PT Journal
AU Molina, R
   Ikeno, N
   Oset, E
TI Sequential single pion production explaining the dibaryon "d*(2380)" peak
SO Chinese Physics C
JI Chin. Phys. C
PY 2023
BP 041001
EP 10pp
VL 47
IS 4
DI 10.1088/1674-1137/acb0b7
LA English
DE dibaryon; sequential mechanism; explanation
AB In this study, we investigate the two step sequential one pion production mechanism, that is, np(I=0)->pi(-)pp followed by the fusion reaction pp ->pi(+)d, to describe the np ->pi(+)pi(-)d reaction with in state I = 0 . In this reaction, a narrow peak identified with a " d(2380) " dibaryon has been previously observed. We discover that the second reaction step pp ->pi(+)d is driven by a triangle singularity that determines the position of the peak of the reaction and the high strength of the cross section. The combined cross section of these two mechanisms produces a narrow peak with a position, width, and strength, that are compatible with experimental observations within the applied approximations made. This novel interpretation of the peak accomplished without invoking a dibaryon explains why this peak has remained undetected in other reactions.
ER