Speaker
Rafael Pavao
(IFIC)
Description
In this work we study the effects of a triangle singularity in the cross sections of the πp → K⁰πΣ and pp → pK⁺πΣ reactions. The triangle mechanism is generated the following way: the initial scattering creates the N* resonance that decays into K*Σ, then, the K* decays into πK and the π fuses with Σ to create the Λ(1405). From this mechanism, a peak associated with the triangle singularity is expected to appear at Minv(KΛ(1405))= 2140 MeV, but in fact appears at Minv(KΛ(1405)) = 2100 MeV, due to the presence of the resonance peak of the N*. The position of the Λ(1405) is also shifted bellow 1400 MeV in the invariant mass of πΣ, as is seen in the pp → p K⁺πΣ HADES experiment.
[Based on Phys. Rev. C 97 035203 (2018)]
Primary authors
Prof.
Eulogio Oset
(IFIC, University of Valencia)
Dr
Melahat Bayar
(Kocaeli University)
Rafael Pavao
(IFIC)
Dr
Shuntaro Sakai
(ITP)
