Signatures of lower scale gauge coupling unification in the Standard Model due to extended Higgs sector

TL;DR

Extending the Standard Model with additional Higgs doublets can lead to gauge coupling unification at around 5 x 10^{13} GeV and predicts new scalar and vector bosons potentially observable at the LHC.

Contribution

The paper proposes a specific extension of the Standard Model's Higgs sector that achieves gauge coupling unification at a lower scale and predicts new particles accessible at current collider energies.

Findings

Unification scale around 5 x 10^{13} GeV.

Predicted new scalar and vector bosons near 700 GeV.

Potential visibility of these bosons in future LHC runs.

Abstract

The gauge coupling unification can be achieved at a unification scale around 5 x 10^{13} GeV if the Standard Model scalar sector is extended with extra Higgs-like doublets. The relevant new scalar degrees of freedom in the form of chiral Z* and W* vector bosons might "be visible" already at about 700 GeV. Their eventual preferred coupling to the heavy quarks explains the non observation of these bosons in the first LHC run and provides promising expectation for the second LHC run.