Please use this identifier to cite or link to this item: http://hdl.handle.net/2445/12439
 Title: Effective field theory approach to pionium Author: Eiras, DolorsSoto Riera, Joan Keywords: Teoria de camps (Física)Partícules (Física nuclear)Interaccions electromagnètiquesMesons (Física nuclear)Field theory (Physics)Particles (Nuclear physics)Electroweak interactionsMesons Issue Date: 2000 Publisher: The American Physical Society Abstract: The various dynamical scales below the pion mass involved in $\pi^{+}$ $\pi^{-}$ atoms are sequentially integrated out using non-relativistic effective field theory techniques. This allows us to systematically organise the corrections to the energy levels and decay width. We present our results in terms of a single unknown constant which may be obtained by matching to the Chiral Lagrangian with electromagnetic interactions at two loops. Note: Reproducció digital del document publicat en format paper, proporcionada per PROLA i http://dx.doi.org/10.1103/PhysRevD.61.114027 It is part of: Physical Review D, 2000, vol. 61, núm. 11, p. 114027-1-114027-11 URI: http://hdl.handle.net/2445/12439 ISSN: 0556-2821 Appears in Collections: Articles publicats en revistes (Física Quàntica i Astrofísica)

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