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 D0→KS0π−π0e+νe and D+→KS0π+π−e+νe is reported. In the hypothesis that all events correspond to K1(1270) decays, the branching fractions are measured to be B(D0→K1(1270)−→KS0π−π0e+νe)=1.69−0.46+0.53±0.15×10−4 and B(D+→Kbar1(1270)0→KS0π+π−e+νe=1.47−0.40+0.45±0.14×10^−4 with statistical significance of 5.4σ and 5.6σ, respectively. When combined with measurements of the K1(1270) → K+π−π decays, the absolute branching fractions are determined to be B(D0→K1(1270)−e+νe)=1.08−0.13−0.10+0.14+0.08±0.21×10^−3 and B(D+→Kbar1(1270)0e+νe)=1.70−0.23+0.26±0.13±0.35×10^−3. The first and second uncertainties are statistical and systematic, respectively, and the third uncertainties originate from the assumed branching fractions of the K1(1270) → Kππ decays.
Observation of the semileptonic decays D0→KS0π−π0e+νe and D+→KS0π+π−e+νe
Amoroso, A.;Bianchi, F.;Destefanis, M.;De Mori, F.;Greco, M.;Maggiora, M.;Marcello, S.;Sosio, S.;Spataro, S.;
2024-01-01
Abstract
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 D0→KS0π−π0e+νe and D+→KS0π+π−e+νe is reported. In the hypothesis that all events correspond to K1(1270) decays, the branching fractions are measured to be B(D0→K1(1270)−→KS0π−π0e+νe)=1.69−0.46+0.53±0.15×10−4 and B(D+→Kbar1(1270)0→KS0π+π−e+νe=1.47−0.40+0.45±0.14×10^−4 with statistical significance of 5.4σ and 5.6σ, respectively. When combined with measurements of the K1(1270) → K+π−π decays, the absolute branching fractions are determined to be B(D0→K1(1270)−e+νe)=1.08−0.13−0.10+0.14+0.08±0.21×10^−3 and B(D+→Kbar1(1270)0e+νe)=1.70−0.23+0.26±0.13±0.35×10^−3. The first and second uncertainties are statistical and systematic, respectively, and the third uncertainties originate from the assumed branching fractions of the K1(1270) → Kππ decays.File | Dimensione | Formato | |
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