Journal
PHYSICAL REVIEW D
Volume 61, Issue 11, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.61.114027
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The various dynamical scales below the pion mass involved in pi(+) pi(-) atoms are sequentially integrated out using nonrelativistic effective field theory techniques. This allows us to systematically organize 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.
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