Observation of the semileptonic decays D^0→ K_S^0π^-π^0 e^+ ν_e and D^+→ K_S^0π^+π^- e^+ ν_e
arxiv(2024)
摘要
By analyzing e^+e^- annihilation data corresponding to an integrated
luminosity of 2.93 fb^-1 collected at a center-of-mass energy of 3.773
GeV with the BESIII detector, the first observation of the semileptonic
decays D^0→ K_S^0π^-π^0 e^+ ν_e and D^+→
K_S^0π^+π^- e^+ ν_e is reported. With a dominant hadronic contribution
from K_1(1270), the branching fractions are measured to be
ℬ(D^0→K_1(1270)^-(→
K^0_Sπ^-π^0)e^+ν_e)=(1.69^+0.53_-0.46±0.15)×10^-4 and
ℬ(D^+→K̅_1(1270)^0(→
K^0_Sπ^+π^-)e^+ν_e)=(1.47^+0.45_-0.40±0.20)×10^-4 with
statistical significance of 5.4σ and 5.6σ, respectively. When
combined with measurements of the K_1(1270)→ K^+π^-π decays, the
absolute branching fractions are determined to be ℬ(D^0→
K_1(1270)^-e^+ν_e)=(1.05^+0.33_-0.28±0.12±0.12)×10^-3 and
ℬ(D^+→K̅_1(1270)^0e^+ν_e)=(1.29^+0.40_-0.35±0.18±0.15)×10^-3.
The first and second uncertainties are statistical and systematic,
respectively, and the third uncertainties originate from the assumed branching
fractions of the K_1(1270)→ Kππ decays.
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