Abstract
This chapter describes the selection of the \(VH(b\bar{b})\) events in the boosted analysis. The first part discusses the criteria used to identify physics objects. The second part explains the selection of both the Higgs boson and vector boson candidates. In the final part all the details of the event categorization are illustrated.
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Notes
- 1.
The 70% efficiency of the b-tagging algorithm corresponds to a c-jet and light-flavour jet rejections equal to 9 and 304, respectively.
- 2.
Since the radius parameter of the Higgs candidate jet is \(R = 1.0\), only small-\(R\) jets with an angular separation grater that 1.0 with the Higgs candidate are considered (\(\Delta R (\text {small-}{R} \text{jets}, H_{\text {cand.}}) > 1.0\)).
- 3.
This means that the gray dots in Fig. 5.2 represent all the events that pass the trigger and \(E_{\text {T}}^{\text {miss}}\) cuts divided by the total number of generated event.
- 4.
In the 1-tag region either the leading or the sub-leading VR track-jets is b-tagged so the expected efficiency can be calculated subtracting to the unity the probability to have zero b-tagged track-jets which is 9% (\(0.3 \times 0.3 = 0.09=9\% \)).
- 5.
About 30% of the signal events have at least three VR track-jets.
- 6.
The contribution of the multi-jet background is not shown in the plots because, as discussed in the text, it is negligible after applying the event selection cuts. More information of the multi-jet background suppression can be found in Sect. 6.3.7.
- 7.
The assumption of neglecting the lepton and neutrino masses is explained by the fact that the lepton and neutrino have masses much smaller that the W boson mass.
- 8.
The imaginary solutions are a consequence of the finite resolution of the detector.
- 9.
Small-\(R\) jets are used in these studies instead of VR track-jets in order to have an easier estimate of the systematics uncertainties.
- 10.
In this case, the b-tagged track-jet is considered outside the Higgs candidate jet if it is not ghost-matched to the Higgs candidate jet.
References
Bukin AD (2007) Fitting function for asymmetric peaks. arXiv:0711.4449 [physics.data-an]
Aad G et al. (2020) Measurement of the associated production of a Higgs boson decaying into b-quarks with a vector boson at high transverse momentum in pp collisions at \(\sqrt{s} = 13 TeV\) with the ATLAS detector. arXiv:2008.02508 [hep-ex]
Goncalves D, Nakamura J (2018) Role of the Z polarization in the \(H \rightarrow b\bar{b}\) measurement. Phys Rev D 98:093005. https://doi.org/10.1103/PhysRevD.98.093005. arXiv:1805.06385 [hep-ph]
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Di Gregorio, G. (2023). Event Selection and Categorization. In: A Beauty-ful Boson. Springer Theses. Springer, Cham. https://doi.org/10.1007/978-3-031-20013-7_5
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DOI: https://doi.org/10.1007/978-3-031-20013-7_5
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