Amplitude analysis and branching fraction measurement of $$ {D}_s^{+} $$ → K−K+π+π+π−

A bstract Using e + − annihilation data corresponding to a total integrated luminosity of 6 . 32 fb 1 collected at the center-of-mass energies between 4.178 and 4.226 GeV with BESIII detector, we perform an amplitude analysis decay $$ {D}_s^{+} D s + → K π determine relative fractions phases different intermediate processes. Absolute branching fraction is measured be (6 60 ± 0 47 stat 38 syst ) × 10 3 The dominant process (1260) ϕ, ϕ , ρπ ρ (5 15 41