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A new perspective on the Faddeev equations and the (K)over-bar N N system from chiral dynamics and unitarity in coupled channels

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A new perspective on the Faddeev equations and the (K)over-bar N N system from chiral dynamics and unitarity in coupled channels

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dc.contributor.author	Oset Báguena, Eulogio
dc.contributor.author	Jido, D.
dc.contributor.author	Sekihara, T.
dc.contributor.author	Martínez Torres, Alberto
dc.contributor.author	Khemchandani, K. P.
dc.contributor.author	Bayar, Melahat
dc.contributor.author	Yamagata-Sekihara, Junko
dc.date.accessioned	2015-08-19T12:27:43Z
dc.date.available	2015-08-19T12:27:43Z
dc.date.issued	2012
dc.identifier.citation	Oset Báguena, Eulogio Jido, D. Sekihara, T. Martínez Torres, Alberto Khemchandani, K. P. Bayar, Melahat Yamagata-Sekihara, Junko 2012 A new perspective on the Faddeev equations and the (K)over-bar N N system from chiral dynamics and unitarity in coupled channels Nuclear Physics A 881 SI 127 140
dc.identifier.uri	http://hdl.handle.net/10550/46688
dc.description.abstract	We review recent work concerning the K¯N interaction and Faddeev equations with chiral dynamics which allow us to look at the K¯NN from a different perspective and pay attention to problems that have been posed in previous studies on the subject. We show results which provide extra experimental evidence on the existence of two Λ(1405) states. We then show the findings of a recent approach to Faddeev equations using chiral unitary dynamics, where an explicit cancellation of the two body off shell amplitude with three body forces stemming from the same chiral Lagrangians takes place. This removal of the unphysical off shell part of the amplitudes is most welcome and renders the approach unambiguous, showing that only on shell two body amplitudes need to be used. With this information in mind we use an approximation to the Faddeev equations within the fixed center approximation to study the K¯NN system, providing answers within this approximation to questions that have been brought before and evaluating binding energies and widths of this three body system. As a novelty with respect to recent work on the topic we find a bound state of the system with spin S=1, like a bound state of K¯-deuteron, less bound that the one of S=0, where all recent efforts have been devoted. The width is relatively large in this case, suggesting problems in a possible experimental observation.
dc.language.iso	eng
dc.relation.ispartof	Nuclear Physics A, 2012, vol. 881, num. SI, p. 127-140
dc.subject	Física
dc.title	A new perspective on the Faddeev equations and the (K)over-bar N N system from chiral dynamics and unitarity in coupled channels
dc.type	journal article	es_ES
dc.date.updated	2015-08-19T12:27:43Z
dc.identifier.doi	10.1016/j.nuclphysa.2012.02.005
dc.identifier.idgrec	080192
dc.rights.accessRights	open access	es_ES