Abstract
Until Run2 in 2015, this search has used an inclusive tagger for SM Higgs boson and top quark, requiring higher mass of large-R jets. On the other hand, the difference between VLQ signal and the dominant background of \(t\bar{t}\,+{\ge }\)1b is the existence of boosted Higgs boson. A boosted Higgs boson tagger is promising to discriminate the signal from backgrounds and to improve the sensitivity. In the first part of this chapter, the exclusive Higgs boson and top quark taggers are defined and optimised.
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Notes
- 1.
The purity is not estimated for \(t\bar{t}+\mathrm {jets}\) backgrounds since the backgrounds do not include the Higgs bosons.
- 2.
For the Higgs boson tagger, the small-R jet mass can be used. But the uncertainty on the mass for the small mass range can be derived from the Run1 measurement.
- 3.
For the top quark tagger, the upper thresholds of mass and constituents are not set in order to develop a high acceptance tagger with a minimum set of requirements.
- 4.
It is not necessary to check the sensitivity in this case because the validation regions are not used for searching for excesses of data but for the validation of the background estimation.
- 5.
It is not necessary to check the sensitivity in this case because the validation regions are not used for the searching for excesses of data but for the validation of the background estimation.
References
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ATLAS Collaboration (2017) Jet reclustering and close-by effects in ATLAS Run 2. ATLAS-CONF-2017-062. https://cds.cern.ch/record/2275649
Aad G et al (2015) Search for production of vector-like quark pairs and of four top quarks in the lepton-plus-jets final state in \(pp\) collisions at \(\sqrt{s} = 8\) TeV with the ATLAS detector. JHEP 08:105. arXiv:1505.04306 [hep-ex]
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Yamaguchi, D. (2019). Optimisations of Heavy Object Tagging and Event Categorisation. In: Search for New Phenomena in Top-Antitop Quarks Final States with Additional Heavy-Flavour Jets with the ATLAS Detector. Springer Theses. Springer, Singapore. https://doi.org/10.1007/978-981-15-0932-2_6
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