The sigma K coupling in the chiral unitary approach and the isoscalar (K)over-barN , (K)over-barA interaction
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The sigma K coupling in the chiral unitary approach and the isoscalar (K)over-barN , (K)over-barA interaction

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The sigma K coupling in the chiral unitary approach and the isoscalar (K)over-barN , (K)over-barA interaction

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dc.contributor.author Martínez Torres, Alberto
dc.contributor.author Khemchandani, K. P.
dc.contributor.author Oset Báguena, Eulogio
dc.date.accessioned 2015-09-07T11:16:41Z
dc.date.available 2015-09-07T11:16:41Z
dc.date.issued 2008
dc.identifier.uri http://hdl.handle.net/10550/46885
dc.description.abstract We evaluate the 'σ' exchange contribution to the K¯N→K¯N scattering within a chiral unitary approach. We show that the chiral transition potentials for ππ→KK¯ in the t-channel lead to a 'σ' contribution that vanishes in the K¯ forward direction and, hence, would produce a null 'σ' exchange contribution to the K− optical potential in nuclear matter in a simple impulse approximation. This is a consequence of the fact that the leading order chiral Lagrangian gives an I=0 ππ→KK¯ amplitude proportional to the squared momentum transfer, q2. This finding poses questions on the meaning or the origin of 'σ' exchange potentials used in relativistic mean field approaches to the K− nuclear selfenergy. This elementary 'σ' exchange potential in K¯N→K¯N is compared to the Weinberg-Tomozawa term and is found to be smaller than present theoretical uncertainties but will be relevant in the future when aiming at fitting increasingly more accurate data.
dc.language.iso eng
dc.relation.ispartof European Physical Journal A, 2008, vol. 36, num. 2, p. 211-218
dc.rights.uri info:eu-repo/semantics/openAccess
dc.source Martínez Torres, Alberto Khemchandani, K. P. Oset Báguena, Eulogio 2008 The sigma K coupling in the chiral unitary approach and the isoscalar (K)over-barN , (K)over-barA interaction European Physical Journal A 36 2 211 218
dc.subject Física
dc.title The sigma K coupling in the chiral unitary approach and the isoscalar (K)over-barN , (K)over-barA interaction
dc.type info:eu-repo/semantics/article
dc.date.updated 2015-09-07T11:16:41Z
dc.identifier.doi http://dx.doi.org/10.1140/epja/i2007-10574-3
dc.identifier.idgrec 079369

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