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Chinese Physics C> 2013, Vol. 37> Issue(7) : 073101 DOI: 10.1088/1674-1137/37/7/073101

Testing lepton flavor universality in terms of BESⅢ and charm-tau factory data

  • The recent measurements on RK and Rπ 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 μ-τ asymmetry, therefore the measurements on RD(Ds)eμ=Γ(D(Ds)→ e+νe)/Γ(D(Ds)→ μ+νμ) and RD(Ds)μτ=Γ(D(Ds)→ μ+νμ)/Γ(D(Ds)→ τ+ντ) (and for some other heavy mesons B± and Bc etc.) may shed more light on the physics responsible for the violation of the leptonic flavor universality. The data of BESⅢ are available to test the universality and that of future charm-tau factories will provide more accurate information. In this work, we will discuss RD(Ds)eμ and RD(Ds)μτ in detail and also briefly consider the cases for B± and Bc.
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WANG Bin, ZHAO Ming-Gang, SUN Ke-Sheng and LI Xue-Qian. Testing lepton flavor universality in terms of BESⅢ and charm-tau factory data[J]. Chinese Physics C, 2013, 37(7): 073101. doi: 10.1088/1674-1137/37/7/073101
WANG Bin, ZHAO Ming-Gang, SUN Ke-Sheng and LI Xue-Qian. Testing lepton flavor universality in terms of BESⅢ and charm-tau factory data[J]. Chinese Physics C, 2013, 37(7): 073101.  doi: 10.1088/1674-1137/37/7/073101 shu
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Received: 2013-04-07
Revised: 1900-01-01
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Testing lepton flavor universality in terms of BESⅢ and charm-tau factory data

    Corresponding author: WANG Bin,
    Corresponding author: ZHAO Ming-Gang,
    Corresponding author: SUN Ke-Sheng,
    Corresponding author: LI Xue-Qian,
  • Received Date: 2013-04-07
  • Accepted Date: 1900-01-01
  • Available Online: 2013-07-05

Abstract: The recent measurements on RK and Rπ 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 μ-τ asymmetry, therefore the measurements on RD(Ds)eμ=Γ(D(Ds)→ e+νe)/Γ(D(Ds)→ μ+νμ) and RD(Ds)μτ=Γ(D(Ds)→ μ+νμ)/Γ(D(Ds)→ τ+ντ) (and for some other heavy mesons B± and Bc etc.) may shed more light on the physics responsible for the violation of the leptonic flavor universality. The data of BESⅢ are available to test the universality and that of future charm-tau factories will provide more accurate information. In this work, we will discuss RD(Ds)eμ and RD(Ds)μτ in detail and also briefly consider the cases for B± and Bc.

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