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Abstract |
We perform a calculation of the invariant mass distributions in the psi(3686) -> Lambda(Lambda) over bar eta reaction, where a neat peak for the excitation of the Lambda(1670) and (Lambda) over bar (1670) in the eta A and eta(Lambda) over bar mass distributions, respectively, is observed. Our approach uses the fact that the psi(3686), a c (c) over bar state, is a singlet of SU(3) in the u, d, s quarks and constructs the two flavor structures allowed with a pseudoscalar meson, a baryon and an antibaryon. The resonance peaks come from the final state interaction of meson baryon pairs, which generate the A(1670) in our approach. With a reasonable relative weight of the two flavor structures, the only free parameter of the theory, we are able to get the three mass distributions in good agreement with experiment, giving extra support to the molecular structure of the Lambda(1670) resonance. The agreement with data improves with an extra resonant contribution with mass around 2200 MeV, possibly accounting for some resonances. |
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Address |
[Ikeno, Natsumi] Kobe Univ, Grad Sch Maritime Sci, Kobe 6580022, Japan; [Oset, Eulogio] CSIC, Inst Invest Paterna, Dept Fis Teor & IFIC, Ctr Mixto Univ Valencia, Aptdo 22085, E-46071 Valencia, Spain, Email: ikeno@maritime.kobe-u.ac.jp |
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