Observation of D
Phys Rev Lett
; 132(13): 131903, 2024 Mar 29.
Article
em En
| MEDLINE
| ID: mdl-38613307
ABSTRACT
We perform for the first time an amplitude analysis of the decay D^{+}âK_{S}^{0}π^{+}η and report the observation of the decay D^{+}âK_{S}^{0}a_{0}(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, D^{+}âK_{S}^{0}a_{0}(980)^{+} is the ideal decay in extracting the contributions of the W-emission amplitudes involving a_{0}(980) and to study the final-state interactions. The absolute branching fraction of D^{+}âK_{S}^{0}π^{+}η is measured to be (1.27±0.04_{stat}±0.03_{syst})%. The branching fractions of intermediate processes D^{+}âK_{S}^{0}a_{0}(980)^{+} with a_{0}(980)^{+}âπ^{+}η and D^{+}âπ^{+}K[over ¯]_{0}^{*}(1430)^{0} with K[over ¯]_{0}^{*}(1430)^{0}âK_{S}^{0}η are measured to be (1.33±0.05_{stat}±0.04_{syst})% and (0.14±0.03_{stat}±0.01_{syst})%, respectively.
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MEDLINE
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En
Ano de publicação:
2024
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Article