CMS-PAS-B2G-21-007

CMS-PAS-B2G-21-007
Search of a Vector-Like Quark T' $\to$ tH in the di-photon final state
CMS Collaboration
July 2022

Abstract: A search for the production of a Vector-Like Quark, T' is presented. The search is based on proton-proton collision events collected at 13 TeV by the CMS detector at the CERN LHC. The data sample corresponds to an integrated luminonsity of 138 fb $^{-1}$ , collected between 2016 and 2018. The search looks specifically for the production of a T' quark which then decays to a top quark and a Higgs boson (T' $\to$ tH); with the Higgs boson subsequently decaying into a pair of photons (H $\to \gamma \gamma$ ). The top quark can decay either hadronically ( $\mathrm{t \to bq\bar{q} }$ ) or leptonically ( $t \rightarrow bl\nu$ ). This search presents an upper limit on the T' production cross section for the mass range 600-1200 GeV. No significant excess over the standard model background is observed, accordingly T' masses up to 730 GeV are excluded at 95% confidence level. This search is the first to use the reconstruction of the H $\to \gamma \gamma$ invariant mass, leveraging an experimental resolution of 1-2%. This technique leads to an increased sensitivity to T' mass values up to 1 TeV with respect to the previous searches.
Links: CDS record (PDF) ; Physics Briefing ; CADI line (restricted) ; These preliminary results are superseded in this paper, JHEP 09 (2023) 057. The superseded preliminary plots can be found here.

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