Analysis of W± + 4γ in the 2HDM Type-I at the LHC
Yan Wang, Abdesslam Arhrib, Rachid Benbrik, Mohamed Krab, B. Manaut, Stefano Moretti, Qi-Shu Yan
Abstract
A bstract We analyse a light charged Higgs boson in the 2-Higgs Doublet Model (2HDM) Type-I, when its mass satisfies the condition M H± < M t + M b 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 → ℓν ℓ + 4 γ ( 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 ± + 4 γ 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 $$ \sqrt{s} $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msqrt> <mml:mi>s</mml:mi> </mml:msqrt> </mml:math> = 13 and 14 TeV.