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Testing lepton flavor universality in terms of data of BES III and charm-tau factory
High Energy Physics - Phenomenology · Submitted 4 Apr 2013
abstract compiled · 2026-09-23 · no language-model review
The authors' main claim It is suggested that a mixing between sterile and active neutrinos might induce such a violation.
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The abstract, sentence by sentence
The recent measurements on $R_K$ and $R_{\pi}$ imply that there exists a possible violation of the leptonic flavor universality which is one of the cornerstones of the standard model. It is suggested that a mixing between sterile and active neutrinos might induce such a violation. In this work we consider the scenarios with one or two sterile neutrinos to explicitly realize the data while the constraints from the available experiments have been taken into account. Moreover, as indicated in literature, the deviation of the real PMNS matrix from the symmetric patterns may be due to a $\mu-\tau$ asymmetry, therefore the measurements on $R_{D(D_s)e\mu} = \Gamma(D(D_s)\rightarrow e^+\nu_e)/\Gamma(D(D_s)\rightarrow \mu^+\nu_\mu)$ and $R_{D(D_s)\mu\tau} = \Gamma(D(D_s)\rightarrow \mu^+\nu_\mu)/\Gamma(D(D_s)\rightarrow \mu^+\tau_\tau)$ (and for some other heavy mesons $B^{\pm}$ and $B_c$ etc.) may shed more light on physics responsible for the violation of the leptonic flavor universality. The data of BES III are available to test the universality and that of the future charm-tau factory will provide more accurate information towards the aspect, in this work, we will discuss $R_{D(D_s)e\mu}$ and $R_{D(D_s)\mu\tau}$ in all details and also briefly consider the cases for $B^{\pm}$ and $B_c$.
background contribution method result interpretation main claim
| # | sentence | role | the authors' own work | states the main conclusion | strength |
|---|---|---|---|---|---|
| s0 | The recent measurements on $R_K$ and $R_{\pi}$ imply that there exists a possible violation of the leptonic flavor universality which is one of the cornerstones of the standard model. | background 1.00 | 0.04 | 0.07 | hedged possibility 0.99 |
| s1 | It is suggested that a mixing between sterile and active neutrinos might induce such a violation. | background 0.94 | 0.06 | 0.05 | speculative 0.52 |
| s2 | In this work we consider the scenarios with one or two sterile neutrinos to explicitly realize the data while the constraints from the available experiments have been taken into account. | contribution 0.77 | 0.64 | 0.06 | asserted 0.84 |
| s3 | Moreover, as indicated in literature, the deviation of the real PMNS matrix from the symmetric patterns may be due to a $\mu-\tau$ asymmetry, therefore the measurements on $R_{D(D_s)e\mu} = \Gamma(D(D_s)\rightarrow e^+\nu_e)/\Gamma(D(D_s)\rightarrow \mu^+\nu_\mu)$ and $R_{D(D_s)\mu\tau} = \Gamma(D(D_s)\rightarrow \mu^+\nu_\mu)/\Gamma(D(D_s)\rightarrow \mu^+\tau_\tau)$ (and for some other heavy mesons $B^{\pm}$ and $B_c$ etc.) may shed more light on physics responsible for the violation of the leptonic flavor universality. | background 0.86 | 0.05 | 0.07 | hedged possibility 0.99 |
| s4 | The data of BES III are available to test the universality and that of the future charm-tau factory will provide more accurate information towards the aspect, in this work, we will discuss $R_{D(D_s)e\mu}$ and $R_{D(D_s)\mu\tau}$ in all details and also briefly consider the cases for $B^{\pm}$ and $B_c$. | contribution 0.95 | 0.38 | 0.10 | asserted 0.84 |
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The paper
Original abstract
The recent measurements on $R_K$ and $R_{\pi}$ imply that there exists a possible violation of the leptonic flavor universality which is one of the cornerstones of the standard model. It is suggested that a mixing between sterile and active neutrinos might induce such a violation. In this work we consider the scenarios with one or two sterile neutrinos to explicitly realize the data while the constraints from the available experiments have been taken into account. Moreover, as indicated in literature, the deviation of the real PMNS matrix from the symmetric patterns may be due to a $\mu-\tau$ asymmetry, therefore the measurements on $R_{D(D_s)e\mu} = \Gamma(D(D_s)\rightarrow e^+\nu_e)/\Gamma(D(D_s)\rightarrow \mu^+\nu_\mu)$ and $R_{D(D_s)\mu\tau} = \Gamma(D(D_s)\rightarrow \mu^+\nu_\mu)/\Gamma(D(D_s)\rightarrow \mu^+\tau_\tau)$ (and for some other heavy mesons $B^{\pm}$ and $B_c$ etc.) may shed more light on physics responsible for the violation of the leptonic flavor universality. The data of BES III are available to test the universality and that of the future charm-tau factory will provide more accurate information towards the aspect, in this work, we will discuss $R_{D(D_s)e\mu}$ and $R_{D(D_s)\mu\tau}$ in all details and also briefly consider the cases for $B^{\pm}$ and $B_c$.
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What it cites · 5 sentences without a confident label
Uses data or values from 4 papers
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A preliminary result about sum $∑_i=1^3|U_ei|=0.994±0.005$ at $90%$ confidence level [ref] , which signifies the non-unitarity of the $3×3$ active neutrino mixing matrix to be at level $≤𝒪(10^-2)$ [ref] .
Towards testing the unitarity of the 3X3 lepton flavor mixing matrix in a precision reactor antineutrino oscillation experiment · Constraints set by the FCNC · 0.84
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Indeed, the experimental results of NA62 Collaboration [ref] determine $Δr_Keμ=(4±4)×10^-3$ and $Δr_πeμ=(-4±3)×10^-3$ [ref] whereas the BES data tell us $Δr_D_sμτ=0.256^+0.430_-0.317$ which is rather large.
Kaon programme at CERN: recent results · Introduction · 0.94
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Indeed, the experimental results of NA62 Collaboration [ref] determine $Δr_Keμ=(4±4)×10^-3$ and $Δr_πeμ=(-4±3)×10^-3$ [ref] whereas the BES data tell us $Δr_D_sμτ=0.256^+0.430_-0.317$ which is rather large.
Tree-level lepton universality violation in the presence of sterile neutrinos: impact for $R_K$ and $R_\pi$ · Introduction · 0.94
Cites as background 1 paper
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Usually it is believed that the $μ-τ$ symmetry [ref] holds at high-energy scales, but breaks during the evolution to low-energy, so that the $3×3$ PMNS mixing matrix for active neutrinos deviates from the original symmetric textures.
$\theta_{13}$, $\mu\tau$ symmetry breaking and neutrino Yukawa textures · Discussions and conclusions · 0.94
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