Search for high-mass resonances in a final state comprising a gluon and two hadronically decaying W bosons in proton-proton collisions at $\sqrt{s}$ = 13 TeV

TL;DR

This paper reports a search for high-mass resonances decaying into a gluon and two W bosons in proton-proton collisions, setting limits on specific extra-dimensional model parameters using CMS data at 13 TeV.

Contribution

First analysis to examine the resonant WW+jet signature and set limits on the masses of Kaluza--Klein gluon and radion in an extended warped extra-dimensional model.

Findings

No excess observed above standard model background.

Upper limits set on g_KK production cross section times branching fraction.

Constraints placed on the masses of g_KK and radion particles.

Abstract

A search for high-mass resonances decaying into a gluon, g, and two W bosons is presented. A Kaluza--Klein gluon, g$_\mathrm{KK}$, decaying in cascade via a scalar radion R, g$_\mathrm{KK}$ $\to$ gR $\to$ gWW, is considered. The final state studied consists of three large-radius jets, two of which contain the products of hadronically decaying W bosons, and the third one the hadronization products of the gluon. The analysis is performed using proton-proton collision data at $\sqrt{s}$ = 13 TeV collected by the CMS experiment at the CERN LHC during 2016-2018, corresponding to an integrated luminosity of 138 fb$^{-1}$. The masses of the g$_\mathrm{KK}$ and R candidates are reconstructed as trijet and dijet masses, respectively. These are used for event categorization and signal extraction. No excess of data events above the standard model background expectation is observed. Upper limits are set on the product of the g$_\mathrm{KK}$ production cross section and its branching fraction via a radion R to gWW. This is the first analysis examining the resonant WW+jet signature and setting limits on the two resonance masses in an extended warped extra-dimensional model.