Extra $W$-Boson Mass from a D3-Brane

Abstract

Motivated by the recent CDF measurement of the $W$-boson mass, we study string-based particle physics models which can accommodate this deviation from the Standard Model. We consider an F-theory GUT in which the visible sector is realized on intersecting 7-branes, and extra sector states arise from a probe D3-brane near an E-type Yukawa point. The D3-brane worldvolume naturally realizes a strongly coupled sector which mixes with the Higgs. In the limit where some extra sector states get their mass solely from Higgs vevs, this leads to a contribution to the $\rho$ parameter which is too large, but as the D3-brane is separated from the 7-brane stack, this effect is suppressed, leading to O(1) - O(10) TeV scale extra sector states and a correction to $\rho$ which would be in accord with the CDF result. We also estimate the contribution to the oblique electroweak parameter $S$, and find that it is compatible with existing constraints. This also leads to additional signatures, including diphoton resonances (as well as other diboson final states) in the O(1) - O(10) TeV range.

v2: 12 pages, 2 figures, typos corrected, references added, clarifications added

References in corpus (4)

• Electroweak Precision Tests of the Standard Model after the Discovery of the Higgs Boson
• An Exceptional Sector for F-theory GUTs
• Kinetic Mixing at Strong Coupling
• Statistical coupling constants from hidden sector entanglement

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