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A proposal on complementary determination of the effective electro-weak mixing angles via doubly heavy-flavored hadron production at a super Z-factory

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Abstract

To test the standard model (SM) precisely and to look for the clues deviating from SM, a proposal for determining the effective electro-weak mixing angles sin2 θfeff (particularly f = lept, c, b) is proposed. It is via observing the asymmetries (the forward-backward one AFB, the left-right one ALR and the combined left-right forward-backward one AFBLR ) of the doubly heavy-flavored hadrons in the production at a super Z-factory (an e+e− collider designed with a luminosity as high as possible for modern-day techniques runs around the center-of-mass energy \(\sqrt s = {m_Z}\)). To see the sensitivity, uncertainties as well as the event accumulation precisely, the observables for describing the asymmetries of the produced hadrons are computed numerically with varying effective mixing angles, and based on the result analyses, it is concluded that the proposal may offer an independent complement determination of the effective mixing angles.

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Authors and Affiliations

  1. Key Laboratory of Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing, 100190, China

    Xu-Chang Zheng, Chao-Hsi Chang & Tai-Fu Feng

  2. School of Physical Sciences, University of Chinese Academy of Sciences, Beijing, 100049, China

    Xu-Chang Zheng & Chao-Hsi Chang

  3. Department of Physics, Chongqing University, Chongqing, 401331, China

    Xu-Chang Zheng

  4. China Center of Advanced Science and Technology (CCAST) (World Laboratory), Beijing, 100190, China

    Chao-Hsi Chang

  5. Department of Physics, Hebei University, Baoding, 071002, China

    Tai-Fu Feng

Authors
  1. Xu-Chang Zheng
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  2. Chao-Hsi Chang
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  3. Tai-Fu Feng
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Corresponding author

Correspondence to Chao-Hsi Chang.

Additional information

This work was supported by the National Natural Science Foundation of China (Grant Nos. 11275036, 11745006, 11535002, 11821505, 11675239, 11705045, 11821505, and 11805140), and the Key Research Program of Frontier Sciences, Chinese Academy of Sciences (Grant No. QYZDY-SSWSYS006).

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Zheng, XC., Chang, CH. & Feng, TF. A proposal on complementary determination of the effective electro-weak mixing angles via doubly heavy-flavored hadron production at a super Z-factory. Sci. China Phys. Mech. Astron. 63, 281011 (2020). https://doi.org/10.1007/s11433-019-1497-9

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  • DOI: https://doi.org/10.1007/s11433-019-1497-9

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