Flavor non-universal gauge interactions and anomalies in B-meson decays

  • Motivated by flavor non-universality and anomalies in semi-leptonic B-meson decays, we present a general and systematic discussion about how to construct anomaly-free U(1)' gauge theories based on an extended standard model with only three right-handed neutrinos. If all standard model fermions are vector-like under this new gauge symmetry, the most general family non-universal charge assignments, (a,b,c) for three-generation quarks and (d,e,f) for leptons, need satisfy just one condition to be anomaly-free, 3 (a+b+c)=-(d+e+f). Any assignment can be linear combinations of five independent anomaly-free solutions. We also illustrate how such models can generally lead to flavor-changing interactions and easily resolve the anomalies in B-meson decays. Probes with Bs-Bs mixing, decay into τ±, dilepton and dijet searches at colliders are also discussed.
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Yong Tang and Yue-Liang Wu. Flavor non-universal gauge interactions and anomalies in B-meson decays[J]. Chinese Physics C, 2018, 42(3): 033104. doi: 10.1088/1674-1137/42/3/033104
Yong Tang and Yue-Liang Wu. Flavor non-universal gauge interactions and anomalies in B-meson decays[J]. Chinese Physics C, 2018, 42(3): 033104.  doi: 10.1088/1674-1137/42/3/033104 shu
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Received: 2017-12-19
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    Supported by the Grant-in-Aid for Innovative Areas (16H06490)

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Flavor non-universal gauge interactions and anomalies in B-meson decays

  • 1.  Department of Physics, Faculty of Science, The University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan
  • 2. International Centre for Theoretical Physics Asia-Paciflc, Beijing, China
  • 3. Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing 100190, China
  • 4. University of Chinese Academy of Sciences, Beijing 100049, China
Fund Project:  Supported by the Grant-in-Aid for Innovative Areas (16H06490)

Abstract: Motivated by flavor non-universality and anomalies in semi-leptonic B-meson decays, we present a general and systematic discussion about how to construct anomaly-free U(1)' gauge theories based on an extended standard model with only three right-handed neutrinos. If all standard model fermions are vector-like under this new gauge symmetry, the most general family non-universal charge assignments, (a,b,c) for three-generation quarks and (d,e,f) for leptons, need satisfy just one condition to be anomaly-free, 3 (a+b+c)=-(d+e+f). Any assignment can be linear combinations of five independent anomaly-free solutions. We also illustrate how such models can generally lead to flavor-changing interactions and easily resolve the anomalies in B-meson decays. Probes with Bs-Bs mixing, decay into τ±, dilepton and dijet searches at colliders are also discussed.

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