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Sep 5 – 9, 2022
online
US/Eastern timezone
Thank you to all the participants for a great QNP2022!

$\Lambda(1405)$ mediated triangle singularity in $K^-d\to p\Sigma^-$: a window to $\bar{K}N$ subthreshold amplitudes

Sep 7, 2022, 4:15 PM
25m
online

online

FSU, Tallahassee, FL, USA

Speaker

Albert Feijoo Aliau (IFIC)

Description

We study for the first time the $p\Sigma^-\to K^-d$ and $K^-d\to p\Sigma^-$ reactions close to threshold and show that they are driven by a triangle mechanism, with the $\Lambda(1405)$, a proton and a neutron as intermediate states, which develops a triangle singularity close to the $\bar{K}d$ threshold. We show that the cross section, well within measurable range, is very sensitive to different models that, while reproducing $\bar{K}N$ observables above threshold, provide different extrapolations of the $\bar{K}N$ amplitudes below threshold. The observables of this reaction will provide new constraints on the theoretical models, leading to more reliable extrapolations of the $\bar{K}N$ amplitudes below threshold and to more accurate predictions of the $\Lambda(1405)$ state of lower mass.

Primary authors

Albert Feijoo Aliau (IFIC) Prof. Eulogio Oset (F\'{\i}sica Te\'orica and IFIC, Centro Mixto Universidad de Valencia-CSIC ) Prof. Raquel Molina (IFIC) Prof. Lian Rong Dai (Huzhou University)

Presentation materials