:
http://arxiv.org/abs/hep-ph/9805356
Publikováno v:
Pisma Zh.Eksp.Teor.Fiz. 66 (1997) 747; JETP Lett. 66 (1997) 783-788
The perturbative framework is developed for the calculation of the pi(+)pi(-) atom characteristics 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 b
Externí odkaz:
http://arxiv.org/abs/hep-ph/9801215
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
Externí odkaz:
http://arxiv.org/abs/hep-ph/9706244