The role of the $N^*(2080)$ resonance in the $\vecγ p \to K^+ Λ(1520)$ reaction

Details The role of the $N^*(2080)$ resonance in the $\vecγ p \to K^+ Λ(1520)$ reaction The role of the $N^*(2080)$ resonance in the $\vecγ p \to K^+ Λ(1520)$ reaction

2010-07-19

arxiv.org/abs/1007.3141v2

Phys.Rev.C82:045205,2010

Physics

Nuclear Physics

Nuclear Theory

9 pages,6 figures, 1 table

Scientific paper

10.1103/PhysRevC.82.045205

We investigate the $\Lambda(1520)$ photo-production in the $\vec{\gamma} p \to K^+ \Lambda(1520)$ reaction within the effective Lagrangian method near threshold. In addition to the "background" contributions from the contact, $t-$channel $K$ exchange, and $s-$channel nucleon pole terms, which were already considered in previous works, the contribution from the nucleon resonance $N^*(2080)$ (spin-parity $J^P = 3/2^-$) is also considered. We show that the inclusion of the nucleon resonance $N^*(2080)$ leads to a fairly good description of the new LEPS differential cross section data, and that these measurements can be used to determine some of the properties of this latter resonance. However, serious discrepancies appear when the predictions of the model are compared to the photon-beam asymmetry also measured by the LEPS Collaboration.

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