Author:
Gu Jiayin,Liu Zhen,Ma Teng,Shu Jing
Abstract
Abstract
The W mass determination at the Tevatron CDF experiment reported a deviation from the SM expectation at the 7σ 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, S-T-
, and eight-parameter flavor-universal one. We discuss the amounts of tensions between different
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
discrepancy, the single gauge boson extensions face strong LHC direct search constraints unless the
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 the top squark is also studied in detail. We find that the non-degenerate top squark soft masses enhance the needed operator coefficients, enabling an allowed explanation compatible with current LHC measurements. Overall, more theoretical and experimental developments are highly in demand to reveal the physics behind this discrepancy.
Funder
Strategic Priority Research Program and Key Research Program of Frontier Science of the Chinese Academy of Sciences
U.S. Department of Energy
National Natural Science Foundation of China
"Study in Israel" Fellowship for Outstanding Post-Doctoral Researchers from China and India by PBC of CHE
CAS project for Young Scientists in Basic Research
Subject
Astronomy and Astrophysics,Instrumentation,Nuclear and High Energy Physics
Cited by
16 articles.
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