TY  - JOUR
AU  - Bayar, M.
AU  - Pavao, R.
AU  - Sakai, S.
AU  - Oset, E.
PY  - 2018
DA  - 2018//
TI  - Role of the triangle singularity in Lambda(1405) production in the pi(-) p -> K-0 pi Sigma and pp -> pK(+) pi Sigma processes
T2  - Phys. Rev. C
JO  - Physical Review C
SP  - 035203
EP  - 12pp
VL  - 97
IS  - 3
PB  - Amer Physical Soc
AB  - 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.
SN  - 2469-9985
UR  - http://arxiv.org/abs/1710.03964
UR  - https://doi.org/10.1103/PhysRevC.97.035203
DO  - 10.1103/PhysRevC.97.035203
LA  - English
N1  - WOS:000426780000004
ID  - Bayar_etal2018
ER  -