Understanding diboson anomalies

Abstract

We conduct a model-independent effective theory analysis of hypercharged fields with various spin structures towards understanding the diboson excess found in LHC run I, as well as possible future anomalies involving $WZ$ and $WH$ modes. Within the assumption of no additional physics beyond the standard model up to the scale of the possible diboson resonance, we show that a hypercharged scalar and a spin 2 particle do not have tree-level $WZ$ and $WH$ decay channels up to dimension 5 operators, and cannot therefore account for the anomaly, whereas a hypercharged vector is a viable candidate provided we also introduce a $Z^{\prime }$ in order to satisfy electroweak precision constraints. We calculate bounds on the $Z^{\prime }$ mass consistent with the Atlas/CMS diboson signals as well as electroweak precision data, taking into account both LHC run I and II data.

19 pages, 3 figures, updated in light of LHC run II results. To appear in Physical Review D

References in corpus (16)

• The global electroweak fit at NNLO and prospects for the LHC and ILC
• Search for high-mass dilepton resonances in pp collisions at sqrt(s) = 8 TeV with the ATLAS detector
• Search for physics beyond the standard model in dilepton mass spectra in proton-proton collisions at sqrt(s) = 8 TeV
• Search for massive resonances in dijet systems containing jets tagged as W or Z boson decays in pp collisions at sqrt(s) = 8 TeV
• Search for new particles in events with one lepton and missing transverse momentum in $pp$ collisions at $\sqrt{s}$ = 8 TeV with the ATLAS detector
• The Diphoton and Diboson Excesses in a Left-Right Symmetric Theory of Dark Matter
• Multiboson production in W' decays
• The ATLAS Di-boson Excess Could Be an R-parity Violating Di-smuon Excess
• The ATLAS Diboson Resonance in Non-Supersymmetric SO(10)
• The Diboson Excesses in an Anomaly Free Leptophobic Left-Right Model
• SO(10) grand unification in light of recent LHC searches and colored scalars at the TeV-scale
• Diboson anomaly: heavy Higgs resonance and QCD vector-like exotics
• Studies on Extended Higgs Sectors as a Probe of New Physics Beyond the Standard Model
• Alternative search strategies for a BSM resonance fitting ATLAS diboson excess
• Left-right non-linear dynamical Higgs
• Diboson excess and $Z^{\prime }$-predictions via left-right non-linear Higgs

Cited by in corpus (8)

• Probing the Higgs Sector of the Minimal Left-Right Symmetric Model at Future Hadron Colliders
• Multiboson production in W' decays
• The ATLAS Diboson Resonance in Non-Supersymmetric SO(10)
• The Diboson Excess: Experimental Situation and Classification of Explanations; A Les Houches Pre-Proceeding
• Diboson excess and $Z^{\prime }$-predictions via left-right non-linear Higgs
• Angular observables for spin discrimination in boosted diboson final states
• Diboson resonances within a custodially protected warped extra-dimensional scenario
• A model for the LHC diboson excess