Constraining the Little Higgs model of Schmaltz, Stolarski, and Thaler with recent results from the LHC

Abstract

In this paper, we use the latest Higgs measurements from ATLAS and CMS to constrain the parameter space of the model of Schmaltz, Stolarski and Thaler, a Little Higgs model with two Higgs doublets, which we will refer to as the BLH model. We account for all production and decay modes explored at ATLAS and CMS in two scenarios: a general case, which assumes the $h_0$ state is light ($m_{h_0}\approx 125$ GeV) and the masses of the other neutral scalars ($H_0$ and $A_0$) are allowed to vary, and a case with a near-degeneracy between the masses of the $h_0$ and $A_0$ and, for some choices of parameters, the $H_0$ states. The near-degeneracy scenario can result in an enhanced diphoton rate, as measured by ATLAS, but is largely ruled out by a combination of the $h_0\to {\tau }^{+}{\tau }^{-}$ and the heavy $H_0\to W^{+}{W}^{-}$ measurements. In the general case, we find large regions of parameter space that are in better agreement with either the ATLAS or CMS results than is the SM. However, a significantly enhanced diphoton rate is only possible through large contributions to the $h_0\gamma \gamma$ effective coupling from charged Higgs bosons in a region of parameter space that borders on violation of perturbativity in the scalar sector.

27 pages, 26 figures

References in corpus (8)

• Observation of a new particle in the search for the Standard Model Higgs boson with the ATLAS detector at the LHC
• Observation of a new boson at a mass of 125 GeV with the CMS experiment at the LHC
• Inclusive search for a vector-like T quark with charge 2/3 in pp collisions at sqrt(s) = 8 TeV
• Mass-degenerate Higgs bosons at 125 GeV in the Two-Higgs-Doublet Model
• Can the 125 GeV Higgs be the Little Higgs?
• Littlest Higgs with T-parity: Status and Prospects
• Little Higgs theory confronted with the LHC Higgs data
• Dark matter in little Higgs model under current experimental constraints from LHC, Planck and Xenon

Cited by in corpus (4)

• $H\to \ell {\ell }^{\prime }$ in the Simplest Little Higgs Model
• Status and Prospects of the Two-Higgs-Doublet SU(6)/Sp(6) little-Higgs Model and the Alignment Limit
• Lepton Flavour Violation in Hadron Decays of the Tau Lepton in the Simplest Little Higgs Model
• Research on the electromagnetic and weak dipole moments of the tau-lepton at the Bestest Little Higgs Model