Search for pair production of heavy resonances in final states with a photon and large-radius jets in proton-proton collisions at $\sqrt{s}$ = 13 TeV

Abstract

A search for the pair production of heavy spin-1/2 or spin-3/2 resonances (t${}^{\ast }$) in proton-proton collisions at $\sqrt{s}$ = 13 TeV is presented. Data collected with the CMS detector at the CERN LHC from 2016 to 2018 corresponding to an integrated luminosity of 138 fb${}^{-1}$ are used. The analysis targets benchmark signal scenarios where one t${}^{\ast }$ decays into a top quark (t) and a photon ($\gamma$), and the other into a t quark and a gluon (g), i.e., pp $\to$ t${}^{\ast }{\bar{\mathrm{t}}}^{\ast }$ $\to$ tt$\gamma$g. All-hadronic final states from the t pair decay chain are selected using jet substructure techniques. The signal is probed as a function of the t${}^{\ast }$ candidate mass, which is reconstructed using the photon and a top quark candidate jet. No significant deviation from the background-only hypothesis is found. Observed (expected) upper limits on the signal cross section at 95% confidence level are set, excluding masses of spin-1/2 t${}^{\ast }$ particles below 930 (930) GeV and spin-3/2 t${}^{\ast }$ particles below 1330 (1390) GeV. This analysis marks the first search for heavy resonances in the $\mathrm{t}\bar{\mathrm{t}}\gamma$g channel. Exploiting the high-energy photon to reduce the backgrounds, this search achieves sensitivity competitive with pp $\to$ t${}^{\ast }{\bar{\mathrm{t}}}^{\ast }$ $\to$ $\mathrm{t}\bar{\mathrm{t}}$gg searches for spin-1/2 t${}^{\ast }$ despite the small expected t${}^{\ast }$ $\to$ t$\gamma$ branching fraction.

Replaced with the published version. Added the journal reference and the DOI. All the figures and tables can be found at http://cms-results.web.cern.ch/cms-results/public-results/publications/B2G-24-006 (CMS Public Pages)

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