Fleming, S.Kusunoki, M.Mehen, T.van Kolck, U.2014-05-202014-05-202007-08-01Physical Review D. College Pk: Amer Physical Soc, v. 76, n. 3, 12 p., 2007.1550-7998http://hdl.handle.net/11449/23185We consider pion interactions in an effective field theory of the narrow resonance X(3872), assuming it is a weakly bound molecule of the charm mesons D-0(D) over bar (*0) and D-*0(D) over bar (0). Since the hyperfine splitting of the D-0 and D-*0 is only 7 MeV greater than the neutral pion mass, pions can be produced near threshold and are nonrelativistic. We show that pion exchange can be treated in perturbation theory and calculate the next-to-leading-order correction to the partial decay width Gamma[X -> D-0(D) over bar (0)pi(0)].12engArtigo10.1103/PhysRevD.76.034006WOS:000249155700022Acesso abertoWOS000249155700022.pdf