PT Journal
AU Dai, LY
   Kang, XW
   Meissner, UG
   Song, XY
   Yao, DL
TI Amplitude analysis of the anomalous decay eta ' -> pi(+) pi(-) gamma
SO Physical Review D
JI Phys. Rev. D
PY 2018
BP 036012
EP 12pp
VL 97
IS 3
DI 10.1103/PhysRevD.97.036012
LA English
AB In this paper we perform an amplitude analysis of eta ' -> pi(+)pi(-)gamma and confront it with the latest BESIII data. Based on the final-state interaction theorem, we represent the amplitude in terms of an Omnes function multiplied by a form factor that corresponds to the contributions from left-hand cuts and right-hand cuts in the inelastic channels. We also take into account the isospin violation effect induced by rho-omega mixing. Our results show that the anomaly contribution is mandatory in order to explain the data. Its contribution to the decay width of Gamma(eta ' -> pi pi gamma) is larger than that induced by isospin violation. Finally we extract the pole positions of the rho and omega as well as their corresponding residues.
ER