Searches for Higgs boson pair production at the High Luminosity Large Hadron Collider (HL-LHC) with the ATLAS experiment

Lead Research Organisation: University of Birmingham
Department Name: School of Physics and Astronomy

Abstract

The Large Hadron Collider (LHC) at CERN will be undergoing an upgrade at the end of 2022 which will increase its delivered energy and probe the new energy frontier. The Higgs boson self coupling is an important parameter predicted by the standard model of particle physics that is still yet to be discovered. This study looks for di-Higgs production in the promising bbyy final state, with one Higgs decaying to a b and anti-b quark and the 2nd to a pair of photons. I have developed a method based on weights to exploit the low statistics available. Also implemented a Boosted Decision Tree (BDT) to further increase the chance of detecting the HH->bbyy signal from the huge backgrounds expected at the HL-LHC.

Publications

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Studentship Projects

Project Reference Relationship Related To Start End Student Name
ST/N503939/1 01/10/2015 30/09/2020
1658252 Studentship ST/N503939/1 01/10/2015 31/03/2019 Daniel Briglin
 
Title Weighted method for data analysis with limited statistics 
Description A method of data analysis where statistics are limited. Combinations of all possible outcomes are calculated with a probability to occur (weight). 
Type Of Material Improvements to research infrastructure 
Year Produced 2017 
Provided To Others? No  
Impact An increase in the signal observed and a decrease in backgrounds (both good for particle physics). Decrease in the processing time for a set number of events 
 
Description Guided tours of ATLAS 
Form Of Engagement Activity Participation in an open day or visit at my research institution
Part Of Official Scheme? No
Geographic Reach International
Primary Audience Public/other audiences
Results and Impact I gave 3 tours of the ATLAS underground cavern.
Year(s) Of Engagement Activity 2018
 
Description Presentations on my work (too many to note them all) 
Form Of Engagement Activity A talk or presentation
Part Of Official Scheme? No
Geographic Reach International
Primary Audience Postgraduate students
Results and Impact Many talks given about my work to many different audiences
Year(s) Of Engagement Activity 2015,2016,2017,2018
 
Description School Visits to CERN x 4 
Form Of Engagement Activity Participation in an open day or visit at my research institution
Part Of Official Scheme? No
Geographic Reach International
Primary Audience Postgraduate students
Results and Impact 30 x 4 pupils attended for a school visit to the research organisation, which sparked questions and discussion afterwards, and the school reported increased interest in related subject areas.
Year(s) Of Engagement Activity 2017,2018