Observation of the Singly Cabibbo Suppressed Decay <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"> <mml:msup> <mml:mi>D</mml:mi> <mml:mn>0</mml:mn> </mml:msup> <mml:mo stretchy="false">→</mml:mo> <mml:msub> <mml:mi>b</mml:m

By analyzing a data sample of e^{+}e^{-} collisions with center-of-mass energy sqrt[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 D^{0(+)} mesons into the axial-vector meson b_{1}(1235) via the decay b_{1}(1235)→ωπ. The decay D^{0}→b_{1}(1235)^{-}e^{+}ν_{e} is observed with a significance of 5.2σ after considering systematic uncertainty, while evidence for the decay D^{+}→b_{1}(1235)^{0}e^{+}ν_{e} is obtained with a 3.1σ significance. The product branching fractions are determined to be B[D^{0}→b_{1}(1235)^{-}e^{+}ν_{e}]×B[b_{1}(1235)^{-}→ωπ^{-}]=(0.72±0.18_{-0.08}^{+0.06})×10^{-4} and B[D^{+}→b_{1}(1235)^{0}e^{+}ν_{e}]×B[b_{1}(1235)^{0}→ωπ^{0}]=(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[D^{0}→b_{1}(1235)^{-}e^{+}ν_{e}]/2Γ[D^{+}→b_{1}(1235)^{0}e^{+}ν_{e}]}=0.78±0.19_{-0.05}^{+0.04}, which is consistent with unity, predicted by isospin invariance, within uncertainties.

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Publication Details

Journal
Physical Review Letters
Published
2025-11-24
DOI
https://doi.org/10.1103/4c4g-31zx
Primary Topic
Quantum Chromodynamics and Particle Interactions
Type
article
Field-Weighted Citation Impact
0.00
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article

Observation of the Singly Cabibbo Suppressed Decay <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"> <mml:msup> <mml:mi>D</mml:mi> <mml:mn>0</mml:mn> </mml:msup> <mml:mo stretchy="false">→</mml:mo> <mml:msub> <mml:mi>b</mml:m

Karl J. Friston
Physical Review Letters
Quantum Chromodynamics and Particle Interactions
article

Observation of the Singly Cabibbo Suppressed Decay <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"> <mml:msup> <mml:mi>D</mml:mi> <mml:mn>0</mml:mn> </mml:msup> <mml:mo stretchy="false">→</mml:mo> <mml:msub> <mml:mi>b</mml:m

Karl J. Friston
article en

Abstract

By analyzing a data sample of e^{+}e^{-} collisions with center-of-mass energy sqrt[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 D^{0(+)} mesons into the axial-vector meson b_{1}(1235) via the decay b_{1}(1235)→ωπ. The decay D^{0}→b_{1}(1235)^{-}e^{+}ν_{e} is observed with a significance of 5.2σ after considering systematic uncertainty, while evidence for the decay D^{+}→b_{1}(1235)^{0}e^{+}ν_{e} is obtained with a 3.1σ significance. The product branching fractions are determined to be B[D^{0}→b_{1}(1235)^{-}e^{+}ν_{e}]×B[b_{1}(1235)^{-}→ωπ^{-}]=(0.72±0.18_{-0.08}^{+0.06})×10^{-4} and B[D^{+}→b_{1}(1235)^{0}e^{+}ν_{e}]×B[b_{1}(1235)^{0}→ωπ^{0}]=(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[D^{0}→b_{1}(1235)^{-}e^{+}ν_{e}]/2Γ[D^{+}→b_{1}(1235)^{0}e^{+}ν_{e}]}=0.78±0.19_{-0.05}^{+0.04}, which is consistent with unity, predicted by isospin invariance, within uncertainties.

Physical Review LettersVol. 136(2)
University of Science and Technology Liaoning (CN), Liaoning University (CN), Università degli Studi del Piemonte Orientale “Amedeo Avogadro” (IT), Uppsala University (SE), University of Science and Technology of China (CN), University of Hawaii System (US), Central South University (CN), Guangxi University (CN), Nanjing Normal University (CN), Liaoning Normal University (CN), North China Electric Power University (CN), Shandong University (CN), COMSATS University Islamabad (PK), Hangzhou Normal University (CN), Hunan University (CN), Henan University of Science and Technology (CN), University of Groningen (NL), GSI Helmholtz Centre for Heavy Ion Research (DE), University of the Punjab (PK), Hunan Normal University (CN), Henan University (CN), Shanghai Jiao Tong University (CN), Yantai University (CN), University of Tarapacá (CL), South China Normal University (CN), Yunnan University (CN), Jilin University (CN), Johannes Gutenberg University Mainz (DE), Justus-Liebig-Universität Gießen (DE), University of Ferrara (IT), Qufu Normal University (CN), Peking University (CN), Nankai University (CN), University of Münster (DE), Sichuan University (CN), Fudan University (CN), Inner Mongolia University (CN), University of Perugia (IT), Shandong Normal University (CN), University of Manchester (GB), Guangxi Normal University (CN), China University of Geosciences (CN), Huangshan University (CN), Joint Institute for Nuclear Research (RU), University of Jinan (CN), Henan University of Technology (CN), University of Bristol (GB), Wuhan University (CN), Zhengzhou University (CN), University of Oxford (GB), Central China Normal University (CN), National Centre for Nuclear Research (PL), Istituto Nazionale di Fisica Nucleare, Sezione di Ferrara (IT), Helmholtz Institute Mainz (DE), Istinye University (TR), Institute of Modern Physics (CN), Jilin Medical University (CN), Shanxi University of Traditional Chinese Medicine (CN), Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Frascati (IT), Piedmont University (US), Istituto Nazionale di Fisica Nucleare, Sezione di Perugia (IT), University of Chinese Academy of Sciences (CN), Hebei University (CN), Budker Institute of Nuclear Physics (RU), China Center of Advanced Science and Technology (CN), University of Turin (IT), Indiana University (US), Chung-Ang University (KR), Near East University (CY), University of La Serena (CL), Carnegie Mellon University (US), Henan Normal University (CN), Zhejiang University (CN), Lanzhou University (CN), Renmin University of China (CN), Suranaree University of Technology (TH), Beihang University (CN), Nanjing University (CN), Ruhr University Bochum (DE), University of South China (CN), Shanxi Normal University (CN), Tsinghua University (CN)
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Quantum Chromodynamics and Particle Interactions
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