ATLAS diboson excesses from the stealth doublet model

Abstract

The ATLAS collaboration has reported excesses in diboson invariant mass searches of new resonances around 2 TeV, which might be a prediction of new physics around that mass range. We interpret these results in the context of a modified stealth doublet model where the extra Higgs doublet has a Yukawa interaction with the first generation quarks, and show that the heavy CP-even Higgs boson can naturally explain the excesses in the W W and ZZ channels with a small Yukawa coupling, ξ ∼ 0.15, and a tiny mixing angle with the SM Higgs boson, α ∼ 0.06. Furthermore, the model satisfy constraints from colliders and electroweak precision measurements.

Angular observables for spin discrimination in boosted diboson final states

“…Spin-0 explanations are discussed in context of a Higgs singlet [36], a two Higgs doublet model [37][38][39][40], sparticles [41,42] or composite scalars [43,44]. Spin-1 proposals include composite vector resonances [45][46][47][48][49][50][51][52], generic and effective field theory (EFT) models [53][54][55][56] as well as heavy W resonances [22][23][24][25][57][58][59][60][61][62][63][64][65][66][67][68][69], Z resonances [26,[70][71][72][73][74][75][76] or both [77][78][79]…”

The Diboson Excess: Experimental Situation and Classification of Explanations; A Les Houches Pre-Proceeding

“…There have been several attempts (e.g. [123][124][125]) to explain the observed diboson excess(es) as produced by ∼ 2 TeV scalars originating in an extended Higgs sector, like a Two Higgs Doublet Model (2HDM). Here we discuss the generic features of such scenarios, and give a detailed overview of the problems they face in explaining the diboson excess.…”

“…The rationale in Refs. [123][124][125] is that, as H 2 does not develop a vev, and thus does not contribute to the quark masses, the couplings of H 2 to the first generation of quarks may be large, e.g.…”

Noncommutative approach to disclose a Higgs group

“…CMS [8][9][10] and ATLAS [11] collaboration have reported several excesses ∼2 TeV in the dijet invariant mass spectrum of ∼20.3 f b −1 at √ s = 8TeV, for example: the ATLAS collaboration has reported that a 3.4σ, 2.6σ and 2.9σ deviation are observed ∼2 TeV in the invariant mass distribution of boosted WZ, WW and ZZ, where the global significance of the discrepancy in the WZ channel is 2.5σ; the CMS experiment reported a moderate excess, ∼1.4σ for the dijet resonances, where the W-and Z-tagged jets are indistinguishable; CMS experiment reported a ∼ 2σ excess at ∼1.8 TeV in the dijet resonance channel search. In this scenario, there are several papers [12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28] explaining this diboson excesses at 1.8 ∼2 TeV.…”