Observation of D → K ¯ 1 (1270)μ+νμ and test of lepton flavor universality with D → K ¯ 1 (1270)ℓ+νℓ

The BESIII collaboration

doi:10.1103/PhysRevD.111.L071101

Observation of D → K ¯ 1 (1270)μ+νμ and test of lepton flavor universality with D → K ¯ 1 (1270)ℓ+νℓ

The BESIII collaboration

Institute of Higher Research

CAS - Institute of High Energy Physics
Budker Institute of Nuclear Physics of the Siberian Branch of the RAS
Uppsala University
Ruhr University Bochum
Chinese Academy of Sciences
Zhengzhou University
Johannes Gutenberg University Mainz
University of Turin
National Institute for Nuclear Physics
University of Science and Technology of China
Southeast University, Nanjing
Joint Institute for Nuclear Research
Peking University
University of Chinese Academy of Sciences
National Centre for Nuclear Research
Mongolian Academy of Sciences
Carnegie Mellon University
University of Münster
Wuhan University
Istinye University
Nankai University
China University of Geosciences, Wuhan
Soochow University
Henan University
Nanjing University
North China Electric Power University
Tsinghua University
CAS - Institute of Modern Physics
Jilin University
Hunan University
Chung-Ang University
Shandong University
Yunnan University
Helmholtz Institute Mainz
University of South China
University of Jinan
Liaoning University
Sun Yat-Sen University
University of Eastern Piedmont
Nanjing Normal University
University of Ferrara
Henan Normal University
University of Manchester
University of Oxford
GSI Helmholtz Centre for Heavy Ion Research
Guangxi University
Shandong Normal University
Fudan University
Indiana University Bloomington
University of Hawai'i at Mānoa
Suranaree University of Technology
South China Normal University
University of the Punjab
Liaoning Normal University
Hangzhou Normal University
Huangshan College
University of Groningen
Indian Institute of Technology Madras
Justus Liebig University Giessen
Qufu Normal University
Renmin University of China
Lanzhou University
Hebei University
Sichuan University
Guangxi Normal University
Shanxi University
Central China Normal University
Henan University of Science and Technology
Henan University of Technology
Central South University
Zhejiang University
COMSATS University Islamabad
University of Perugia
Universidad de Tarapacá
Hunan Normal University
China Center of Advanced Science and Technology World Laboratory
Shanghai Jiao Tong University
Near East University
Beihang University
Inner Mongolia University
Yantai University
University of Bristol
Shanxi Normal University
University of Science and Technology Liaoning

Research output: Contribution to journal › Article › peer-review

3 Scopus citations

Abstract

By analyzing 7.93 fb-1 of e+e- collision data collected at the center-of-mass energy of 3.773 GeV with the BESIII detector operated at the BEPCII collider, we report the observation of the semimuonic decays of D+→K̄1(1270)0μ+νμ and D0→K1(1270)-μ+νμ with statistical significances of 12.5σ and 6.0σ, respectively. Their decay branching fractions are determined to be B[D+→K̄1(1270)0μ+νμ]=(2.36±0.20-0.27+0.18±0.48)×10-3 and B[D0→K1(1270)-μ+νμ]=(0.78±0.11-0.09+0.05±0.15)×10-3, where the first and second uncertainties are statistical and systematic, respectively, and the third originates from the input branching fraction of K̄1(1270)0→K-π+π0 or K1(1270)-→K-π+π-. Combining our branching fractions with the previous measurements of B[D+→K̄1(1270)0e+νe] and B[D0→K1(1270)-e+νe], we determine the branching fraction ratios to be B[D+→K̄1(1270)0μ+νμ]/B[D+→K̄1(1270)0e+νe]=1.03±0.14-0.15+0.11 and B[D0→K1(1270)-μ+νμ]/B[D0→K1(1270)-e+νe]=0.74±0.13-0.13+0.08. Using the branching fractions measured in this work and the world-average lifetimes of the D+ and D0 mesons, we determine the semimuonic partial decay width ratio to be Γ[D+→K̄1(1270)0μ+νμ]/Γ[D0→K1(1270)-μ+νμ]=1.22±0.10-0.09+0.06, which is consistent with unity as predicted by isospin conservation.

Original language	English
Article number	L071101
Journal	Physical Review D
Volume	111
Issue number	7
DOIs	https://doi.org/10.1103/PhysRevD.111.L071101
State	Published - 1 Apr 2025

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10.1103/PhysRevD.111.L071101

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@article{0a5bdab8803e4d03a7970e6a4ec4f849,

title = "Observation of D → K ¯ 1 (1270)μ+νμ and test of lepton flavor universality with D → K ¯ 1 (1270)ℓ+νℓ",

abstract = "By analyzing 7.93 fb-1 of e+e- collision data collected at the center-of-mass energy of 3.773 GeV with the BESIII detector operated at the BEPCII collider, we report the observation of the semimuonic decays of D+→{\=K}1(1270)0μ+νμ and D0→K1(1270)-μ+νμ with statistical significances of 12.5σ and 6.0σ, respectively. Their decay branching fractions are determined to be B[D+→{\=K}1(1270)0μ+νμ]=(2.36±0.20-0.27+0.18±0.48)×10-3 and B[D0→K1(1270)-μ+νμ]=(0.78±0.11-0.09+0.05±0.15)×10-3, where the first and second uncertainties are statistical and systematic, respectively, and the third originates from the input branching fraction of {\=K}1(1270)0→K-π+π0 or K1(1270)-→K-π+π-. Combining our branching fractions with the previous measurements of B[D+→{\=K}1(1270)0e+νe] and B[D0→K1(1270)-e+νe], we determine the branching fraction ratios to be B[D+→{\=K}1(1270)0μ+νμ]/B[D+→{\=K}1(1270)0e+νe]=1.03±0.14-0.15+0.11 and B[D0→K1(1270)-μ+νμ]/B[D0→K1(1270)-e+νe]=0.74±0.13-0.13+0.08. Using the branching fractions measured in this work and the world-average lifetimes of the D+ and D0 mesons, we determine the semimuonic partial decay width ratio to be Γ[D+→{\=K}1(1270)0μ+νμ]/Γ[D0→K1(1270)-μ+νμ]=1.22±0.10-0.09+0.06, which is consistent with unity as predicted by isospin conservation.",

author = "M. Ablikim and Achasov, \{M. N.\} and P. Adlarson and O. Afedulidis and S. Kabana and \{The BESIII collaboration\}",

note = "Publisher Copyright: {\textcopyright} 2025 authors.",

year = "2025",

month = apr,

day = "1",

doi = "10.1103/PhysRevD.111.L071101",

language = "English",

volume = "111",

journal = "Physical Review D",

issn = "2470-0010",

number = "7",

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TY - JOUR

T1 - Observation of D → K ¯ 1 (1270)μ+νμ and test of lepton flavor universality with D → K ¯ 1 (1270)ℓ+νℓ

AU - Ablikim, M.

AU - Achasov, M. N.

AU - Adlarson, P.

AU - Afedulidis, O.

AU - Kabana, S.

AU - The BESIII collaboration

PY - 2025/4/1

Y1 - 2025/4/1

N2 - By analyzing 7.93 fb-1 of e+e- collision data collected at the center-of-mass energy of 3.773 GeV with the BESIII detector operated at the BEPCII collider, we report the observation of the semimuonic decays of D+→K̄1(1270)0μ+νμ and D0→K1(1270)-μ+νμ with statistical significances of 12.5σ and 6.0σ, respectively. Their decay branching fractions are determined to be B[D+→K̄1(1270)0μ+νμ]=(2.36±0.20-0.27+0.18±0.48)×10-3 and B[D0→K1(1270)-μ+νμ]=(0.78±0.11-0.09+0.05±0.15)×10-3, where the first and second uncertainties are statistical and systematic, respectively, and the third originates from the input branching fraction of K̄1(1270)0→K-π+π0 or K1(1270)-→K-π+π-. Combining our branching fractions with the previous measurements of B[D+→K̄1(1270)0e+νe] and B[D0→K1(1270)-e+νe], we determine the branching fraction ratios to be B[D+→K̄1(1270)0μ+νμ]/B[D+→K̄1(1270)0e+νe]=1.03±0.14-0.15+0.11 and B[D0→K1(1270)-μ+νμ]/B[D0→K1(1270)-e+νe]=0.74±0.13-0.13+0.08. Using the branching fractions measured in this work and the world-average lifetimes of the D+ and D0 mesons, we determine the semimuonic partial decay width ratio to be Γ[D+→K̄1(1270)0μ+νμ]/Γ[D0→K1(1270)-μ+νμ]=1.22±0.10-0.09+0.06, which is consistent with unity as predicted by isospin conservation.

AB - By analyzing 7.93 fb-1 of e+e- collision data collected at the center-of-mass energy of 3.773 GeV with the BESIII detector operated at the BEPCII collider, we report the observation of the semimuonic decays of D+→K̄1(1270)0μ+νμ and D0→K1(1270)-μ+νμ with statistical significances of 12.5σ and 6.0σ, respectively. Their decay branching fractions are determined to be B[D+→K̄1(1270)0μ+νμ]=(2.36±0.20-0.27+0.18±0.48)×10-3 and B[D0→K1(1270)-μ+νμ]=(0.78±0.11-0.09+0.05±0.15)×10-3, where the first and second uncertainties are statistical and systematic, respectively, and the third originates from the input branching fraction of K̄1(1270)0→K-π+π0 or K1(1270)-→K-π+π-. Combining our branching fractions with the previous measurements of B[D+→K̄1(1270)0e+νe] and B[D0→K1(1270)-e+νe], we determine the branching fraction ratios to be B[D+→K̄1(1270)0μ+νμ]/B[D+→K̄1(1270)0e+νe]=1.03±0.14-0.15+0.11 and B[D0→K1(1270)-μ+νμ]/B[D0→K1(1270)-e+νe]=0.74±0.13-0.13+0.08. Using the branching fractions measured in this work and the world-average lifetimes of the D+ and D0 mesons, we determine the semimuonic partial decay width ratio to be Γ[D+→K̄1(1270)0μ+νμ]/Γ[D0→K1(1270)-μ+νμ]=1.22±0.10-0.09+0.06, which is consistent with unity as predicted by isospin conservation.

UR - https://www.scopus.com/pages/publications/105003551006

U2 - 10.1103/PhysRevD.111.L071101

DO - 10.1103/PhysRevD.111.L071101

M3 - Article

AN - SCOPUS:105003551006

SN - 2470-0010

VL - 111

JO - Physical Review D

JF - Physical Review D

IS - 7

M1 - L071101

ER -

Observation of D → K ¯ 1 (1270)μ+νμ and test of lepton flavor universality with D → K ¯ 1 (1270)ℓ+νℓ

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