Abstract
A measurement of the inclusive $pp\to t\bar{t}+X$ production cross section in the $\tau+{\rm jets}$ final state using only the hadronic decays of the $\tau$ lepton is presented. The measurement is performed using 20.2 fb$^{-1}$ of proton-proton collision data recorded at a center-of-mass energy of $\sqrt{s}=8$ TeV with the ATLAS detector at the Large Hadron Collider. The cross section is measured via a counting experiment by imposing a set of selection criteria on the identification and kinematic variables of the reconstructed particles and jets, and on event kinematic variables and characteristics. The production cross section is measured to be $\sigma_{t\bar{t}}= 239 \pm 29$ pb, which is in agreement with the measurements in other final states and the theoretical predictions at this center-of-mass energy.
Highlights
An important component of the Large Hadron Collider (LHC) [1] physics program is the measurement of the properties of the top quark, which is the most massive fundamental particle observed to date
The number of events observed for each τhad type and for the combined analysis are reported in Table III along with the predicted number of background events
→ tt of þ X cross integrated section at luminosity collected with the ATLAS detector has been performed
Summary
An important component of the Large Hadron Collider (LHC) [1] physics program is the measurement of the properties of the top quark, which is the most massive fundamental particle observed to date. This article reports on a measurement of the tt production cross section in the τ þ jets final state, where the hadronic final states of the τ lepton (τhad) are used exclusively. Differences between measurements or between measurement and theory could lead to the discovery of non-Standard-Model physics or to limits on its possible extensions Previous measurements in this final state have been collaborations at performed by the D0 the Tevatron operating a[t3p] ffisaffi n1⁄4d. The 2HDM can produce an excess of t → τ þ X decays if flavor-changing neutral couplings are allowed as in type-3 models [15,16] This allows t → cH and if the Higgs boson decays as H → τþτ−, an excess of events with t → τ þ X decays would be observed relative to the SM.
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