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

TL;DR

This paper uses chiral dynamics to analyze K^- induced Lambda(1405) production off deuteron, revealing a resonance position at 1420 MeV and aligning with historical experimental data.

Contribution

It demonstrates that Lambda(1405) is predominantly produced via the KbarN channel and refines its resonance position in pi Sigma spectra using a coupled-channels approach.

Findings

Lambda(1405) resonance position is 1420 MeV.

Production favors KbarN channel initiation.

Model reproduces experimental cross sections.

Abstract

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