A search for the pair production of heavy spin-1=2 or spin-3=2 resonances (t*) in proton-proton collisions at (Formula Presented) 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* decays into a top quark (t) and a photon (γ), and the other into a t quark and a gluon (g), i.e., (Formula Presented). 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* 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* particles below 930 (930) GeV and spin-3=2 t* particles below 1330 (1390) GeV. This analysis marks the first search for heavy resonances in the tt̄γg channel. Exploiting the high-energy photon to reduce the backgrounds, this search achieves sensitivity competitive with (Formula Presented) searches for spin-1=2 t* despite the small expected t* → tγ branching fraction.
Search for pair production of heavy resonances in final states with a photon and large-radius jets in proton-proton collisions at √ s = 13 TeV
Abbrescia, M.;Barbieri, M.;Buonsante, M.;Colaleo, A.;D'Anzi, B.;De Palma, M.;Elmetenawee, W.;Louka, M.;Mastrapasqua, V.;My, S.;Nenna, F.;Nuzzo, S.;Pellecchia, A.;Pompili, A.;Radogna, R.;Stamerra, A.;Troiano, D.;Venditti, R.;Zaza, A.;
2026-01-01
Abstract
A search for the pair production of heavy spin-1=2 or spin-3=2 resonances (t*) in proton-proton collisions at (Formula Presented) 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* decays into a top quark (t) and a photon (γ), and the other into a t quark and a gluon (g), i.e., (Formula Presented). 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* 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* particles below 930 (930) GeV and spin-3=2 t* particles below 1330 (1390) GeV. This analysis marks the first search for heavy resonances in the tt̄γg channel. Exploiting the high-energy photon to reduce the backgrounds, this search achieves sensitivity competitive with (Formula Presented) searches for spin-1=2 t* despite the small expected t* → tγ branching fraction.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.


