Evidence for Four-Top Quark Production in Proton-Proton Collisions at <math altimg="si1.svg"><msqrt><mrow><mi>s</mi></mrow></msqrt><mo linebreak="goodbreak" linebreakstyle="after">=</mo><mn>13</mn><mspace width="0.2em"/><mtext>TeV</mtext></math>

) is studied with LHC proton-proton collision data samples collected by the CMS experiment at a center-of-mass energy of 13 TeV, and corresponding to integrated luminosities of up to 138

{fb}^{- 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 \bar{t} t \bar{t}

measurement that includes the all-hadronic final state. The observed significance of the

t \bar{t} t \bar{t}

signal in these final states of 3.9 standard deviations (1.5 expected) provides evidence for

t \bar{t} t \bar{t}

production, with a measured cross section of

36_{- 11}^{+ 12} fb

. 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 \pm 4 (stat) \pm 3 (syst) fb

, which is consistent with the standard model prediction.

Note:

All the figures and tables, including additional supplementary figures and tables, can be found at http://cms-results.web.cern.ch/cms-results/public-results/publications/TOP-21-005 (CMS Public Pages)

CMS
Top quark
p p: scattering
top: multiple production
top: pair production
p p: colliding beams
channel cross section: measured
final state: ((n)jet)
final state: ((n)jet lepton)
final state: ((n)jet dilepton)

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