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16–21 Aug 2019
Guilin Bravo Hotel, Guilin, China
Asia/Shanghai timezone

Effects of a triangle singularity on the production of Λ(1405) through πp and pp reactions

20 Aug 2019, 11:30
20m
Ludi Room (Guilin Bravo Hotel, Guilin, China)

Ludi Room

Guilin Bravo Hotel, Guilin, China

14 South Ronghu Road, Xiangshan, Guilin 541002, Guangxi, China
Parallel Session 5: Analysis tools Session 5: Analysis tools

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)

Presentation materials