6533b831fe1ef96bd1299707

RESEARCH PRODUCT

Λ(1520)andΣ(1385)in the nuclear medium

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description

Recent studies of the {lambda}(1520) resonance within chiral unitary theory with coupled channels find the resonance as a dynamically generated state from the interaction of the decuplet of baryons and the octet of mesons, essentially a quasibound state of {pi}{sigma}{sup *}(1385) in this case, although the coupling of the {lambda}(1520) to the KN and {pi}{sigma} makes this picture only approximate. The {pi}{sigma}{sup *}(1385) decay channel of the {lambda}(1520) is forbidden in free space for the nominal mass of the {sigma}{sup *}(1385), but the coupling of the {pi} to ph components in the nuclear medium opens new decay channels of the {lambda}(1520) in the nucleus and produces a much larger width. Together with medium modifications of the KN and {pi}{sigma} decay channels, the final width of the {lambda}(1520) at nuclear matter density is more than five times bigger than the free one. We perform the calculations by dressing simultaneously the {lambda}(1520) and the {sigma}{sup *}(1385) resonances, finding moderate changes in the mass but substantial ones in the width of both resonances.