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Chiral unitary approach to hadron spectroscopy

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Chiral unitary approach to hadron spectroscopy

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dc.contributor.author	Oset Báguena, Eulogio
dc.contributor.author	Inoue, T.
dc.contributor.author	Vicente Vacas, Manuel José
dc.contributor.author	Ramos Gómez, Àngels
dc.contributor.author	Bennhold, Cornelius
dc.date.accessioned	2014-10-28T13:32:38Z
dc.date.available	2014-10-28T13:32:38Z
dc.date.issued	2003
dc.identifier.citation	Oset Báguena, Eulogio Inoue, T. Vicente Vacas, Manuel José Ramos, A. Bennhold, Cornelius 2003 Chiral unitary approach to hadron spectroscopy International Journal of Modern Physics A 18 3 387 396
dc.identifier.uri	http://hdl.handle.net/10550/39450
dc.description.abstract	The s-wave meson-baryon interaction in the S = -1, S = 0 and S = -2 sectors is studied by means of coupled channels, using the lowest-order chiral Lagrangian and the N/D method or equivalently the Bethe-Salpeter equation to implement unitarity. This chiral approach leads to the dynamical generation of the Lambda(1405), Lambda(1670) and Sigma(1620) states for S = -1, the N* (1535) for S = 0 and the Xi(1620) for S = -2. We look for poles in the complex plane and extract the couplings of the resonances to the different final states. This allows identifying the Lambda(1405) and the Lambda(1670) resonances with (K) over barN and KXi quasibound states, respectively. Our results are found to be incompatible with the measured properties of the Xi(1690) resonance, thus ruling this state out as the remaining member of this octet of dynamically generated resonances. We therefore assign 1/2(-) for the spin and parity of the Xi(1620) resonance as the S = -2 member of the lowest-lying 1/2(-) octet.
dc.language.iso	eng
dc.relation.ispartof	International Journal of Modern Physics A, 2003, vol. 18, num. 3, p. 387-396
dc.subject	Física
dc.title	Chiral unitary approach to hadron spectroscopy
dc.type	journal article	es_ES
dc.date.updated	2014-10-28T13:32:38Z
dc.identifier.doi	10.1142/S0217751X03014307
dc.identifier.idgrec	008218
dc.rights.accessRights	open access	es_ES