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Observation of $D^+_s\to \eta^\prime \mu^+\nu_\mu$ and Measurements of $D^+_s\to \eta^{(\prime)}\mu^+\nu_\mu$ Decay Dynamics

Authors: BESIII Collaboration; Ablikim, M.; Achasov, M. N.; Adlarson, P.; Aliberti, R.; Amoroso, A.; An, M. R.; +193 Authors

Observation of $D^+_s\to \eta^\prime \mu^+\nu_\mu$ and Measurements of $D^+_s\to \eta^{(\prime)}\mu^+\nu_\mu$ Decay Dynamics

Abstract

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 $D^+_s\to \eta^\prime \mu^+\nu_\mu$ and studies of the $D_s^+ \to \eta\mu^+\nu_\mu$ and $D_s^+ \to \eta^\prime\mu^+\nu_\mu$ decay dynamics for the first time. The branching fractions of $D_s^+ \to \eta\mu^+\nu_\mu$ and $D_s^+ \to \eta^\prime\mu^+\nu_\mu$ are determined to be $(2.215\pm0.051_{\rm stat}\pm0.052_{\rm syst})\%$ and $(0.801\pm0.055_{\rm stat}\pm0.031_{\rm syst})\%$, respectively, with precision improved by factors of 5.9 and 6.5 compared to the previous best measurements. Combined with the results for the decays $D_s^+ \to \eta e^+\nu_e$ and $D_s^+ \to \eta^\prime e^+\nu_e$, the ratios of the decay widths are examined, both inclusively and in several $\mu^+\nu_\mu$ four-momentum transfer ranges. No evidence for lepton flavor universality violation is found within the current statistics. The products of the hadronic form factors $f_+^{\eta^{(\prime)}}(0)$ and the $c\to s$ Cabibbo-Kobayashi-Maskawa matrix element $|V_{cs}|$ are determined. The results based on the two-parameter series expansion are $f^{\eta}_+(0)|V_{cs}| = 0.451\pm0.010_{\rm stat}\pm0.008_{\rm syst}$ and $f^{\eta^{\prime}}_+(0)|V_{cs}| = 0.506\pm0.037_{\rm stat}\pm0.011_{\rm syst}$, which constrain present models on $f_{+}^{\eta^{(\prime)}}(0)$. The $\eta-\eta^\prime$ mixing angle in the quark flavor basis is determined to be $\phi_{\rm P} =(40.2\pm2.1_{\rm stat}\pm0.7_{\rm syst})^\circ$.

Keywords

High Energy Physics - Experiment

151 references, page 1 of 16

1 Institute of High Energy Physics, Beijing 100049, People's Republic of China

2 Beihang University, Beijing 100191, People's Republic of China

3 Beijing Institute of Petrochemical Technology, Beijing 102617, People's Republic of China

4 Bochum Ruhr-University, D-44780 Bochum, Germany

5 Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA

6 Central China Normal University, Wuhan 430079, People's Republic of China

7 Central South University, Changsha 410083, People's Republic of China

8 China Center of Advanced Science and Technology, Beijing 100190, People's Republic of China

9 China University of Geosciences, Wuhan 430074, People's Republic of China

10 Chung-Ang University, Seoul, 06974, Republic of Korea

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  • citations
    This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
    0
    popularity
    This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
    Average
    influence
    This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
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    impulse
    This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
    Average
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citations
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
0
Average
Average
Average
Funded by
EC| ONEDEGGAM
Project
ONEDEGGAM
The search for new physics through precision measurements of the CKM angle gamma
  • Funder: European Commission (EC)
  • Project Code: 758462
  • Funding stream: H2020 | ERC | ERC-STG
,
EC| Glueballs at BESIII
Project
Glueballs at BESIII
Search for the scalar glueball in a coupled channel amplitude analysis of J/psi decays with the BESIII experiment
  • Funder: European Commission (EC)
  • Project Code: 894790
  • Funding stream: H2020 | MSCA-IF-GF
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