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Observation of D → K ¯ 1 (1270)μ+νμ and test of lepton flavor universality with D → K ¯ 1 (1270)ℓ+νℓ. / BESIII Collaboration ; Мучной, Николай Юрьевич.

In: Physical Review D, Vol. 111, No. 7, L071101, 18.04.2025.

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

Harvard

BESIII Collaboration & Мучной, НЮ 2025, 'Observation of D → K ¯ 1 (1270)μ+νμ and test of lepton flavor universality with D → K ¯ 1 (1270)ℓ+νℓ', Physical Review D, vol. 111, no. 7, L071101. https://doi.org/10.1103/PhysRevD.111.L071101

APA

BESIII Collaboration, & Мучной, Н. Ю. (2025). Observation of D → K ¯ 1 (1270)μ+νμ and test of lepton flavor universality with D → K ¯ 1 (1270)ℓ+νℓ. Physical Review D, 111(7), [L071101]. https://doi.org/10.1103/PhysRevD.111.L071101

Vancouver

BESIII Collaboration, Мучной НЮ. Observation of D → K ¯ 1 (1270)μ+νμ and test of lepton flavor universality with D → K ¯ 1 (1270)ℓ+νℓ. Physical Review D. 2025 Apr 18;111(7):L071101. doi: 10.1103/PhysRevD.111.L071101

Author

BESIII Collaboration ; Мучной, Николай Юрьевич. / Observation of D → K ¯ 1 (1270)μ+νμ and test of lepton flavor universality with D → K ¯ 1 (1270)ℓ+νℓ. In: Physical Review D. 2025 ; Vol. 111, No. 7.

BibTeX

@article{fd5ce9b0e73d4d22a9792842c0be2f21,
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 = "{BESIII Collaboration} and Achasov, {M. N.} and Nikolaev, {I. B.} and Мучной, {Николай Юрьевич}",
year = "2025",
month = apr,
day = "18",
doi = "10.1103/PhysRevD.111.L071101",
language = "English",
volume = "111",
journal = "Physical Review D",
issn = "2470-0010",
publisher = "American Physical Society",
number = "7",

}

RIS

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 - BESIII Collaboration

AU - Achasov, M. N.

AU - Nikolaev, I. B.

AU - Мучной, Николай Юрьевич

PY - 2025/4/18

Y1 - 2025/4/18

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.mendeley.com/catalogue/508f1e4a-7d21-3942-a680-b801abf3284f/

U2 - 10.1103/PhysRevD.111.L071101

DO - 10.1103/PhysRevD.111.L071101

M3 - Article

VL - 111

JO - Physical Review D

JF - Physical Review D

SN - 2470-0010

IS - 7

M1 - L071101

ER -

ID: 71514503