Testing ATLAS diboson excess with dark matter searches at LHC

Abstract:We construct an SU(2) L × SU(2) R × U(1) B−L model with a Higgs sector that consists of a bidoublet and a doublet, and with a right-handed neutrino sector that includes one Dirac fermion and one Majorana fermion. This model explains the Run 1 CMS and ATLAS excess events in the e + e − jj, jj, W h 0 and W Z channels in terms of a W boson of mass near 1.9 TeV and of coupling g R in the 0.4-0.5 range, with the lower half preferred by limits on tb resonances and Run 2 results. The production cross section of this W boson at the 13 TeV LHC is in the 700-900 fb range, allowing sensitivity in more than 17 final states. We determine that the Z boson has a mass in the 3.4-4.5 TeV range and several decay channels that can be probed in Run 2 of the LHC, including cascade decays via heavy Higgs bosons.

Section: Similarly Contributions To What Appear To Bementioning

confidence: 99%

Signals of a 2 TeV W′ boson and a heavier Z′ boson

Dobrescu

Fox

2016

“…As discussed above, our model may predict a relatively light Z R , which may also be reached at the LHC. In addition, a (fat) jet plus missing energy search can also probe this model [154], which would constrain the decay mode W Z → ννjj.…”

Section: Jhep02(2016)120mentioning

confidence: 99%

The ATLAS diboson resonance in non-supersymmetric SO(10)

Evans

Olive

Zheng

2016

SO(10) grand unification accommodates intermediate gauge symmetries with which gauge coupling unification can be realized without supersymmetry. In this paper, we discuss the possibility that a new massive gauge boson associated with an intermediate gauge symmetry explains the excess observed in the diboson resonance search recently reported by the ATLAS experiment. The model we find has two intermediate symmetries,where the latter gauge group is broken at the TeV scale. This model achieves gauge coupling unification with a unification scale sufficiently high to avoid proton decay. In addition, this model provides a good dark matter candidates, whose stability is guaranteed by a Z 2 symmetry present after the spontaneous breaking of the intermediate gauge symmetries. We also discuss prospects for testing these models in the forthcoming LHC experiments and dark matter detection experiments.

“…The deviation has been associated to possible signatures of various beyond-the-SM models, e.g. models with new W and Z vector bosons (see for example [35][36][37][38][39][40][41][42][43][44]), models involving new resonances with different spins (see for example [45][46][47][48][49][50][51][52]), composite and technicolor models (see for example [53][54][55][56][57][58]) and new and composite Higgs states (see for example [59][60][61][62][63][64][65][66][67]). A review of the different models offering an interpretation of the deviations reported in the ATLAS and CMS searches has been made in Ref.…”

Section: Introductionmentioning

confidence: 99%

Combination of Run-1 exotic searches in diboson final states at the LHC

Dias

Gadatsch

Gouzevich

et al. 2016

We perform a statistical combination of the ATLAS and CMS results for the search of a heavy resonance decaying to a pair of vector bosons with the √ s = 8 TeV datasets collected at the LHC. We take into account six searches in hadronic and semileptonic final states carried out by the two collaborations. We consider only public information provided by ATLAS and CMS in the HEPDATA database and in papers published in refereed journals. We interpret the combined results within the context of a few benchmark new physics models, such as models predicting the existence of a W or a bulk RandallSundrum spin-2 resonance, for which we present exclusion limits, significances, p-values and best-fit cross sections. A heavy diboson resonance with a production cross section of ∼4-5 fb and mass between 1.9 and 2.0 TeV is the exotic scenario most consistent with the experimental results. Models in which a heavy resonance decays preferentially to a WW final state are disfavoured.