PT Journal
AU Ikeno, N
   Molina, R
   Oset, E
TI Triangle singularity mechanism for the pp -> pi(+)d fusion reaction
SO Physical Review C
JI Phys. Rev. C
PY 2021
BP 014614
EP 16pp
VL 104
IS 1
DI 10.1103/PhysRevC.104.014614
LA English
AB We develop a model for the pp -> pi(+)d reaction based on the pp -> Delta(1232)N transition followed by Delta(1232) -> pi N' decay and posterior fusion of NN' to give the deuteron. We show that the triangle diagram depicting this process develops a triangle singularity leading to a large cross section of this reaction compared to ordinary fusion reactions. The results of the calculation also show that the process is largely dominated by the pp system in L = 2 and S = 0, which transfers J = 2 to the final pi(+)d system. This feature is shown to be well suited to provide L = 2, S = 1, and J(tot) = 3 for np in the np(I = 0) pi(-)pp reaction followed by the pp -> pi(+)d reaction, which has been proposed recently, as a means of describing the so far assumed dibaryon d* (2380) peak.
ER