W-boson mass anomaly from high-dimensional scalar multiplets

Abstract

In light of the recently discovered W-boson mass anomaly by the CDF Collaboration, we discuss two distinct mechanisms that could possibly explain this anomaly through the introduction of high-dimensional SU(2)L scalar multiplets. The first mechanism is the tree-level W-boson mass correction induced by the vacuum expectation values of one or more SU(2)L scalar multiplets with odd dimensions of n≥3 and zero hypercharge of Y=0 in order to avoid the strong constraint from measurements of the Z-boson mass. The second mechanism is to consider the one-loop level W-boson mass correction from a complex multiplet. In particular, we focus on the case with an additional scalar octuplet with Y=7/2. As a result, we find that both mechanisms can explain the W-boson mass anomaly without violating any other theoretical or experimental constraints.