Speaker
Description
The CDF-II collaboration’s recent high-precision measurement of $W$ boson mass, $M_{W}^{\text{CDF}}$ = 80.4335 $\pm$ 0.0094 GeV, indicates $7-\sigma$ deviation from the SM expectation $M_{W} = 80.354 \pm 0.007$ GeV. This leads us to investigate the extension of SM, which can account for aforementioned problems with SM. We investigate the possibility of the well-known canonical Scotogenic model, where dark matter particle running in the loop generates neutrino masses, to explain the CDF-II measurement. For both scalar and fermionic dark matter possibilities, we simultaneously examine the constraints coming from a) neutrino mass, oscillation, neutrinoless double beta decay and lepton flavour violation experiments, b) from dark matter relic density and direct detection experiments c) from the oblique $S$, $T$, $U$ parameter values consistent with CDF-II W boson measurement. We show that the viable parameter space of doublet scalar carrying a dark parity charge is nearly ruled out by the new CDF-II measurement while the fermionic dark matter in the canonical Scotogenic model can simultaneously explain all the aforementioned issues.
In our second work, we focused on $U(1)_{B-L}$ gauged SM extension. We demonstrate that $B-L$ extended models can explain the revised best fit values for $S$, $T$, and $U$ following the CDF II results. We studied the parameter space of models with and without mixing between neutral gauge bosons. We also reviewed the dark matter constraints and demonstrated that there are parameter space which is compatible with current W boson mass, relic abundance, and direct detection experiments.
| Session | Beyond the Standard Model |
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