, Volume 42, Issue 2, pp 257-268

Kaonic production of $ \Lambda$ (1405) off deuteron target in chiral dynamics

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Abstract

The K--induced production of $ \Lambda$ (1405) is investigated in K - d $ \rightarrow$ $ \pi$ $ \Sigma$ n reactions based on coupled-channels chiral dynamics, in order to discuss the resonance position of the $ \Lambda$ (1405) in the $ \bar{{K}}$ N channel. We find that the K - d $ \rightarrow$ $ \Lambda$ (1405)n process favors the production of $ \Lambda$ (1405) initiated by the $ \bar{{K}}$ N channel. The present approach indicates that the $ \Lambda$ (1405) -resonance position is 1420MeV rather than 1405MeV in the $ \pi$ $ \Sigma$ invariant-mass spectra of K - d $ \rightarrow$ $ \pi$ $ \Sigma$ n reactions. This is consistent with an observed spectrum of the K - d $ \rightarrow$ $ \pi^{{+}}_{}$ $ \Sigma^{{-}}_{}$ n with 686-844MeV/c incident K- by bubble chamber experiments done in the 70s. Our model also reproduces the measured $ \Lambda$ (1405) production cross-section.

Communicated by U.-G. Meißner