%0 Journal Article
%T Role of the triangle singularity in Lambda(1405) production in the pi(-) p -> K-0 pi Sigma and pp -> pK(+) pi Sigma processes
%A Bayar, M.
%A Pavao, R.
%A Sakai, S.
%A Oset, E.
%J Physical Review C
%D 2018
%V 97
%N 3
%I Amer Physical Soc
%@ 2469-9985
%G English
%F Bayar_etal2018
%O WOS:000426780000004
%O exported from refbase (https://references.ific.uv.es/refbase/show.php?record=3510), last updated on Wed, 21 Mar 2018 14:52:31 +0000
%X We have investigated the cross section for the pi(-) p -> K-0 pi Sigma and pp -> pK(+) pi Sigma reactions, paying attention to a mechanism that develops a triangle singularity. The triangle diagram is realized by the decay of a N* to K* Sigma and the K* decay into pi K, and the pi Sigma finally merges into Lambda (1405). The mechanism is expected to produce a peak around 2140 MeV in the K Lambda (1405) invariant mass. We found that a clear peak appears around 2100 MeV in the K Lambda (1405) invariant mass, which is about 40 MeV lower than the expectation, and that is due to the resonance peak of a N* resonance which plays a crucial role in the K* Sigma production. The mechanism studied produces the peak of the Lambda (1405) around or below 1400 MeV, as is seen in the pp -> pK(+) pi Sigma HADES experiment.
%R 10.1103/PhysRevC.97.035203
%U http://arxiv.org/abs/1710.03964
%U https://doi.org/10.1103/PhysRevC.97.035203
%P 035203-12pp