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SUMMARY:Strangeness -1 Meson-Baryon scattering from UCHPT\, NLO
DTSTART;VALUE=DATE-TIME:20050628T150000Z
DTEND;VALUE=DATE-TIME:20050628T160000Z
DTSTAMP;VALUE=DATE-TIME:20261113T061710Z
UID:indico-event-1442@indico.ific.uv.es
DESCRIPTION:We first introduce briefly the formalism known as Unitary Chir
 al Perturbation Theory. This approach is suited to treatstrongly interacti
 ng system as the meson-meson\, meson-baryon or nucleon-nucleon ones from c
 hiral effective field theories. Then\, we focus on the strangeness $-1$ me
 son-baryon scattering including the ten interacting coupled channels $\\pi
 ^0\\Lambda$\, $\\pi^0\\Sigma^0$\, $\\pi^- \\Sigma^+$\, $\\pi^+\\Sigma^-$\,
  $K^-p$\, $\\bar{K}^0n$\, $\\eta \\Lambda$\, $\\eta\\Sigma^0$\, $K^0\\Xi^0
 $\, $K^+\\Xi^-$. We consider unitary chiral perturbation theory up to next
 -to-leading order\, which makes use of the ${\\mathcal O}(p^2)$ baryon chi
 ral perturbation amplitudes. We reproduce many experimental data: several 
 cross sections with $K^-p$ as initial state\, precisely measured ratios at
  the threshold of $K^-p$ to several other channels and the recent data on 
 kaonic hydrogen from the DEAR experiment (2004)\, around a factor of two m
 ore precise than the previous one from KEK (1998). We present our results 
 at order $p$ and $p^2$. We will pay special attention to the value of the 
 $K^-p$ elastic S-wave at threshold (relevant for the strong shift in kaoni
 c hydrogen)\, the two $\\Lambda(1405)$ poles\, and how they manifest in th
 e $\\pi\\Sigma$ event distributions. We will also discuss many other stran
 geness -1 resonances that orginate dynamically in our approach and show th
 e SU(3) representation to which they belong.\n\nhttps://indico.ific.uv.es/
 event/1442/
LOCATION:Edf. Institutos de Investigación Sala Seminarios IFIC
URL:https://indico.ific.uv.es/event/1442/
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