Abstract
A combination of kinematic information about the objects in the event, event shape distributions and the output of a b-jet tagging algorithm. A preliminary version of this analysis was first presented at the Moriond 2011 conference and published as a conference result.
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Notes
- 1.
when a \(b\bar{b}\) pair is added either in the matrix-element or the parton showering
- 2.
determined by subtracting the expected statistical uncertainty in quadrature
- 3.
The initial uncertainties on the \(\beta _i\) correspond to the Gaussian constraints on the background normalization.
- 4.
no systematic uncertainties external to the fit are estimated here, since only the fitter behavior is to be tested
- 5.
In both cases jets with \(p_T\) > 200Â GeV are assigned the same shift in uncertainty as jets at \(p_T\) = 200Â GeV.
- 6.
Additional tests are documented in ATLAS internal documentation related to this analysis, see ATL-COM-PHYS-2011-1012.
- 7.
in the preliminary version
- 8.
For technical reasons, an approximation of the likelihood function by a Gaussian is used in the \(\ell \)+jets channel, constructed from the covariance matrix returned by the fit. Checks were performed to ensure that this procedure yields the same results in the profiling.
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Henrichs, A.C. (2014). Measurement of \({\sigma _{t\bar{t}}} \) in 35 \(\text {pb}^{-1}\) of Data. In: Top Quark Pair Production. Springer Theses. Springer, Cham. https://doi.org/10.1007/978-3-319-01487-6_6
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