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Determination of the {pi}{Sigma} scattering lengths from the weak decays of {Lambda}{sub c}

Journal Article · · Physical Review. C, Nuclear Physics
;  [1]
  1. Department of Physics, Tokyo Institute of Technology, Meguro, Tokyo 152-8551 (Japan)

The scattering lengths of the {pi}{Sigma} systems are key quantities in understanding the structure of the {Lambda}(1405) resonance and the subthreshold extrapolation of the KN interaction. We demonstrate that the {pi}{Sigma} scattering lengths can be extracted from the threshold cusp phenomena in the weak {Lambda}{sub c}{yields}{pi}{pi}{Sigma} decays, analogously with Cabibbo's method for determination of the {pi}{pi} scattering length. We show that the substantial cusp effect should be observed in the spectrum, when the {pi}{Sigma} interaction in I=0 is strongly attractive to generate a near-threshold singularity, such as a bound state or a virtual state.

OSTI ID:
21596782
Journal Information:
Physical Review. C, Nuclear Physics, Journal Name: Physical Review. C, Nuclear Physics Journal Issue: 3 Vol. 84; ISSN 0556-2813; ISSN PRVCAN
Country of Publication:
United States
Language:
English