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Measurements of Electroweak Z Boson + Dijet Production

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QCD Radiation in Top-Antitop and Z+Jets Final States

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Abstract

The production of dijets in association with a Z-boson (Z\(_{\text {jj}}\) production) is dominated by the Drell-Yan process, with the additional jets arising as a result of the strong interaction.

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Notes

  1. 1.

    \(\mathrm{p}_{\mathrm{T}}^\mathrm{balance}\) is defined as:

    $$\begin{aligned} \mathrm{p}_{\mathrm{T}}^\mathrm{balance}= \frac{(p^{l_1}+p^{l_2} + p^{j_1} + p^{j_2})_\mathrm{T}}{\mathrm{p}_{\mathrm{T}}^{l_1} + \mathrm{p}_{\mathrm{T}}^{l_2} + \mathrm{p}_{\mathrm{T}}^{j_1} + \mathrm{p}_{\mathrm{T}}^{j_2}} \end{aligned}$$
    (7.1)

    where \(l_1\) and \(l_2\) label the two leptons which make up the Z-boson candidate.

  2. 2.

    In the EWUnfolding package the default procedure treats the correction factors like efficiencies, and the binomial uncertainty equation is used, \(\sigma \,\)=\(\,\sqrt{\epsilon (1-\epsilon )/N}\). However, these correction factors are not true efficiencies and in principle could have values larger than 1.

  3. 3.

    Apart from the differential cross section as a function of \(|\Delta {y}|\) in the search and control phase spaces, all distributions are fit across their entire range. The differential cross section as a function of \(|\Delta {y}|\) in these phase spaces has an unusual shape and is difficult to fit. Therefore the fit is performed in the steeply-falling region 3 \(<\) \(|{\Delta }y|\) \(<\) 8, where statistics are lower and the smoothing procedure becomes more important.

  4. 4.

    \(\sigma _\mathrm{{toy}}\) is either added or taken away from \(\mu _\mathrm{{toy}}\) to produce the largest difference with respect to the nominal \(N_\mathrm{EW}\).

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Authors and Affiliations

  1. Christie Medical Physics and Engineering, The Christie NHS Foundation Trust, Manchester, UK

    Kiran Joshi

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  1. Kiran Joshi
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Correspondence to Kiran Joshi .

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Joshi, K. (2015). Measurements of Electroweak Z Boson + Dijet Production. In: QCD Radiation in Top-Antitop and Z+Jets Final States. Springer Theses. Springer, Cham. https://doi.org/10.1007/978-3-319-19653-4_7

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