TY  - JOUR
AU  - Debastiani, V. R.
AU  - Sakai, S.
AU  - Oset, E.
PY  - 2017
DA  - 2017//
TI  - Role of a triangle singularity in the pi N(1535) contribution to gamma p -> p pi(0) eta
T2  - Phys. Rev. C
JO  - Physical Review C
SP  - 025201
EP  - 7pp
VL  - 96
IS  - 2
PB  - Amer Physical Soc
AB  - We have studied the gamma p -> p pi(0) eta reaction paying attention to the two main mechanisms at low energies, the gamma p ->Delta(1700) -> eta Delta(1232) and the gamma p -> Delta(1700) -> pi N(1535). Both are driven by the photoexcitation of the Delta (1700) and the second one involves a mechanism that leads to a triangle singularity. We are able to evaluate quantitatively the cross section for this process and show that it agrees with the experimental determination. Yet there are some differences with the standard partial wave analysis which does not include explicitly the triangle singularity. The exercise also shows the convenience of exploring possible triangle singularities in other reactions and how a standard partial wave analysis can be extended to accommodate them.
SN  - 2469-9985
UR  - http://arxiv.org/abs/1703.01254
UR  - https://doi.org/10.1103/PhysRevC.96.025201
DO  - 10.1103/PhysRevC.96.025201
LA  - English
N1  - WOS:000406755100005
ID  - Debastiani_etal2017
ER  -