We report an improved study of the semileptonic decay <InlineEquation ID="IEq2"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="13130_2025_25853_Article_IEq2.gif" Format="GIF" Height="23" Rendition="HTML" Resolution="72" Type="Linedraw" Width="124" /> </InlineMediaObject> <EquationSource Format="MATHML"><math display="inline"> <msup> <mi>D</mi> <mn>0</mn> </msup> <mo>→</mo> <msup> <mover accent="true"> <mi>K</mi> <mo stretchy="true">¯</mo> </mover> <mn>0</mn> </msup> <msup> <mi>π</mi> <mo>−</mo> </msup> <msup> <mi>e</mi> <mo>+</mo> </msup> <msub> <mi>ν</mi> <mi>e</mi> </msub> </math></EquationSource> <EquationSource Format="TEX">$ {D}^0\to {\overline{K}}^0{\pi}^{-}{e}^{+}{\nu}_e $</EquationSource> </InlineEquation> based on a sample of 7.9 fb−1 of e+e− annihilation data collected at a center-of-mass energy of 3.773 GeV with the BESIII detector at the BEPCII collider. The branching fraction of this decay is measured to be <InlineEquation ID="IEq3"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="13130_2025_25853_Article_IEq3.gif" Format="GIF" Height="33" Rendition="HTML" Resolution="72" Type="Linedraw" Width="158" /> </InlineMediaObject> <EquationSource Format="MATHML"><math display="inline"> <mi mathvariant="script">B</mi> <mfenced close=")" open="("> <mrow> <msup> <mi>D</mi> <mn>0</mn> </msup> <mo>→</mo> <msup> <mover accent="true"> <mi>K</mi> <mo stretchy="true">¯</mo> </mover> <mn>0</mn> </msup> <msup> <mi>π</mi> <mo>−</mo> </msup> <msup> <mi>e</mi> <mo>+</mo> </msup> <msub> <mi>ν</mi> <mi>e</mi> </msub> </mrow> </mfenced> </math></EquationSource> <EquationSource Format="TEX">$ \mathcal{B}\left({D}^0\to {\overline{K}}^0{\pi}^{-}{e}^{+}{\nu}_e\right) $</EquationSource> </InlineEquation> = (1.444 ± 0.022stat ± 0.024syst)%, which is the most precise to date, where the first uncertainty is statistical and the second is systematic. Based on investigation of the decay dynamics, we find that the decay is dominated by the K(892)− component and present an improved measurement of its branching fraction to be <InlineEquation ID="IEq4"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="13130_2025_25853_Article_IEq4.gif" Format="GIF" Height="23" Rendition="HTML" Resolution="72" Type="Linedraw" Width="179" /> </InlineMediaObject> <EquationSource Format="MATHML"><math display="inline"> <mi mathvariant="script">B</mi> <mfenced close=")" open="("> <mrow> <msup> <mi>D</mi> <mn>0</mn> </msup> <mo>→</mo> <msup> <mi>K</mi> <mo>∗</mo> </msup> <msup> <mfenced close=")" open="("> <mn>892</mn> </mfenced> <mo>−</mo> </msup> <msup> <mi>e</mi> <mo>+</mo> </msup> <msub> <mi>ν</mi> <mi>e</mi> </msub> </mrow> </mfenced> </math></EquationSource> <EquationSource Format="TEX">$ \mathcal{B}\left({D}^0\to {K}^{\ast }{(892)}^{-}{e}^{+}{\nu}_e\right) $</EquationSource> </InlineEquation> = (2.039 ± 0.032stat ± 0.034syst)%. We also determine the ratios of the hadronic form factors for the K(892)−e+νe decay to be rV = V(0)/A1(0) = 1.48 ± 0.05stat ± 0.02syst and r2 = A2(0)/A1(0) = 0.70 ± 0.04stat ± 0.02syst, where V(0) is the vector form factor and A1,2(0) are the axial form factors. In addition, the <InlineEquation ID="IEq5"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="13130_2025_25853_Article_IEq5.gif" Format="GIF" Height="21" Rendition="HTML" Resolution="72" Type="Linedraw" Width="45" /> </InlineMediaObject> <EquationSource Format="MATHML"><math display="inline"> <msup> <mover accent="true"> <mi>K</mi> <mo stretchy="true">¯</mo> </mover> <mn>0</mn> </msup> <msup> <mi>π</mi> <mo>−</mo> </msup> </math></EquationSource> <EquationSource Format="TEX">$ {\overline{K}}^0{\pi}^{-} $</EquationSource> </InlineEquation> <InlineEquation ID="IEq6"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="13130_2025_25853_Article_IEq6.gif" Format="GIF" Height="14" Rendition="HTML" Resolution="72" Type="Linedraw" Width="15" /> </InlineMediaObject> <EquationSource Format="MATHML"><math display="inline"> <mi mathvariant="script">S</mi> </math></EquationSource> <EquationSource Format="TEX">$ \mathcal{S} $</EquationSource> </InlineEquation>-wave component is found to account for (5.87 ± 0.32stat ± 0.16syst)% of the total decay rate, corresponding to a branching fraction of <InlineEquation ID="IEq7"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="13130_2025_25853_Article_IEq7.gif" Format="GIF" Height="34" Rendition="HTML" Resolution="72" Type="Linedraw" Width="219" /> </InlineMediaObject> <EquationSource Format="MATHML"><math display="inline"> <mi>B</mi> <mfenced close="]" open="["> <mrow> <msup> <mi>D</mi> <mn>0</mn> </msup> <mo>→</mo> <msub> <mfenced close=")" open="("> <mrow> <msup> <mover accent="true"> <mi>K</mi> <mo stretchy="true">¯</mo> </mover> <mn>0</mn> </msup> <msup> <mi>π</mi> <mo>−</mo> </msup> </mrow> </mfenced> <mrow> <mi>S</mi> <mo>−</mo> <mtext>wave</mtext> </mrow> </msub> <msup> <mi>e</mi> <mo>+</mo> </msup> <msub> <mi>ν</mi> <mi>e</mi> </msub> </mrow> </mfenced> </math></EquationSource> <EquationSource Format="TEX">$ B\left[{D}^0\to {\left({\overline{K}}^0{\pi}^{-}\right)}_{S-\textrm{wave}}{e}^{+}{\nu}_e\right] $</EquationSource> </InlineEquation> = (0.085 ± 0.005stat ± 0.003syst)%.

Study of the semileptonic decay $ {D}^0\to {\overline{K}}^0{\pi}^{-}{e}^{+}{\nu}_e $

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2025年3月26日

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M. Ablikim,
M. N. Achasov,
P. Adlarson,
O. Afedulidis,
X. C. Ai,
R. Aliberti,
A. Amoroso,
Y. Bai,
O. Bakina,
I. Balossino,
Y. Ban,
H.-R. Bao,
V. Batozskaya,
K. Begzsuren,
N. Berger,
M. Berlowski,
M. Bertani,
D. Bettoni,
F. Bianchi,
E. Bianco,
A. Bortone,
I. Boyko,
R. A. Briere,
A. Brueggemann,
H. Cai,
X. Cai,
A. Calcaterra,
G. F. Cao,
N. Cao,
S. A. Cetin,
X. Y. Chai,
J. F. Chang,
G. R. Che,
Y. Z. Che,
G. Chelkov,
C. Chen,
C. H. Chen,
Chao Chen,
G. Chen,
H. S. Chen,
H. Y. Chen,
M. L. Chen,
S. J. Chen,
S. L. Chen,
S. M. Chen,
T. Chen,
X. R. Chen,
X. T. Chen,
Y. B. Chen,
Y. Q. Chen,
Z. J. Chen,
S. K. Choi,
G. Cibinetto,
F. Cossio,
J. J. Cui,
H. L. Dai,
J. P. Dai,
A. Dbeyssi,
R. E. de Boer,
D. Dedovich,
C. Q. Deng,
Z. Y. Deng,
A. Denig,
I. Denysenko,
M. Destefanis,
F. De Mori,
B. Ding,
X. X. Ding,
Y. Ding,
Y. Ding,
J. Dong,
L. Y. Dong,
M. Y. Dong,
X. Dong,
M. C. Du,
S. X. Du,
Y. Y. Duan,
Z. H. Duan,
P. Egorov,
G. F. Fan,
J. J. Fan,
Y. H. Fan,
J. Fang,
J. Fang,
S. S. Fang,
W. X. Fang,
Y. Fang,
Y. Q. Fang,
R. Farinelli,
L. Fava,
F. Feldbauer,
G. Felici,
C. Q. Feng,
J. H. Feng,
Y. T. Feng,
M. Fritsch,
C. D. Fu,
J. L. Fu,
Y. W. Fu,
H. Gao,
X. B. Gao,
Y. N. Gao,
Y. N. Gao,
Yang Gao,
S. Garbolino,
I. Garzia,
P. T. Ge,
Z. W. Ge,
C. Geng,
E. M. Gersabeck,
A. Gilman,
K. Goetzen,
L. Gong,
W. X. Gong,
W. Gradl,
S. Gramigna,
M. Greco,
M. H. Gu,
Y. T. Gu,
C. Y. Guan,
A. Q. Guo,
L. B. Guo,
M. J. Guo,
R. P. Guo,
Y. P. Guo,
A. Guskov,
J. Gutierrez,
K. L. Han,
T. T. Han,
F. Hanisch,
X. Q. Hao,
F. A. Harris,
K. K. He,
K. L. He,
F. H. Heinsius,
C. H. Heinz,
Y. K. Heng,
C. Herold,
T. Holtmann,
P. C. Hong,
G. Y. Hou,
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B. Y. Hu,
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G. S. Huang,
K. X. Huang,
L. Q. Huang,
P. Huang,
X. T. Huang,
Y. P. Huang,
Y. S. Huang,
T. Hussain,
F. Hölzken,
N. Hüsken,
N. in der Wiesche,
J. Jackson,
S. Janchiv,
Q. Ji,
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W. Ji,
X. B. Ji,
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Y. Y. Ji,
X. Q. Jia,
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D. Jiang,
H. B. Jiang,
P. C. Jiang,
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J. B. Jiao,
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Z. Jiao,
S. Jin,
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T. Johansson,
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N. Kalantar-Nayestanaki,
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M. Kavatsyuk,
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C. H. Li,
Cheng Li,
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H. N. Li,
Hui Li,
J. R. Li,
J. S. Li,
K. Li,
K. L. Li,
L. J. Li,
L. K. Li,
Lei Li,
M. H. Li,
P. L. Li,
P. R. Li,
Q. M. Li,
Q. X. Li,
R. Li,
T. Li,
T. Y. Li,
W. D. Li,
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Z. Y. Li,
C. Liang,
H. Liang,
H. Liang,
Y. F. Liang,
Y. T. Liang,
G. R. Liao,
Y. P. Liao,
J. Libby,
A. Limphirat,
C. C. Lin,
C. X. Lin,
D. X. Lin,
T. Lin,
B. J. Liu,
B. X. Liu,
C. Liu,
C. X. Liu,
F. Liu,
F. H. Liu,
Feng Liu,
G. M. Liu,
H. Liu,
H. B. Liu,
H. H. Liu,
H. M. Liu,
Huihui Liu,
J. B. Liu,
J. Y. Liu,
K. Liu,
K. Y. Liu,
Ke Liu,
L. Liu,
L. C. Liu,
Lu Liu,
M. H. Liu,
P. L. Liu,
Q. Liu,
S. B. Liu,
T. Liu,
W. K. Liu,
W. M. Liu,
X. Liu,
X. Liu,
Y. Liu,
Y. Liu,
Y. B. Liu,
Z. A. Liu,
Z. D. Liu,
Z. Q. Liu,
X. C. Lou,
F. X. Lu,
H. J. Lu,
J. G. Lu,
Y. Lu,
Y. P. Lu,
Z. H. Lu,
C. L. Luo,
J. R. Luo,
M. X. Luo,
T. Luo,
X. L. Luo,
X. R. Lyu,
Y. F. Lyu,
F. C. Ma,
H. Ma,
H. L. Ma,
J. L. Ma,
L. L. Ma,
L. R. Ma,
M. M. Ma,
Q. M. Ma,
R. Q. Ma,
R. Y. Ma,
T. Ma,
X. T. Ma,
X. Y. Ma,
Y. M. Ma,
F. E. Maas,
I. MacKay,
M. Maggiora,
S. Malde,
Y. J. Mao,
Z. P. Mao,
S. Marcello,
Y. H. Meng,
Z. X. Meng,
J. G. Messchendorp,
G. Mezzadri,
H. Miao,
T. J. Min,
R. E. Mitchell,
X. H. Mo,
B. Moses,
N. Yu. Muchnoi,
J. Muskalla,
Y. Nefedov,
F. Nerling,
L. S. Nie,
I. B. Nikolaev,
Z. Ning,
S. Nisar,
Q. L. Niu,
W. D. Niu,
Y. Niu,
S. L. Olsen,
Q. Ouyang,
S. Pacetti,
X. Pan,
Y. Pan,
A. Pathak,
Y. P. Pei,
M. Pelizaeus,
H. P. Peng,
Y. Y. Peng,
K. Peters,
J. L. Ping,
R. G. Ping,
S. Plura,
V. Prasad,
F. Z. Qi,
H. Qi,
H. R. Qi,
M. Qi,
S. Qian,
W. B. Qian,
C. F. Qiao,
J. H. Qiao,
J. J. Qin,
L. Q. Qin,
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A. Rivetti,
M. Rolo,
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L. M. Zhang,
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X. M. Zhang,
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J. Z. Zhao,
L. Zhao,
Lei Zhao,
M. G. Zhao,
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R. P. Zhao,
S. J. Zhao,
Y. B. Zhao,
Y. X. Zhao,
Z. G. Zhao,
A. Zhemchugov,
B. Zheng,
B. M. Zheng,
J. P. Zheng,
W. J. Zheng,
X. R. Zheng,
Y. H. Zheng,
B. Zhong,
X. Zhong,
H. Zhou,
J. Y. Zhou,
L. P. Zhou,
S. Zhou,
X. Zhou,
X. K. Zhou,
X. R. Zhou,
X. Y. Zhou,
Y. Z. Zhou,
Z. C. Zhou,
A. N. Zhu,
J. Zhu,
K. Zhu,
K. J. Zhu,
K. S. Zhu,
L. Zhu,
L. X. Zhu,
S. H. Zhu,
T. J. Zhu,
W. D. Zhu,
W. Z. Zhu,
Y. C. Zhu,
Z. A. Zhu,
J. H. Zou,
J. Zu

摘要

We report an improved study of the semileptonic decay $D^{0} \to {\bar{K}}^{0} π^{-} e^{+} ν_{e}$ $ {D}^0\to {\overline{K}}^0{\pi}^{-}{e}^{+}{\nu}_e $ based on a sample of 7.9 fb⁻¹ of e⁺e⁻ annihilation data collected at a center-of-mass energy of 3.773 GeV with the BESIII detector at the BEPCII collider. The branching fraction of this decay is measured to be $B (D^{0} \to {\bar{K}}^{0} π^{-} e^{+} ν_{e})$ $ \mathcal{B}\left({D}^0\to {\overline{K}}^0{\pi}^{-}{e}^{+}{\nu}_e\right) $ = (1.444 ± 0.022_stat ± 0.024_syst)%, which is the most precise to date, where the first uncertainty is statistical and the second is systematic. Based on investigation of the decay dynamics, we find that the decay is dominated by the K^*(892)⁻ component and present an improved measurement of its branching fraction to be $B (D^{0} \to K^{*} {(892)}^{-} e^{+} ν_{e})$ $ \mathcal{B}\left({D}^0\to {K}^{\ast }{(892)}^{-}{e}^{+}{\nu}_e\right) $ = (2.039 ± 0.032_stat ± 0.034_syst)%. We also determine the ratios of the hadronic form factors for the K^*(892)⁻e⁺ν_e decay to be r_V = V(0)/A₁(0) = 1.48 ± 0.05_stat ± 0.02_syst and r₂ = A₂(0)/A₁(0) = 0.70 ± 0.04_stat ± 0.02_syst, where V(0) is the vector form factor and A_1,2(0) are the axial form factors. In addition, the ${\bar{K}}^{0} π^{-}$ $ {\overline{K}}^0{\pi}^{-} $ $S$ $ \mathcal{S} $ -wave component is found to account for (5.87 ± 0.32_stat ± 0.16_syst)% of the total decay rate, corresponding to a branching fraction of $B [D^{0} \to {({\bar{K}}^{0} π^{-})}_{S - wave} e^{+} ν_{e}]$ $ B\left[{D}^0\to {\left({\overline{K}}^0{\pi}^{-}\right)}_{S-\textrm{wave}}{e}^{+}{\nu}_e\right] $ = (0.085 ± 0.005_stat ± 0.003_syst)%.

Study of the semileptonic decay \( {D}^0\to {\overline{K}}^0{\pi}^{-}{e}^{+}{\nu}_e \)

摘要