hep-ex — Pith

hep-ex

High Energy Physics - Experiment

Results from high-energy/particle physics experiments and prospects for future experimental results, including tests of the standard model, measurements of standard model parameters, searches for physics beyond the standard model, and astroparticle physics experimental results. Does not include: detectors and instrumentation nor analysis methods to conduct experiments.

hep-ex 2026-05-14 2 theorems

CMS sets T quark limits from 2 pb at 600 GeV to 0.1 pb at 1000 GeV

by CMS Collaboration

Search for single vector-like quark production in opposite-sign dilepton final states in proton-proton collisions at sqrt{s} = 13 TeV

First opposite-sign dilepton search for vector-like top quark to top plus Higgs finds no signal in 138 fb^{-1} of 13 TeV data

abstract click to expand

A search is presented for single production of a vector-like top quark T, decaying into the standard model top quark and Higgs boson, in a final state including two opposite-sign leptons (electrons or muons), jets, and missing transverse momentum. The data were recorded by the CMS experiment in proton-proton collisions at a center-of-mass energy of 13 TeV at the CERN LHC in the years 2016$-$2018, and corresponding to an integrated luminosity of up to 138 fb$^{-1}$. No excess in data over the background expectations is observed. Upper limits at 95% confidence level on the product of the T production cross section and its decay branching fraction to tH are set, ranging from 2.0 pb at a T mass of 600 GeV to 0.1 pb at 1000 GeV. This is the first search in the T $\to$ tH channel in opposite-sign dilepton final states.