Amplitude analysis and branching fraction measurement of Ds+ ? K ? K + ? + ? + ? ?

Abstract

Abstract: Using e+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 the BESIII detector, we perform an amplitude analysis of the decay Ds+ ? K?K+?+?+?? and determine the relative fractions and phases of different intermediate processes. Absolute branching fraction of Ds+? K?K+?+?+?? decay is measured to be (6.60 ± 0.47stat.± 0.38syst.) × 10?3. The dominant intermediate process is Ds+? a1(1260)+?, ? ? K?K+, a1(1260)+? ??+, ? ? ?+??, with a branching fraction of (5.15 ± 0.41stat.± 0.32syst.) × 10?3. [Figure not available: see fulltext.] © 2022, The Author(s).