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Статья

Tumasyan, A.
Evidence for Four-Top Quark Production in Proton-Proton Collisions at *%s = 13 TeV / A.Tumasyan, S.Afanasiev, D.Budkouski, I.Golutvin, I.Gorbunov, V.Karjavine, V.Korenkov, A.Lanev, A.Malakhov, V.Matveev, V.Palichik, V.Perelygin, M.Savina, S.Shmatov, V.Shalaev, S.Shulha, V.Smirnov, O.Teryaev, N.Voytishin, B.S.Yuldashev, A.Zarubin, I.Zhizhin, M.Finger, M.Finger Jr., Z.Tsamalaidze, N.Krasnikov, [CMS Collab.] // Physics Letters B [Electronic resource]. – 2023. – Vol.844. – P.138076. – URL: https://doi.org/10.1016/j.physletb.2023.138076. – Bibliogr.:70.

The production of four top quarks (t¯tt¯t) is studied with LHC proton-proton collision data samples collected by the CMS experiment at a center-of-mass energy of 13TeV, and corresponding to integrated luminosities of up to 138fb−1. Events that have no leptons (all-hadronic), one lepton, or two opposite-sign leptons (where lepton refers only to prompt electrons or prompt muons) are considered. This is the first t¯tt¯tmeasurement that includes the all-hadronic final state. The observed significance of the t¯tt¯tsignal in these final states of 3.9 standard deviations (1.5 expected) provides evidence for t¯tt¯tproduction, with a measured cross section of 36+12−11fb. Combined with earlier CMS results in other final states, the signal significance is 4.0 standard deviations (3.2 expected). The combination returns an observed cross section of 17 ±4 (stat)±3 (syst)fb, which is consistent with the standard model prediction.



Спец.(статьи,препринты) = С 346.2в - Взаимодействие протонов с протонами
Спец.(статьи,препринты) = С 346.6д1 - Чармоний, боттомоний, топ-кварк. Очарованные частицы и др. резонансы из тяжелых кварков
ОИЯИ = ОИЯИ (JINR)2023