Search for pair production of heavy particles decaying to a top quark and a gluon in the lepton+jets final state in proton-proton collisions at $\sqrt{s}$ = 13 TeV - INSPIRE

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Search for pair production of heavy particles decaying to a top quark and a gluon in the lepton+jets final state in proton-proton collisions at $\sqrt{s}$ = 13 TeV

CMS

Collaboration

Oct 27, 2024

43 pages

e-Print:

2410.20601 [hep-ex]

Report number:

CMS-B2G-22-005,
CERN-EP-2024-266

Experiments:

CERN-LHC-CMS

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Abstract: (arXiv)

A search is presented for the pair production of new heavy resonances, each decaying into a top quark (t) or antiquark and a gluon (g). The analysis uses data recorded with the CMS detector from proton-proton collisions at a center-of-mass energy of 13 TeV at the LHC, corresponding to an integrated luminosity of 138 fb

^{-1}

. Events with one muon or electron, multiple jets, and missing transverse momentum are selected. After using a deep neural network to enrich the data sample with signal-like events, distributions in the scalar sum of the transverse momenta of all reconstructed objects are analyzed in the search for a signal. No significant deviations from the standard model prediction are found. Upper limits at 95% confidence level are set on the product of cross section and branching fraction squared for the pair production of excited top quarks in the

\mathrm{t^*}

\to

tg decay channel. The upper limits range from 0.12 pb to 0.8 fb for a

\mathrm{t^*}

with spin-1/2 and from 0.015 pb to 1.0 fb for a

\mathrm{t^*}

with spin-3/2. These correspond to mass exclusion limits up to 1050 and 1700 GeV for spin-1/2 and spin-3/2

\mathrm{t^*}

particles, respectively. These are the most stringent limits to date on the existence of

\mathrm{t^*}

\to

tg resonances.

Note:

Submitted to the European Physical Journal C. All figures and tables can be found at http://cms-results.web.cern.ch/cms-results/public-results/publications/B2G-22-005 (CMS Public Pages)

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