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| CMS-PAS-B2G-24-006 | ||
| Search for pair production of heavy resonances in photon plus large-radius jets final states in pp collisions at $ \sqrt{s}= $ 13 TeV | ||
| CMS Collaboration | ||
| 23 April 2025 | ||
| Abstract: We present a search for the pair production of heavy spin-3/2 or spin-1/2 resonances ($ \mathrm{t}^{*} $) in proton-proton collisions at $ \sqrt{s}= $ 13 TeV. We use data collected by the CMS detector at the CERN LHC from 2016 to 2018, corresponding to an integrated luminosity of 138 fb$ ^{-1} $. The analysis targets signal scenarios where one $ \mathrm{t}^{*} $ decays into a top quark (t) and a gluon (g), and the other into a t and a photon ($ \gamma $), via the process $ \mathrm{pp}\rightarrow\mathrm{t}^{*}\bar{\mathrm{t}^{*}}\rightarrow\mathrm{tg\bar{t}}\gamma $. All-hadronic final states from the t pair decay chain are selected using jet substructure techniques. The mass of the $ \mathrm{t}^{*} $ candidate is reconstructed using the photon and a top-candidate jet, which is then used to probe the signal. No significant deviation from the background-only hypothesis is observed. Observed (expected) upper limits on the signal cross section at 95% confidence level are set, excluding masses of spin-1/2 $\mathrm{t}^{*} $ particles below 940 (1000) GeV and spin-3/2 $\mathrm{t}^{*} $ particles below 1330 (1410) GeV. This analysis marks the first search for heavy resonances in the $ \mathrm{tg\bar{t}}\gamma $ final state. Exploiting the high-energy photon, which reduces background despite the small $ \mathrm{t}^{*}\rightarrow\mathrm{t}\gamma $ branching ratio, this search achieves sensitivity comparable to $ \mathrm{pp}\rightarrow\mathrm{t}^{*}\bar{\mathrm{t}^{*}}\rightarrow\mathrm{tg\bar{t}g} $ searches. | ||
| Links: CDS record (PDF) ; CADI line (restricted) ; | ||
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Compact Muon Solenoid LHC, CERN |
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