4.4 Article

Frugal U(1)X models with non-minimal flavor violation for b → sll anomalies and neutrino mixing

Journal

JOURNAL OF HIGH ENERGY PHYSICS
Volume -, Issue 4, Pages -

Publisher

SPRINGER
DOI: 10.1007/JHEP04(2022)163

Keywords

Beyond Standard Model; Heavy Quark Physics; Gauge Symmetry; Neutrino Physics

Funding

  1. Department of Atomic Energy (DAE), Government of India [RTI4002]
  2. Department of Science and Technology [SB/S2/RJN-070]

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We analyze a class of models with an extra U(1)(X) gauge symmetry that explain the b -> sll anomalies and generate appropriate quark and neutrino mixing. These models, with specific constraints and parameter space, are consistent with the latest experimental data.
We analyze the class of models with an extra U(1)(X) gauge symmetry that can account for the b -> sll anomalies by modifying the Wilson coefficients C-9e and C-9 mu of the operators O-9l ((b) over bar gamma(mu)P(L)s)((l) over bar gamma(mu)l) from their standard model values. At the same time, these models generate appropriate quark mixing, and give rise to neutrino mixing via the Type-I seesaw mechanism. Apart from the gauge boson Z', these frugal models only have three right-handed neutrinos for the seesaw mechanism, an additional SU(2)(L) scalar doublet for quark mixing, and a SM-singlet scalar that breaks the U(1)(X) symmetry. This set-up identifies a class of leptonic symmetries, and necessitates non-zero but equal charges for the first two quark generations. If the quark mixing beyond the standard model were CKM-like, all these symmetries would be ruled out by the latest flavor constraints on Wilson coefficients and collider constraints on Z' parameters. However, we identify a single-parameter source of non-minimal flavor violation that allows a wider class of U(1)(X) symmetries to be compatible with all data. We show that the viable leptonic symmetries have to be of the form L-e +/- 3L(mu) - L-tau or L-e - 3L(mu) + L-tau, and determine the (M-Z',M-gZ') parameter space that may be probed by the high-luminosity data at the LHC.

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