Analysis of W± + 4γ in the 2HDM Type-I at the LHC

Abstract

We analyse a light charged Higgs boson in the 2-Higgs Doublet Model (2HDM) Type-I, when its mass satisfies the condition MH±< Mt + Mb and the parameter space is consistent with theoretical requirements of self-consistency as well as the latest experimental constraints from Large Hadron Collider (LHC) and other data. Over such a parameter space, wherein the Standard Model (SM)-like state discovered at the LHC in 2012 is the heaviest CP-even state of the 2HDM, it is found that the decay modes of the charged Higgs boson are dominated by H±→ W±(∗)h. Furthermore, the light neutral Higgs boson h dominantly decays into two photons. Under these conditions, we find that the production and decay process pp → H±h → W±(∗)hh → ℓνℓ + 4γ (ℓ = e, μ) is essentially background free. However, since the W±(∗) could be largely off-shell and the h state is very light, so that both the lepton coming from the former and the photons coming from the latter could be rather soft, we perform here a full Monte Carlo (MC) analysis at the detector level demonstrating that such a W± + 4γ signal is very promising, as it would be yielding significant excesses at the LHC with an integrated luminosity of L = 300 fb−1 at both $$ \sqrt{s} $$ s = 13 and 14 TeV.

Discovery prospects of a light charged Higgs near the fermiophobic region of Type-I 2HDM

“…Our analysis therefore serves as a complementary probe to the analysis in ref. [10,20] which can also be seen from the right panel of figure 1.…”

“…In this limit, the analysis of hh → 4γ has been performed in ref. [10,19,20]. However the branching ratio to diphoton falls off very sharply away from the fermiophobic regions (see figure 1).…”

“…Such a light Higgs can decay to a pair of quarks or a pair of photons. The phenomenology of charged Higgs in Type-I 2HDM with both the light Higgses decaying to pair of photons near the fermiophobic regions (resulting in 4γ) has been extensively studied in the literature [10,[18][19][20]. However, as can be seen from figure 1, even a 1% deviation from fermiophobic limit (α = π/2) makes the light Higgs decay fraction into fermions larger than the di-gamma mode.…”

Searching for $H^\pm\to W^{\pm} + 4γ$ signals in the 2HDM Type-I at the LHC

“…In this note, we focus on H ± → W ± + 4γ signals in the 2HDM Type-I possibly emerging at the LHC from H ± h production and decay, wherein both h → γγ [2]. We assume that the heavy scalar H is the observed CP-even SM-like Higgs boson, which properties are consistent with the LHC measurements, and h is lighter than 125 GeV.…”

Same sign trilepton as signature of charged Higgs in two Higgs doublet model

“…On the other hand, the electroweak production of H ± [32][33][34][35][36] in association with a neutral (pseudo)scalar depends on the gauge coupling and dominates over the top associated production at large tan β. For type-I 2HDM, the electroweak production of a light charged Higgs can give rise to multi-photon or multi-boson final state [37][38][39][40][41][42][43]. However, if the BSM scalars in type-I 2HDM are heavier than the observed Higgs boson, they dominantly decay to a pair of heavy gauge bosons.…”