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PHYSICS PHD DISSERTATION DEFENSE: Zihao Jiang

February 8, 2019 - 11:00am
PAB 102/103

Ph.D. Candidate:  Zihao Jiang
Research Advisor:  Lauren Tompkins

Date: Friday, 02/08/2019
Time: 11:00 AM - 1:00 PM
Location: PAB 102/103

Title: Search of the Higgs Boson Produced through Vector Boson Fusion Decaying to a Pair of Bottom Quarks with the ATLAS detector

Abstract:

The Run I operation of the Large Hadron Collider (LHC) was so successful that both ATLAS and CMS experiments observed the existence of the Higgs boson through four kinds of its decays. However, The Higgs boson was not observed through its highest branching ratio decay channel to a pair of bottom quarks. The LHC raised the center of mass energy to 13 TeV for its Run II operation and opened a new window for exploring the properties of Higgs.

A search of Higgs boson produced by Vector Boson Fusion (VBF) and decaying to bottom quarks using the ATLAS detector was performed with 2016 proton-proton collision data. The multi-variate analysis measured the signal strengths of Higgs production relative to the Standard Model prediction. Furthermore, potential improvements of the analysis techniques using complex neural networks are investigated. In order to understand better the QCD backgrounds, the characteristic variables of the gluon splitting vertex are measured.