TY - JOUR

T1 - Observation of D+→η′μ+νμ and First Experimental Study of D+→η′ℓ+νℓ Decay Dynamics

AU - BESIII Collaboration

AU - Ablikim, M.

AU - Achasov, M. n.

AU - Николаев, Иван Борисович

AU - Мучной, Николай Юрьевич

N1 - The BESIII Collaboration thanks the staff of BEPCII 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. 2020YFA0406400, No. 2020YFA0406300; National Natural Science Foundation of China (NSFC) under Contracts No. 12305089, No. 12375092, No. 11635010, No. 11735014, 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; the Chinese Academy of Sciences (CAS) Large-Scale Scientific Facility Program; the CAS Center for Excellence in Particle Physics (CCEPP); Joint Large-Scale Scientific Facility Funds of the NSFC and CAS under Contracts No. U1932102, No. U1832207; 100 Talents Program of CAS; Jiangsu Funding Program for Excellent Postdoctoral Talent under Contract No. 2023ZB833; project funded by China Postdoctoral Science Foundation under Contract No. 2023M732547; The Institute of Nuclear and Particle Physics (INPAC) and Shanghai Key Laboratory for Particle Physics and Cosmology; German Research Foundation DFG under Contracts No. 455635585, No. FOR5327, No. GRK 2149; Istituto Nazionale di Fisica Nucleare, Italy; 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; National Science Research and Innovation Fund (NSRF) via the Program Management Unit for Human Resources and Institutional Development, Research and Innovation of Thailand under Contract No. B16F640076; Polish National Science Centre under Contract No. 2019/35/O/ST2/02907; The Swedish Research Council; U.S. Department of Energy under Contract No. DE-FG02-05ER41374. Observation of D+→η′μ+νμ and First Experimental Study of D+→η′ℓ+νℓ Decay Dynamics / M. Ablikim, M. N. Achasov, P. Adlarson [et al.] // Physical Review Letters. – 2025. – Vol. 134, No. 11. – P. 111801. – DOI 10.1103/physrevlett.134.111801.

PY - 2025/3/18

Y1 - 2025/3/18

N2 - Using of collision data collected at the center-of-mass energy 3.773 GeV with the BESIII detector, we report the first observation of the semileptonic decay with significance of including systematic uncertainties, and an improved measurement of . The branching fractions of and are determined to be and , respectively. The ratio of the two branching fractions is determined to be ℛ휇/푒=1.07±0.1⁢9stat±0.0⁢3syst, which agrees with the theoretical expectation of lepton flavor universality within the standard model. From an analysis of the 퐷+→휂′⁢ℓ+⁢휈ℓ decay dynamics, the product of the hadronic form factor 푓휂′+⁡(0) and the Cabibbo-Kobayashi-Maskawa matrix element |푉푐⁢푑| is measured for the first time, giving 푓휂′+⁡(0)⁢|푉푐⁢푑|=(5.92±0.5⁢6stat±0.1⁢3syst)×10−2. The 휂 −휂′ mixing angle in the quark flavor basis is determined to be 휙P=(39.8±0.8stat±0.3syst)°.

AB - Using of collision data collected at the center-of-mass energy 3.773 GeV with the BESIII detector, we report the first observation of the semileptonic decay with significance of including systematic uncertainties, and an improved measurement of . The branching fractions of and are determined to be and , respectively. The ratio of the two branching fractions is determined to be ℛ휇/푒=1.07±0.1⁢9stat±0.0⁢3syst, which agrees with the theoretical expectation of lepton flavor universality within the standard model. From an analysis of the 퐷+→휂′⁢ℓ+⁢휈ℓ decay dynamics, the product of the hadronic form factor 푓휂′+⁡(0) and the Cabibbo-Kobayashi-Maskawa matrix element |푉푐⁢푑| is measured for the first time, giving 푓휂′+⁡(0)⁢|푉푐⁢푑|=(5.92±0.5⁢6stat±0.1⁢3syst)×10−2. The 휂 −휂′ mixing angle in the quark flavor basis is determined to be 휙P=(39.8±0.8stat±0.3syst)°.

UR - https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.134.111801

UR - https://www.scopus.com/record/display.uri?eid=2-s2.0-105000794759&origin=inward&txGid=7c2801d933f019e78212dd525f571e6d

UR - https://elibrary.ru/item.asp?id=81889233

U2 - 10.1103/PhysRevLett.134.111801

DO - 10.1103/PhysRevLett.134.111801

M3 - Article

C2 - 40192363

VL - 134

JO - Physical Review Letters

JF - Physical Review Letters

SN - 0031-9007

IS - 11

M1 - 111801

ER -