Eur. Phys. J. A (2007) 34: 405-412
https://doi.org/10.1140/epja/i2008-10518-5

Regular Article - Theoretical Physics

The role of the Λ(1405) in the pp → pK⁺Λ(1405) reaction

Departamento de Fısica Teórica and IFIC, Centro Mixto, Institutos de Investigación de Paterna, Universidad de Valencia-CSIC, Valencia, Spain

Received: 9 January 2008
Accepted: 10 January 2008
Published online: 24 January 2008

Abstract

We report a theoretical study of the pp → pK ⁺Λ(1405) reaction, which was recently investigated at COSY-Jülich by using a 3.65GeV/c circulating proton beam incident on an internal hydrogen target. The reaction is driven by single-kaon exchange, single-pion exchange, and single-rho exchange terms which have very different shapes due to the two-pole structure of the Λ(1405) and the presence of background terms. The shape for the sum of the three contributions, as well as the total cross-section, are consistent with present data within experimental and theoretical uncertainties, using reasonable form factors for the meson-baryon vertices.