We perform for the first time an amplitude analysis of the decay D+→KS0π+η and report the observation of the decay D+→KS0a0(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 a0(980) pseudoscalar, D+→KS0a0(980)+ is the ideal decay in extracting the contributions of the W-emission amplitudes involving a0(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+→KS0a0(980)+ with a0(980)+→π+η and D+→π+K¯0*(1430)0 with K¯0*(1430)0→KS0η are measured to be (1.33±0.05stat±0.04syst)% and (0.14±0.03stat±0.01syst)%, respectively.Received 23 September 2023Revised 10 January 2024Accepted 14 February 2024DOI:https://doi.org/10.1103/PhysRevLett.132.131903Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. Funded by SCOAP3.
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Mori et al. (2024) studied this question.
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