Searching for New Heavy Neutral Gauge Bosons using Vector Boson Fusion Processes at the LHC

Abstract

New massive resonances are predicted in many extensions to the Standard Model (SM) of particle physics and constitutes one of the most promising searches for new physics at the LHC. We present a feasibility study to search for new heavy neutral gauge bosons using vector boson fusion (VBF) processes, which become especially important as the LHC probes higher collision energies. In particular, we consider the possibility that the discovery of a $Z^{\prime }$ boson may have eluded searches at the LHC. The coupling of the $Z^{\prime }$ boson to the SM quarks can be small, and thus the $Z^{\prime }$ would not be discoverable by the searches conducted thus far. In the context of a simplified phenomenological approach, we consider the $Z^{\prime }\to \tau \tau$ and $Z^{\prime }\to \mu \mu$ decay modes to show that the requirement of a dilepton pair combined with two high $p_T$ forward jets with large separation in pseudorapidity and with large dijet mass is effective in reducing SM backgrounds. The expected exclusion bounds (at 95\% confidence level) are $m(Z^{\prime })<1.8$ TeV and $m(Z^{\prime })<2.5$ TeV in the $\tau \tau j_f{j}_f$ and $\mu \mu j_f{j}_f$ channels, respectively, assuming 1000 fb${}^{-1}$ of 13 TeV data from the LHC. The use of the VBF topology to search for massive neutral gauge bosons provides a discovery reach with expected significances greater than 5$\sigma$ (3$\sigma$) for $Z^{\prime }$ masses up to 1.4 (1.6) TeV and 2.0 (2.2) TeV in the $\tau \tau j_f{j}_f$ and $\mu \mu j_f{j}_f$ channels.

8 pages, 12 figures

References in corpus (9)

• Observation of a new particle in the search for the Standard Model Higgs boson with the ATLAS detector at the LHC
• Observation of a new boson at a mass of 125 GeV with the CMS experiment at the LHC
• The automated computation of tree-level and next-to-leading order differential cross sections, and their matching to parton shower simulations
• Comparative study of various algorithms for the merging of parton showers and matrix elements in hadronic collisions
• Test of lepton universality using $B^{+}\to K^{+}{\ell }^{+}{\ell }^{-}$ decays
• Search for high-mass diphoton resonances in proton-proton collisions at 13 TeV and combination with 8 TeV search
• Vector Boson Fusion Processes as a Probe of Supersymmetric Electroweak Sectors at the LHC
• Anomaly driven signatures of new invisible physics at the Large Hadron Collider
• Probing Compressed Sleptons at the LHC using Vector Boson Fusion Processes

Cited by in corpus (5)

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• Expanding the Reach of Heavy Neutrino Searches at the LHC
• Probing Heavy Spin-2 Bosons with $\gamma \gamma$ final states from Vector Boson Fusion Processes at the LHC
• Long-term LHC Discovery Reach for Compressed Higgsino-like Models using VBF Processes
• Connecting Particle Physics and Cosmology: Measuring the Dark Matter Relic Density in Compressed Supersymmetry at the LHC