Observation of D+ →†’ KS0α0(980)+ in the Amplitude Analysis of D+ →†’ KS0π€+η

• We perform for the first time an amplitude analysis of the decay D+ → KS0π+η and report the observation of the decay D+ → KS0α0(980)+ using 2.93 fb-1 of e+e- collision data taken at a center-of-mass energy of 3.773 GeV with the BESIII detector. As the only W-annihilation-free decay among D to a(0) (980) pseudoscalar, S is the ideal decay in extracting the contributions of the W-emission amplitudes involving α0(980) and to study the final-state interactions. The absolute branching fraction of D+ → KS0π+η is measured to be (1.27± 0.04stat ± 0.03syst)%. The branching fractions of intermediate processes D+ → KS0α0(980)+ with α0(980)+ → π+η and D+ → π+K(over bar)0*(1430)0 with K(over bar)0*(1430)0 → KS0η are measured to be (1.33 ± 0.05stat ± 0.04syst)% and (0.14 ± 0.03stat ± 0.01syst)%, respectively.

Subject headings

NATURVETENSKAP  -- Fysik -- Subatomär fysik (hsv//swe)

NATURAL SCIENCES  -- Physical Sciences -- Subatomic Physics (hsv//eng)

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art (subject category)