Search for heavy resonances decaying into a vector boson and a Higgs boson in final states with charged leptons, neutrinos, and b quarks

TL;DR

This paper reports a search for heavy resonances decaying into a Higgs and a vector boson using CMS data at 13 TeV, setting limits on resonance masses below 2 TeV and improving previous constraints.

Contribution

It introduces a novel analysis method combining jet mass and b tagging to identify Higgs decays in leptonic and neutrino channels at 13 TeV.

Findings

No significant excess observed over background.

Resonances with mass less than 2 TeV are excluded at 95% CL.

Limits on model parameters are improved compared to previous searches.

Abstract

A search for heavy resonances decaying to a Higgs boson and a vector boson is presented. The analysis is performed using data samples collected in 2015 by the CMS experiment at the LHC in proton-proton collisions at a center-of-mass energy of 13 TeV, corresponding to integrated luminosities of 2.2-2.5 inverse femtobarns. The search is performed in channels in which the vector boson decays into leptonic final states (Z to nu nu, W to l nu, and Z to l l, with l = e, mu), while the Higgs boson decays to collimated b quark pairs detected as a single massive jet. The discriminating power of a jet mass requirement and a b jet tagging algorithm are exploited to suppress the standard model backgrounds. The event yields observed in data are consistent with the background expectation. In the context of a theoretical model with a heavy vector triplet, a resonance with mass less than 2 TeV is excluded at 95% confidence level. The results are also interpreted in terms of limits on the parameters of the model, improving on the reach of previous searches.