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Title: Muonic force behind flavor anomalies

Journal Article · · Journal of High Energy Physics (Online)
 [1];  [2];  [1];  [1];  [3]
  1. Univ. of Bern (Switzerland)
  2. Technion-Israel Institute of Technology, Haifa (Israel)
  3. Univ. of Cincinnati, OH (United States)

We develop an economical theoretical framework for combined explanations of the flavor physics anomalies involving muons: (g - 2)μ, RK(*), and b → sμ+μ- angular distributions and branching ratios, that was first initiated by some of us in ref. [1]. The Standard Model (SM) is supplemented with a lepton-flavored U(1)X gauge group. The U(1)X gauge boson with the mass of O(0.1) GeV resolves the (g - 2)μ tension. A TeV-scale leptoquark, charged under the U(1)X, carries a muon number and mediates B-decays without prompting charged lepton flavor violation or inducing proton decay. We explore the theory space of the chiral, anomaly-free U(1)X gauge extensions featuring the above scenario, and identify many suitable charge assignments for the SM+3νR fermion content with the integer charges in the range XFi $$\in$$ [-10, 10]. We then carry out a comprehensive phenomenological study of the muonic force in representative benchmark models. Interestingly, we found models which can resolve the tension without conflicting the complementary constraints, and all of the viable parameter space will be tested in future muonic resonance searches. Finally, the catalog of the anomaly-free lepton-non-universal charge assignments motivated us to explore different directions in model building. We present a model in which the muon mass and the (g - 2)μ are generated radiatively from a common short-distance dynamics after the U(1)X breaking. We also show how to charge a vector leptoquark under U(1)μ-τ in a complete gauge model.

Research Organization:
Univ. of Cincinnati, OH (United States)
Sponsoring Organization:
USDOE Office of Science (SC), High Energy Physics (HEP)
Grant/Contract Number:
SC0011784
OSTI ID:
1869406
Journal Information:
Journal of High Energy Physics (Online), Vol. 2022, Issue 4; ISSN 1029-8479
Publisher:
Springer NatureCopyright Statement
Country of Publication:
United States
Language:
English

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