TY  - JOUR
AU  - Feijoo, A.
AU  - Molina, R.
AU  - Dai, L. R.
AU  - Oset, E.
PY  - 2022
DA  - 2022//
TI  - Lambda(1405) mediated triangle singularity in the K(-)d -> p Sigma(-) reaction
T2  - Eur. Phys. J. C
JO  - European Physical Journal C
SP  - 1028
EP  - 16pp
VL  - 82
IS  - 11
PB  - Springer
AB  - We study for the first time the p Sigma(-) -> K- d and K- d -> p Sigma(-) reactions close to threshold and show that they are driven by a triangle mechanism, with the Lambda(1405), a proton and a neutron as intermediate states, which develops a triangle singularity close to the (K) over bard threshold. We find that a mechanism involving virtual pion exchange and the K- p -> pi(+)Sigma(-) amplitude dominates over another one involving kaon exchange and the K- p -> K- p amplitude. Moreover, of the two Lambda(1405) states, the one with higher mass around 1420 MeV, gives the largest contribution to the process. We show that the cross section, well within measurable range, is very sensitive to different models that, while reproducing (K) over barN observables above threshold, provide different extrapolations of the (K) over barN amplitudes below threshold. The observables of this reaction will provide new constraints on the theoretical models, leading to more reliable extrapolations of the (K) over barN amplitudes below threshold and to more accurate predictions of the Lambda(1405) state of lower mass.
SN  - 1434-6044
UR  - https://arxiv.org/abs/2105.09654
UR  - https://doi.org/10.1140/epjc/s10052-022-10985-8
DO  - 10.1140/epjc/s10052-022-10985-8
LA  - English
N1  - WOS:000884904400008
ID  - Feijoo_etal2022
ER  -