02716nab a2200373 c 4500
vtls000795385
RU-ToGU
20230606212204.0
cr |
210316|2020 gw s a eng d
10.1140/epjc/s10052-019-7593-7
doi
to000795385
RU-ToGU
rus
RU-ToGU
Search for production of four top quarks in final states with same-sign or multiple leptons in proton-proton collisions at √s=13 TeV
A. M. Sirunyan, A. Tumasyan, W. Adam [et al.]
Текст
электронный
Библиогр.: 77 назв.
The standard model (SM) production of four top
quarks (tt tt) in proton–proton collisions is studied by the
CMS Collaboration. The data sample, collected during the
2016–2018 data taking of the LHC, corresponds to an integrated
luminosity of 137 fb−1 at a center-of-mass energy of
13 TeV. The events are required to contain two same-sign
charged leptons (electrons or muons) or at least three leptons,
and jets. The observed and expected significances for the tt tt
signal are respectively 2.6 and 2.7 standard deviations, and
the tt tt cross section ismeasured to be 12.6+5.8
−5.2 fb.The results
are used to constrain the Yukawa coupling of the top quark
to the Higgs boson, yt, yielding a limit of |yt/ySM
t | < 1.7 at
95% confidence level, where ySM
t is the SMvalue of yt. They
are also used to constrain the oblique parameter of the Higgs
boson in an effective field theory framework, Hˆ < 0.12.Limits
are set on the production of a heavy scalar or pseudoscalar
boson in Type-II two-Higgs-doublet and simplified darkmatter
models, with exclusion limits reaching 350–470 GeV and
350–550 GeV for scalar and pseudoscalar bosons, respectively.
Upper bounds are also set on couplings of the top
quark to new light particles.
топ-кварки
лептоны
протон-протонные столкновения
статьи в журналах
879358
Tumasyan, Armen
510818
Adam, Wolfgang
510819
Borshch, Vladislav
510820
Ivanchenko, Vladimir
500157
Tcherniaev, Evgueni
500158
Sirunyan, A. M.
510821
The European physical journal C
2020
Vol. 80, № 2. P. 75 (1-31)
1434-6044
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http://vital.lib.tsu.ru/vital/access/manager/Repository/vtls:000795385
статья
480359