Abstract
The exotic decay modes of non-Standard Model (SM) Higgses in models with extended Higgs sectors have the potential to serve as powerful search channels to explore the space of Two-Higgs Doublet Models (2HDMs). Once kinematically allowed, heavy Higgses could decay into pairs of light non-SM Higgses, or a non-SM Higgs and a SM gauge boson, with branching fractions that quickly dominate those of the conventional decay modes to SM particles. In this study, we focus on the prospects of probing Type-II 2HDMs at the LHC and a future 100 TeV pp collider via exotic decay channels. We study the three prominent exotic decay channels: A → HZ, A → H±W∓ and H± → HW±, and find that a 100-TeV pp collider can probe most of the region of the Type-II 2HDM parameter space that survives current theoretical and experimental constraints with sizable exotic decay branching fraction through these channels, making them complementary to the conventional decay channels for heavy non-SM Higgses.
Highlights
We study the three prominent exotic decay channels: A → HZ, A → H±W ∓ and H± → HW ±, and find that a 100-TeV pp collider can probe most of the region of the Type-II 2HDM parameter space that survives current theoretical and experimental constraints with sizable exotic decay branching fraction through these channels, making them complementary to the conventional decay channels for heavy non-Standard Model (SM) Higgses
The reach at the 14 TeV Large Hadron Collider (LHC) [10] for this channel is limited by the low production cross section of heavy charged Higgs bosons, and we only show the reach for a 100 TeV pp collider, which will be able to produce charged Higgses with TeV-scale masses in large numbers
While most direct searches for an BSM Higgs sector focus on the conventional decays of the corresponding Higgs bosons, additional exotic decays of these states can arise if the BSM Higgs sector is hierarchical
Summary
We provide a brief review of the aspects of 2HDMs that are most relevant to this study. After the mechanism of electroweak symmetry breaking (EWSB), the scalar sector of a 2HDM consists of five mass eigenstates: a pair of neutral CP-even Higgses, h and H, a CP-odd Higgs, A, and a pair of charged Higgses H± For these states we can write h = −sα φ1 + cα φ2, H = cα φ1 + sα φ2,. It is convenient to parameterize 2HDMs by the physical Higgs masses, mh, mH , mA and mH±, the mixing angle between the two CP-even Higgses α, tan β, the electroweak VEV v, and the soft Z2 symmetry breaking parameter m212 Two of these parameters, namely the vacuum expectation value v and the mass of the SM-like Higgs, mh are known to be 246 GeV and 125 GeV respectively, leaving the remaining six independent parameters. In this work we will focus on Type-II 2HDMs, in which the up-type quarks only couple to Φ2, and the down-type quarks and leptons only couple to Φ1
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
