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Hadronic showers in a highly granular silicon-tungsten calorimeter and production of bottom and top quarks at the ILC

Abstract : This thesis presents studies for the International Linear Collider (ILC), a linear electron-positron collider with a nominal center-of- mass energy from 250 GeV to 500 GeV. Data are analysed that were recorded with the physics proto- type of the CALICE silicon-tungsten electromagnetic calorimeter (Si-W ECAL) prototype at FermiLab in 2008. During this thesis, a track-finding algorithm was developed, which finds secondary tracks in hadronic events recorded by the Si-W ECAL physics prototype. This algorithm reveals details of hadronic interactions in the detec- tor volume and the results are compared with simulations based on the the geant4 toolkit. Indirect searches of New Physics require a high precision on the measurements of the Standard Model parameters. Many Be- yond Standard Model theories, like extradimentional or composite models, imply modifications of electroweak couplings of the heavy quarks, top and bottom. The second part of the thesis is a full sim- ulation study of vertexing algorithms in the ILD environment and the reconstruction of the b-quark charge. The b-quark charge recon- struction is essential for many physics channels at the ILC, particu- larly, for the e + e ! bb̄ and the e + e ! tt̄ channels. The developed algorithm improves the b-quark charge reconstruction performance. The b-quark charge reconstruction methods are applied to the analysis of the tt̄ production process. This allows to increase statis- tics for the top quark electroweak form factor estimation w.r.t an earlier study and thus to decrease corresponding statistical uncer- tainties. The results of the detector study allow for an estimation of the ILC precision on the b-quark electroweak couplings and form fac- tors. The ILC will be able to resolve the LEP anomaly in the bb̄ production process. The ILC precision on the right-handed Z 0 bb̄ coupling, a prime candidate for e↵ects of new physics, is calculated to be at least 5 times better than the LEP experiments.
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https://tel.archives-ouvertes.fr/tel-01826535
Contributor : Sviatoslav Bilokin <>
Submitted on : Friday, June 29, 2018 - 2:50:11 PM
Last modification on : Wednesday, October 14, 2020 - 4:00:39 AM
Long-term archiving on: : Thursday, September 27, 2018 - 8:59:46 AM

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Sviatoslav Bilokin. Hadronic showers in a highly granular silicon-tungsten calorimeter and production of bottom and top quarks at the ILC. High Energy Physics - Experiment [hep-ex]. Paris Saclay, 2017. English. ⟨tel-01826535⟩

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