Электронный каталог

Статья

Hayrapetyan, A.
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 *%s=13 TeV / A.Hayrapetyan, S.Afanasiev, V.Alexakhin, D.Budkouski, I.Golutvin, I.Gorbunov, V.Karjavine, V.Korenkov, N.Krasnikov, A.Lanev, A.Malakhov, V.Matveev, V.Palichik, V.Perelygin, S.Polikarpov, M.Savina, V.Shalaev, S.Shmatov, S.Shulha, V.Smirnov, O.Teryaev, N.Voytishin, B.S.Yuldashev, A.Zarubin, I.Zhizhin, Z.Tsamalaidze, [CMS Collab.]. – text: electronic // The European Physical Journal C. – 2025. – Vol. 85, No. 3. – P. 342. – URL: https://doi.org/10.1140/epjc/s10052-024-13729-y. – Bibliogr.: 85.

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 t∗ → tg decay channel. The upper limits range from 120 to 0.8 fb for a t∗ with spin-1/2 and from 15 to 1.0 fb for a 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 t∗ particles, respectively. These are the most stringent limits to date on the existence of t∗ → tg resonances.



ОИЯИ = ОИЯИ (JINR)2025