Stringy origin of diboson and dijet excesses at the LHC

Abstract

Very recently, the ATLAS and CMS collaborations reported diboson and dijet excesses above standard model expectations in the invariant mass region of 1.8 -2.0 TeV. Interpreting the diboson excess of events in a model independent fashion suggests that the vector boson pair production searches are best described by WZ or ZZ topologies, because states decaying into W^+W^- pairs are strongly constrained by semileptonic searches. Under the assumption of a low string scale, we show that both the diboson and dijet excesses can be steered by an anomalous U(1) field with very small coupling to leptons. The Drell-Yan bounds are then readily avoided because of the leptophobic nature of the massive Z' gauge boson. The non-negligible decay into ZZ required to accommodate the data is a characteristic footprint of intersecting D-brane models, wherein the Landau-Yang theorem can be evaded by anomaly-induced operators involving a longitudinal Z. The model presented herein can be viewed purely field-theoretically, although it is particularly well motivated from string theory. Should the excesses become statistically significant at the LHC13, the associated Zγ topology would become a signature consistent only with a stringy origin.

References added. To be published in PLB

References in corpus (14)

• Four-dimensional String Compactifications with D-Branes, Orientifolds and Fluxes
• Search for high-mass dilepton resonances in pp collisions at sqrt(s) = 8 TeV with the ATLAS detector
• Search for new phenomena in the dijet mass distribution using $p-p$ collision data at $\sqrt{s}=8$ TeV with the ATLAS detector
• Search for resonances and quantum black holes using dijet mass spectra in proton-proton collisions at sqrt(s) = 8 TeV
• The LHC String Hunter's Companion
• Search for a new resonance decaying to a $W$ or $Z$ boson and a Higgs boson in the $\ell \ell /\ell \nu /\nu \nu +b\bar{b}$ final states with the ATLAS Detector
• Anomaly driven signatures of new invisible physics at the Large Hadron Collider
• Jet signals for low mass strings at the LHC
• Direct photons as probes of low mass strings at the LHC
• Stringy origin of Tevatron Wjj anomaly
• Probing the Green-Schwarz Mechanism at the Large Hadron Collider
• Stuckelberg Axions and the Effective Action of Anomalous Abelian Models 2. A SU(3)_C x SU(2)_W x U(1)_Y x U(1)_B model and its signature at the LHC
• Triboson interpretations of the ATLAS diboson excess
• String Resonances at Hadron Colliders

Cited by in corpus (27)

• New vector bosons and the diphoton excess
• Reconciling the 2 TeV Excesses at the LHC in a Linear Seesaw Left-Right Model
• 750 GeV diphotons from closed string states
• Stringy explanation of $b\to s{\ell }^{+}{\ell }^{-}$ anomalies
• Multiboson production in W' decays
• Composite spin-1 resonances at the LHC
• Diboson Excesses Demystified in Effective Field Theory Approach
• The ATLAS Di-boson Excess Could Be an R-parity Violating Di-smuon Excess
• Effective theory for neutral resonances and a statistical dissection of the ATLAS diboson excess
• Conformal Barrier and Hidden Local Symmetry Constraints: Walking Technirhos in LHC Diboson Channels
• The Diboson Excesses in an Anomaly Free Leptophobic Left-Right Model
• Interpreting a 2 TeV resonance in WW scattering
• Diboson anomaly: heavy Higgs resonance and QCD vector-like exotics
• Intersecting Branes, SUSY Breaking and the 2TeV Excess at the LHC
• Explaining the CMS excesses, baryogenesis and neutrino masses in $E_6$ motivated $U(1{)}_N$ model
• The Diboson Excess: Experimental Situation and Classification of Explanations; A Les Houches Pre-Proceeding
• ATLAS diboson excess from low scale supersymmetry breaking
• Diboson excess in the Higgs singlet and vector-like quark models
• Alternative search strategies for a BSM resonance fitting ATLAS diboson excess
• Muon $g-2$ discrepancy within D-brane string compactifications
• A Megaxion at 750 GeV as a First Hint of Low Scale String Theory
• The Diboson Excesses in Leptophobic $U(1{)}_{\mathrm{LP}}$ Models from String Theories
• ATLAS Diboson Excess from Stueckelberg Mechanism
• High Energy Physics and Cosmology at the Unification Frontier: Opportunities and Challenges in the coming years
• Angular observables for spin discrimination in boosted diboson final states
• Minimal left-right symmetric intersecting D-brane model
• Noncommutative approach to disclose a Higgs group