TY  - JOUR
AU  - Dai, L. R.
AU  - Pavao, R.
AU  - Sakai, S.
AU  - Oset, E.
PY  - 2018
DA  - 2018//
TI  - Anomalous enhancement of the isospin-violating Lambda(1405) production by a triangle singularity in Lambda(c) ->pi(+)pi(0)pi(0)Sigma(0)
T2  - Phys. Rev. D
JO  - Physical Review D
SP  - 116004 - 10pp
VL  - 97
IS  - 11
PB  - Amer Physical Soc
AB  - The decay of Lambda(+)(c) into pi(+)pi(0) Lambda(1405) with the Lambda(1405) decay into pi(0)Sigma(0) through a triangle diagram is studied. This process is initiated by Lambda(+)(c) -> pi(+) (K) over bar N-*, and then the (K) over bar (*) decays into (K) over bar (pi) and (K) over bar N produce the Lambda(1405) through a triangle loop containing (K) over bar N-* (K) over bar which develops a singularity around 1890 MeV. This process is prohibited by the isospin symmetry, but the decay into this channel is enhanced by the contribution of the triangle diagram, which is sensitive to the mass of the internal particles. We find a narrow peak in the pi(0)Sigma(0) invariant mass distribution, which originates from the (K) over bar amplitude, but is tied to the mass differences between the charged and neutral (K) over bar or N states. The observation of the unavoidable peak of the triangle singularity in the isospin- violating Lambda(1405) production would provide further support for the hadronic molecular picture of the Lambda(1405) and further information on the (K) over bar N interaction.
SN  - 2470-0010
UR  - http://arxiv.org/abs/1804.01136
UR  - https://doi.org/10.1103/PhysRevD.97.116004
DO  - 10.1103/PhysRevD.97.116004
LA  - English
N1  - WOS:000434211200013
ID  - Dai_etal2018
ER  -