Abstract
In order to eliminate subjective bias in our analysis method, we performed a blind analysis. Selection requirements and analysis techniques were optimised based on MC expectation in the signal regions.
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- 1.
The data analysis starts from a skim of the dataset that is commonly used for analysing \(e\mu \) final states. Unfortunately, this skim requires a CC or EC electron. These requirements were defined before the development of electron identification in the IC region.
- 2.
We use the CP version of the code and grid files.
- 3.
This is also convenient since the available \(Z/\gamma ^{*} \rightarrow \tau ^+\tau ^- \) MC samples are relatively small (see Sect. 7.2) and could potentially introduce unsightly statistical fluctuations at the selected signal candidate stage of the analysis.
- 4.
An alternative approach would have been to require that one of the muons assigned as a \(Z/\gamma ^{*}\) daughter is matched to a single muon trigger, thus eliminating trigger bias altogether (to a good approximation at least). This would result in a \(\approx \)20 % reduction in signal acceptance in the \(Z/\gamma ^{*} \rightarrow \mu ^+\mu ^- \) channels. Given that correcting the bias does not introduce any significant uncertainty, the inclusive trigger approach is clearly the better option.
- 5.
Since the systematic uncertainties are small compared to the statistical uncertainties, it is not considered necessary to evaluate two-sided variations. This saves a considerable amount of computing time.
- 6.
It should be noted that some of the other measurements are translated into pure \(ZZ\) or \(WZ\) cross sections. The previous D0 analysis of the \(ZZ/\gamma ^{*} \rightarrow \nu \bar{\nu }\ell ^+\ell ^- \) process used the MCFM [17] program to estimate a correction factor of 3.4 % that converts a \(ZZ/\gamma ^{*} \) cross section into a pure \(ZZ/\gamma ^{*} \) cross section. Considering the overall uncertainties, such details do not significantly affect the comparison with previous measurements. These previous measurements are also discussed in Chap. 1.
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Vesterinen, M. (2012). Measurement of the \(ZZ\) and \(WZ\) Production Cross Sections. In: Z Boson Transverse Momentum Distribution, and ZZ and WZ Production. Springer Theses. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-30788-1_7
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DOI: https://doi.org/10.1007/978-3-642-30788-1_7
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