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Threshold effects in excited charmed baryon decays

Andrew E. Blechman·Adam F. Falk·Dan Pirjol·John M. Yelton
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Abstract

Motivated by recent results on charmed baryons from CLEO and FOCUS, we reexamine the couplings of the orbitally excited charmed baryons. Due to its proximity to the [Sigma_c pi] threshold, the strong decays of the Lambda_c(2593) are sensitive to finite width effects. This distorts the shape of the invariant mass spectrum in Lambda_{c1}-> Lambda_c pi^+pi^- from a simple Breit-Wigner resonance, which has implications for the experimental extraction of the Lambda_c(2593) mass and couplings. We perform a fit to unpublished CLEO data which gives M(Lambda_c(2593)) - M(Lambda_c) = 305.6 +- 0.3 MeV and h2^2 = 0.24^{+0.23}_{-0.11}, with h2 the Lambda_{c1}-> Sigma_c pi strong coupling in the chiral Lagrangian. We also comment on the new orbitally excited states recently observed by CLEO.

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Andrew E. Blechman, Adam F. Falk, Dan Pirjol, John M. Yelton. 2003-02-05. Threshold effects in excited charmed baryon decays. https://doi.org/10.1103/physrevd.67.074033

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