First Observation of 𝐷0⁢(+) → ¯𝐾⁢𝜔⁢𝑒+⁢𝜈𝑒 and Determination of the Branching Fraction of ¯𝐾1⁡(1270) → ¯𝐾⁡𝜔

Standard

First Observation of 𝐷0⁢(+) → ¯𝐾⁢𝜔⁢𝑒+⁢𝜈𝑒 and Determination of the Branching Fraction of ¯𝐾1⁡(1270) → ¯𝐾⁡𝜔 / BESIII Collaboration ; Ачасов, Михаил Николаевич ; Мучной, Николай Юрьевич et al.

In: Physical Review Letters, Vol. 137, No. 9, 091802, 26.08.2026.

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

BibTeX

@article{8587549b11894bd7912201a89704bd91,

title = "First Observation of 퐷0⁢(+) → ¯퐾⁢휔⁢푒+⁢휈푒 and Determination of the Branching Fraction of ¯퐾1⁡(1270) → ¯퐾⁡휔",

abstract = "Using 20.3 fb−1 of 푒+⁢푒− annihilation data collected at a center-of-mass energy of 3.773 GeV with the BESIII detector, we report the first observation of the semileptonic decays 퐷0 →퐾−⁢휔⁢푒+⁢휈푒 and 퐷+ →퐾0푆⁢휔⁢푒+⁢휈푒 with significances of 8.0⁢휎 and 5.8⁢휎, respectively. Their decay branching fractions are measured to be ℬ⁡(퐷0 →퐾−⁢휔⁢푒+⁢휈푒) =(9.4+2.0−1.8 ±0.6) ×10−5 and ℬ⁡(퐷+ →퐾0푆⁢휔⁢푒+⁢휈푒) =(8.0+2.4−2.1 ± 0.7) ×10−5. Combining these with the latest measurements of 퐷0⁢(+) →퐾−⁢휋+⁢휋−(0)⁢푒+⁢휈푒 and assuming ¯퐾1⁡(1270) to be the sole mediating resonance in all processes, the branching ratios are determined to be {[Γ⁡(퐾1⁢(1270)−→퐾−⁢휋+⁢휋−)]/[Γ⁡(퐾1⁢(1270)−→퐾−⁢휔)]}=3.4+0.8−0.7±0.3 and {[Γ⁡(¯퐾1⁢(1270)0→퐾−⁢휋+⁢휋0)]/[Γ⁡(¯퐾1⁢(1270)0→¯퐾0⁢휔)]}=7.9+2.4−2.1±0.7. The combined branching fraction is determined to be ℬ⁡(¯퐾1⁡(1270)→¯퐾⁡휔)=(8.4±1.4±0.5)%, which is the most precise measurement from a collider experiment. Furthermore, for the first time based on a single vector-pseudoscalar decay channel, the ¯퐾1⁡(1270) mass is measured to be (1336 ±9 ±2) MeV/푐2, providing unique experimental support for the two-pole structure of the ¯퐾1⁡(1270) resonance. The first uncertainties are statistical, and the second are systematic.",

keywords = "Leptonic, semileptonic & radiative decays, Charmed mesons",

author = "{BESIII Collaboration} and Ачасов, {Михаил Николаевич} and Мучной, {Николай Юрьевич} and Николаев, {Иван Борисович}",

note = "The BESIII Collaboration thanks the staff of BEPCII ([42]) and the IHEP computing center for their strong support. This work is supported in part by National Key R&D Program of China under Contracts No. 2023YFA1606000, No. 2023YFA1606704; National Natural Science Foundation of China (NSFC) under Contracts No. 11635010, No. 11935015, No. 11935016, No. 11935018, No. 12025502, No. 12035009, No. 12035013, No. 12061131003, No. 12192260, No. 12192261, No. 12192262, No. 12192263, No. 12192264, No. 12192265, No. 12221005, No. 12225509, No. 12235017, No. 12361141819, 12575102; the Chinese Academy of Sciences (CAS) Large-Scale Scientific Facility Program; the Strategic Priority Research Program of Chinese Academy of Sciences under Contract No. XDA0480600; CAS under Contract No. YSBR-101; 100 Talents Program of CAS; The Institute of Nuclear and Particle Physics (INPAC) and Shanghai Key Laboratory for Particle Physics and Cosmology; ERC under Contract No. 758462; German Research Foundation DFG under Contract No. FOR5327; Istituto Nazionale di Fisica Nucleare, Italy; Knut and Alice Wallenberg Foundation under Contracts No. 2021.0174, No. 2021.0299; Ministry of Development of Turkey under Contract No. DPT2006K-120470; National Research Foundation of Korea under Contract No. NRF-2022R1A2C1092335; National Science and Technology fund of Mongolia; Polish National Science Centre under Contract No. 2024/53/B/ST2/00975; STFC (United Kingdom); Swedish Research Council under Contract No. 2019.04595; U.S. Department of Energy under Contract No. DE-FG02-05ER41374.",

year = "2026",

month = aug,

day = "26",

doi = "10.1103/xn4s-xxs8",

language = "English",

volume = "137",

journal = "Physical Review Letters",

issn = "0031-9007",

publisher = "American Physical Society",

number = "9",

}

RIS

TY - JOUR

T1 - First Observation of 퐷0⁢(+) → ¯퐾⁢휔⁢푒+⁢휈푒 and Determination of the Branching Fraction of ¯퐾1⁡(1270) → ¯퐾⁡휔

AU - BESIII Collaboration

AU - Ачасов, Михаил Николаевич

AU - Мучной, Николай Юрьевич

AU - Николаев, Иван Борисович

N1 - The BESIII Collaboration thanks the staff of BEPCII ([42]) and the IHEP computing center for their strong support. This work is supported in part by National Key R&D Program of China under Contracts No. 2023YFA1606000, No. 2023YFA1606704; National Natural Science Foundation of China (NSFC) under Contracts No. 11635010, No. 11935015, No. 11935016, No. 11935018, No. 12025502, No. 12035009, No. 12035013, No. 12061131003, No. 12192260, No. 12192261, No. 12192262, No. 12192263, No. 12192264, No. 12192265, No. 12221005, No. 12225509, No. 12235017, No. 12361141819, 12575102; the Chinese Academy of Sciences (CAS) Large-Scale Scientific Facility Program; the Strategic Priority Research Program of Chinese Academy of Sciences under Contract No. XDA0480600; CAS under Contract No. YSBR-101; 100 Talents Program of CAS; The Institute of Nuclear and Particle Physics (INPAC) and Shanghai Key Laboratory for Particle Physics and Cosmology; ERC under Contract No. 758462; German Research Foundation DFG under Contract No. FOR5327; Istituto Nazionale di Fisica Nucleare, Italy; Knut and Alice Wallenberg Foundation under Contracts No. 2021.0174, No. 2021.0299; Ministry of Development of Turkey under Contract No. DPT2006K-120470; National Research Foundation of Korea under Contract No. NRF-2022R1A2C1092335; National Science and Technology fund of Mongolia; Polish National Science Centre under Contract No. 2024/53/B/ST2/00975; STFC (United Kingdom); Swedish Research Council under Contract No. 2019.04595; U.S. Department of Energy under Contract No. DE-FG02-05ER41374.

PY - 2026/8/26

Y1 - 2026/8/26

N2 - Using 20.3 fb−1 of 푒+⁢푒− annihilation data collected at a center-of-mass energy of 3.773 GeV with the BESIII detector, we report the first observation of the semileptonic decays 퐷0 →퐾−⁢휔⁢푒+⁢휈푒 and 퐷+ →퐾0푆⁢휔⁢푒+⁢휈푒 with significances of 8.0⁢휎 and 5.8⁢휎, respectively. Their decay branching fractions are measured to be ℬ⁡(퐷0 →퐾−⁢휔⁢푒+⁢휈푒) =(9.4+2.0−1.8 ±0.6) ×10−5 and ℬ⁡(퐷+ →퐾0푆⁢휔⁢푒+⁢휈푒) =(8.0+2.4−2.1 ± 0.7) ×10−5. Combining these with the latest measurements of 퐷0⁢(+) →퐾−⁢휋+⁢휋−(0)⁢푒+⁢휈푒 and assuming ¯퐾1⁡(1270) to be the sole mediating resonance in all processes, the branching ratios are determined to be {[Γ⁡(퐾1⁢(1270)−→퐾−⁢휋+⁢휋−)]/[Γ⁡(퐾1⁢(1270)−→퐾−⁢휔)]}=3.4+0.8−0.7±0.3 and {[Γ⁡(¯퐾1⁢(1270)0→퐾−⁢휋+⁢휋0)]/[Γ⁡(¯퐾1⁢(1270)0→¯퐾0⁢휔)]}=7.9+2.4−2.1±0.7. The combined branching fraction is determined to be ℬ⁡(¯퐾1⁡(1270)→¯퐾⁡휔)=(8.4±1.4±0.5)%, which is the most precise measurement from a collider experiment. Furthermore, for the first time based on a single vector-pseudoscalar decay channel, the ¯퐾1⁡(1270) mass is measured to be (1336 ±9 ±2) MeV/푐2, providing unique experimental support for the two-pole structure of the ¯퐾1⁡(1270) resonance. The first uncertainties are statistical, and the second are systematic.

AB - Using 20.3 fb−1 of 푒+⁢푒− annihilation data collected at a center-of-mass energy of 3.773 GeV with the BESIII detector, we report the first observation of the semileptonic decays 퐷0 →퐾−⁢휔⁢푒+⁢휈푒 and 퐷+ →퐾0푆⁢휔⁢푒+⁢휈푒 with significances of 8.0⁢휎 and 5.8⁢휎, respectively. Their decay branching fractions are measured to be ℬ⁡(퐷0 →퐾−⁢휔⁢푒+⁢휈푒) =(9.4+2.0−1.8 ±0.6) ×10−5 and ℬ⁡(퐷+ →퐾0푆⁢휔⁢푒+⁢휈푒) =(8.0+2.4−2.1 ± 0.7) ×10−5. Combining these with the latest measurements of 퐷0⁢(+) →퐾−⁢휋+⁢휋−(0)⁢푒+⁢휈푒 and assuming ¯퐾1⁡(1270) to be the sole mediating resonance in all processes, the branching ratios are determined to be {[Γ⁡(퐾1⁢(1270)−→퐾−⁢휋+⁢휋−)]/[Γ⁡(퐾1⁢(1270)−→퐾−⁢휔)]}=3.4+0.8−0.7±0.3 and {[Γ⁡(¯퐾1⁢(1270)0→퐾−⁢휋+⁢휋0)]/[Γ⁡(¯퐾1⁢(1270)0→¯퐾0⁢휔)]}=7.9+2.4−2.1±0.7. The combined branching fraction is determined to be ℬ⁡(¯퐾1⁡(1270)→¯퐾⁡휔)=(8.4±1.4±0.5)%, which is the most precise measurement from a collider experiment. Furthermore, for the first time based on a single vector-pseudoscalar decay channel, the ¯퐾1⁡(1270) mass is measured to be (1336 ±9 ±2) MeV/푐2, providing unique experimental support for the two-pole structure of the ¯퐾1⁡(1270) resonance. The first uncertainties are statistical, and the second are systematic.

KW - Leptonic, semileptonic & radiative decays

KW - Charmed mesons

UR - https://www.scopus.com/pages/publications/105050274417

U2 - 10.1103/xn4s-xxs8

DO - 10.1103/xn4s-xxs8

M3 - Article

VL - 137

JO - Physical Review Letters

JF - Physical Review Letters

SN - 0031-9007

IS - 9

M1 - 091802

ER -

ID: 83242297