Search for leptophobic Z' bosons decaying into four-lepton final states in proton-proton collisions at sqrt(s) = 8 TeV

TL;DR

This paper reports a search for leptophobic Z' bosons decaying into four-lepton final states in proton-proton collisions at 8 TeV, setting new limits and excluding Z' masses below 2.5 TeV.

Contribution

First to constrain leptophobic Z' bosons in the four-lepton channel using CMS data at 8 TeV.

Findings

No excess events observed over standard model background.

Excluded leptophobic Z' bosons with masses below 2.5 TeV.

Set upper limits on production cross section and branching fraction.

Abstract

A search for heavy narrow resonances decaying into four-lepton final states from cascade decays of a Z' boson has been performed using proton-proton collision data at sqrt(s) = 8 TeV collected by the CMS experiment, corresponding to an integrated luminosity of 19.7 inverse femtobarns. No excess of events over the standard model background expectation is observed. Upper limits for a benchmark model on the product of cross section and branching fraction for the production of these heavy narrow resonances are presented. The limit excludes leptophobic Z' bosons with masses below 2.5 TeV within the benchmark model. This is the first result to constrain a leptophobic Z' resonance in the four-lepton channel.