Observation of D s + → η ′ μ + ν μ , Precision Test of Lepton Flavor Universality with D s + → η ( ′ ) l + ν l , and First Measurements of D s + → η ( ′ ) μ + ν μ Decay Dynamics

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doi:10.1103/PhysRevLett.132.091802

Observation of $D_{s}^{+} \to η^{'} μ^{+} ν_{μ}$ , Precision Test of Lepton Flavor Universality with $D_{s}^{+} \to η^{(')} l^{+} ν_{l}$ , and First Measurements of $D_{s}^{+} \to η^{(')} μ^{+} ν_{μ}$ Decay Dynamics

Journal Article · Tue Feb 27 23:00:00 EST 2024 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.132.091802· OSTI ID:2315749

Ablikim, M.; Achasov, M. N.; Adlarson, P.; Aliberti, R.; Amoroso, A.; An, M. R.; An, Q.; Bai, Y.; Bakina, O.; Balossino, I.; Ban, Y.; Batozskaya, V.; Begzsuren, K.; Berger, N.; Berlowski, M.; Bertani, M.; Bettoni, D.; Bianchi, F.; Bianco, E.; Bloms, J. more »

By analyzing $7.33 {fb}^{- 1}$ of $e^{+} e^{-}$ annihilation data collected at center-of-mass energies between 4.128 and 4.226 GeV with the BESIII detector, we report the observation of the semileptonic decay $D_{s}^{+} \to η^{'} μ^{+} ν_{μ}$ , with a statistical significance larger than $10 σ$ , and the measurements of the $D_{s}^{+} \to η μ^{+} ν_{μ}$ and $D_{s}^{+} \to η^{'} μ^{+} ν_{μ}$ decay dynamics for the first time. The branching fractions of $D_{s}^{+} \to η μ^{+} ν_{μ}$ and $D_{s}^{+} \to η^{'} μ^{+} ν_{μ}$ are determined to be $(2.235 \pm 0.05 1_{stat} \pm 0.05 2_{syst}) %$ and $(0.801 \pm 0.05 5_{stat} \pm 0.02 8_{syst}) %$ , respectively, with precision improved by factors of 6.0 and 6.6 compared to the previous best measurements. Combined with the results for the decays $D_{s}^{+} \to η e^{+} ν_{e}$ and $D_{s}^{+} \to η^{'} e^{+} ν_{e}$ , the ratios of the decay widths are examined both inclusively and in several $ℓ^{+} ν_{ℓ}$ four-momentum transfer ranges. No evidence for lepton flavor universality violation is found within the current statistics. The products of the hadronic form factors $f_{+, 0}^{η^{(')}} (0)$ and the $c \to s$ Cabibbo-Kobayashi-Maskawa matrix element $| V_{c s} |$ are determined. The results based on the two-parameter series expansion are $f_{+, 0}^{η} (0) | V_{c s} | = 0.452 \pm 0.01 0_{stat} \pm 0.00 7_{syst}$ and $f_{+, 0}^{η^{'}} (0) | V_{c s} | = 0.504 \pm 0.03 7_{stat} \pm 0.01 2_{syst}$ , which help to constrain present models on $f_{+, 0}^{η^{(')}} (0)$ . The forward-backward asymmetries are determined to be $⟨ A_{FB}^{η} ⟩ = - 0.059 \pm 0.03 1_{stat} \pm 0.00 5_{syst}$ and $⟨ A_{FB}^{η^{'}} ⟩ = - 0.064 \pm 0.07 9_{stat} \pm 0.00 6_{syst}$ for the first time, which are consistent with the theoretical calculation.

Published by the American Physical Society 2024

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Sponsoring Organization:: USDOE

Grant/Contract Number:: FG02-05ER41374

OSTI ID:: 2315749

Alternate ID(s):: OSTI ID: 2579664

Journal Information:: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 9 Vol. 132; ISSN 0031-9007; ISSN PRLTAO

Publisher:: American Physical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Explaining h → μ ± τ ∓ , B → K * μ + μ − , and B → K μ + μ − / B → K e + e − in a Two-Higgs-Doublet Model with Gauged L μ − L τ Crivellin, Andreas; D’Ambrosio, Giancarlo; Heeck, Julian Physical Review Letters, Vol. 114, Issue 15 https://doi.org/10.1103/PhysRevLett.114.151801	journal	April 2015
Measurement of the Ratio of Branching Fractions B ( B ¯ 0 → D * + τ − ν ¯ τ ) / B ( B ¯ 0 → D * + μ − ν ¯ μ ) Aaij, R.; Adeva, B.; Adinolfi, M. Physical Review Letters, Vol. 115, Issue 11 https://doi.org/10.1103/PhysRevLett.115.111803	journal	September 2015
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Minimal Leptoquark Explanation for the R D ( * ) , R K , and ( g − 2 ) μ Anomalies Bauer, Martin; Neubert, Matthias Physical Review Letters, Vol. 116, Issue 14 https://doi.org/10.1103/PhysRevLett.116.141802	journal	April 2016
Measurement of B s 0 and D s − Meson Lifetimes Aaij, R.; Adeva, B.; Adinolfi, M. Physical Review Letters, Vol. 119, Issue 10 https://doi.org/10.1103/PhysRevLett.119.101801	journal	September 2017
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First Measurement of the Form Factors in D s + → K 0 e + ν e and D s + → K * 0 e + ν e Decays Ablikim, M.; Achasov, M. N.; Ahmed, S. Physical Review Letters, Vol. 122, Issue 6 https://doi.org/10.1103/PhysRevLett.122.061801	journal	February 2019
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Branching fractions of semileptonic D and $$D_s$$ D s decays from the covariant light-front quark model Cheng, Hai-Yang; Kang, Xian-Wei The European Physical Journal C, Vol. 77, Issue 9 https://doi.org/10.1140/epjc/s10052-017-5170-5	journal	September 2017
Erratum to: Branching fractions of semileptonic D and $$D_s$$ D s decays from the covariant light-front quark model Cheng, Hai-Yang; Kang, Xian-Wei The European Physical Journal C, Vol. 77, Issue 12 https://doi.org/10.1140/epjc/s10052-017-5423-3	journal	December 2017
$$\eta ^{(\prime )}$$-meson twist-2 distribution amplitude within QCD sum rule approach and its application to the semi-leptonic decay $$ D_s^+ \rightarrow \eta ^{(\prime )}\ell ^+ \nu _\ell $$ Hu, Dan-Dan; Fu, Hai-Bing; Zhong, Tao The European Physical Journal C, Vol. 82, Issue 1 https://doi.org/10.1140/epjc/s10052-021-09958-0	journal	January 2022
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Observation of $D_{s}^{+} \to η^{'} μ^{+} ν_{μ}$ , Precision Test of Lepton Flavor Universality with $D_{s}^{+} \to η^{(')} l^{+} ν_{l}$ , and First Measurements of $D_{s}^{+} \to η^{(')} μ^{+} ν_{μ}$ Decay Dynamics