Estudio de interacciones hadrónicas con $\Lambda^0\Lambda^0y \Lambda^0 p\pi^-$ en el estado final

Abstract

Interactions between hadronic particles are studied. Data collected by the fixed target experiment SELEX at Fermilab, which took data in 1996-97, were used. It was a multi-stage spectrometer, with high forward acceptance (xf >0.1). It was designed for high statistic systematic studies of the production mechanisms of hadrons. It used a Σ− y π − beam of 600 GeV/c and a proton beam of 540 GeV/c, interacting with copper and carbon targets. We found an accumulation in the invariant mass of Λ0Λ 0 at 2340 MeV/c2 with a width of 14 MeV; and in Λ0pπ− a 2215 MeV/c2 accumulation with a width of 1.9 MeV. Those accumulations indicate the first observation of a new particle and its excited state.