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Study of $\Lambda_c^+\rightarrow \Lambda \mu^+\nu_{\mu}$ and Test of Lepton Flavor Universality with $\Lambda_c^+\rightarrow \Lambda \ell^+\nu_{\ell}$ Decays

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

Study of $\Lambda_c^+\rightarrow \Lambda \mu^+\nu_{\mu}$ and Test of Lepton Flavor Universality with $\Lambda_c^+\rightarrow \Lambda \ell^+\nu_{\ell}$ Decays

Abstract

The measurement of the Cabibbo-favored semileptonic decay $\Lambda_c^+\rightarrow \Lambda \mu^+\nu_{\mu}$ is reported using $4.5~\mathrm{fb}^{-1}$ of $e^+e^-$ annihilation data collected at center-of-mass energies ranging from 4.600~GeV to 4.699~GeV. The branching fraction of the decay is measured to be $\mathcal{B}(\Lambda_c^+\rightarrow \Lambda \mu^+\nu_{\mu})=(3.48\pm0.14_{\rm stat.}\pm0.10_{\rm syst.})\%$, three times more precise than the prior world average result. Tests of lepton flavor universality using $\Lambda_c^+\rightarrow \Lambda \ell^+\nu_{\ell}$ ($\ell=e, \mu$) decays are reported for the first time, based on measurements of the differential decay rates and the forward-backward asymmetries in separate four-momentum transfer regions. The results are compatible with Standard Model predictions. Furthermore, we improve the determination of the form-factor parameters in $\Lambda_c^+\rightarrow \Lambda \ell^+\nu_{\ell}$ decays, which provide stringent tests and calibration for lattice quantum chromodynamics (LQCD) calculations.

Comment: 11 pages, 5 figures

Keywords

High Energy Physics - Experiment

81 references, page 1 of 9

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J. X. Zhang39,j,k, J. Y. Zhang1, J. Z. Zhang1,63, Jianyu Zhang63, Jiawei Zhang1,63, L. M. Zhang61, L. Q. Zhang59,

Lei Zhang43, P. Zhang1, Q. Y. Zhang40,81, Shuihan Zhang1,63, Shulei Zhang26,h, X. D. Zhang46, X. M. Zhang1,

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(B)INFN Sezione di Perugia, I-06100, Perugia, Italy; (C)University of Perugia, I-06100, Perugia, Italy 30 INFN Sezione di Ferrara, (A)INFN Sezione di Ferrara, I-44122,

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    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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