TY - JOUR
T1 - Observation of the Singly Cabibbo Suppressed Decay D0 →b1 (1235)-e+νe and Evidence for D+ →b1 (1235)0e+νe
AU - Ablikim, M.
AU - Achasov, M. N.
AU - Adlarson, P.
AU - Afedulidis, O.
AU - Kabana, S.
AU - The BESIII collaboration
N1 - Publisher Copyright:
© 2026 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the "https://creativecommons.org/licenses/by/4.0/"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 SCOAP
PY - 2026/1/16
Y1 - 2026/1/16
N2 - By analyzing a data sample of e+e- collisions with center-of-mass energy s=3.773 GeV, corresponding to an integrated luminosity of 7.9 fb-1 collected with the BESIII detector operating at the BEPCII collider, we study semileptonic decays of the D0(+) mesons into the axial-vector meson b1(1235) via the decay b1(1235)→ωπ. The decay D0→b1(1235)-e+νe is observed with a significance of 5.2σ after considering systematic uncertainty, while evidence for the decay D+→b1(1235)0e+νe is obtained with a 3.1σ significance. The product branching fractions are determined to be B[D0→b1(1235)-e+νe]×B[b1(1235)-→ωπ-]=(0.72±0.18-0.08+0.06)×10-4 and B[D+→b1(1235)0e+νe]×B[b1(1235)0→ωπ0]=(1.16±0.44±0.16)×10-4, where the first uncertainties are statistical and the second systematic. The ratio of their partial decay widths is determined to be {Γ[D0→b1(1235)-e+νe]/2Γ[D+→b1(1235)0e+νe]}=0.78±0.19-0.05+0.04, which is consistent with unity, predicted by isospin invariance, within uncertainties.
AB - By analyzing a data sample of e+e- collisions with center-of-mass energy s=3.773 GeV, corresponding to an integrated luminosity of 7.9 fb-1 collected with the BESIII detector operating at the BEPCII collider, we study semileptonic decays of the D0(+) mesons into the axial-vector meson b1(1235) via the decay b1(1235)→ωπ. The decay D0→b1(1235)-e+νe is observed with a significance of 5.2σ after considering systematic uncertainty, while evidence for the decay D+→b1(1235)0e+νe is obtained with a 3.1σ significance. The product branching fractions are determined to be B[D0→b1(1235)-e+νe]×B[b1(1235)-→ωπ-]=(0.72±0.18-0.08+0.06)×10-4 and B[D+→b1(1235)0e+νe]×B[b1(1235)0→ωπ0]=(1.16±0.44±0.16)×10-4, where the first uncertainties are statistical and the second systematic. The ratio of their partial decay widths is determined to be {Γ[D0→b1(1235)-e+νe]/2Γ[D+→b1(1235)0e+νe]}=0.78±0.19-0.05+0.04, which is consistent with unity, predicted by isospin invariance, within uncertainties.
UR - https://www.scopus.com/pages/publications/105028287868
U2 - 10.1103/4c4g-31zx
DO - 10.1103/4c4g-31zx
M3 - Article
AN - SCOPUS:105028287868
SN - 0031-9007
VL - 136
JO - Physical Review Letters
JF - Physical Review Letters
IS - 2
M1 - 021801
ER -