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.
2024
Inglese
Esperti anonimi
2024
9
0
19
20
charm meson, charmonium, K1(1270)
GERMANIA
REGNO UNITO DI GRAN BRETAGNA
STATI UNITI D'AMERICA
CILE
COREA DEL SUD
INDIA
MONGOLIA
PAESI BASSI
PAKISTAN
POLONIA
REPUBBLICA POPOLARE CINESE
RUSSIA
SVEZIA
THAILANDIA
TURCHIA
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null, null; Ablikim, M.; Achasov, M. N.; Adlarson, P.; Ai, X. C.; Aliberti, R.; Amoroso, A.; An, M. R.; An, Q.; Bai, Y.; Bakina, O.; Balossino, I.; Ba...espandi
info:eu-repo/semantics/article
open
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2318/2028021
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