Электронный каталог

Статья

Tumasyan, A.
Search for New Physics Using Effective Field Theory in 13 TeV pp Collision Events That Contain a Top Quark Pair and a Boosted Z or Higgs Boson / 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, V.Shalaev, S.Shmatov, S.Shulha, V.Smirnov, O.Teryaev, N.Voytishin, B.S.Yuldashev, A.Zarubin, I.Zhizhin, N.Krasnikov, M.Finger, M.Finger Jr., Z.Tsamalaidze, [CMS Collab.] // Physical Review D [Electronic resource]. – 2023. – Vol.108, No.3. – P. 032008. – URL: https://doi.org/10.1103/PhysRevD.108.032008. – Bibliogr.: 105.

A data sample containing top quark pairs (tt^-) produced in association with a Lorentz-boosted Z or Higgs boson is used to search for signs of new physics using effective field theory. The data correspond to an integrated luminosity of 138  fb*−*1 of proton-proton collisions produced at a center-of-mass energy of 13 TeV at the LHC and collected by the CMS experiment. Selected events contain a single lepton and hadronic jets, including two identified with the decay of bottom quarks, plus an additional large-radius jet with high transverse momentum identified as a Z or Higgs boson decaying to a bottom quark pair. Machine learning techniques are employed to discriminate between tt^-Z or tt^-H events and events from background processes, which are dominated by tt^-+jets production. No indications of new physics are observed. The signal strengths of boosted tt^-Z and tt¯H production are measured, and upper limits are placed on the tt^-Z and tt^-H differential cross sections as functions of the Z or Higgs boson transverse momentum. The effects of new physics are probed using a framework in which the standard model is considered to be the low-energy effective field theory of a higher energy scale theory. Eight possible dimension-six operators are added to the standard model Lagrangian, and their corresponding coefficients are constrained via fits to the data.



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
Спец.(статьи,препринты) = С 346.6е2 - Промежуточные бозоны
ОИЯИ = ОИЯИ (JINR)2023