  The W Mass determination at the Tevatron CDF experiment reported a deviation
from the SM expectation at 7$\sigma$ level. We discuss a few possible
interpretations and their collider implications. We perform electroweak global
fits under various frameworks and assumptions. We consider three types of
electroweak global fits in the effective-field-theory framework: the $S$-$T$,
the $S$-$T$-$\delta G_F$, and the eight-parameter flavor-universal one. We
discuss the amounts of tensions between different $m_W$ measurements reflected
in these fits and the corresponding shifts in central values of these
parameters. With these electroweak fit pictures in hand, we present a few
different classes of models and discuss their compatibility with these results.
We find that while explaining the $m_W$ discrepancy, the single gauge boson
extensions face strong LHC direct search constraints unless the $Z'$ is
fermiophobic (leptophobic) which can be realized if extra vector fermions
(leptons) mix with the SM fermions (leptons). Vector-like top partners can
partially generate the needed shift to the electroweak observables. The
compatibility with top squark is also studied in detail. We find non-degenerate
top squark soft masses enhance the needed operator coefficients, enabling an
allowed explanation compatible with current LHC measurements. Overall, more
theory and experimental developments are highly in demand to reveal the physics
behind this discrepancy.
