Precision tests of EWK sector and direct searches for new physics with di-boson production

Lead Research Organisation: University of Manchester
Department Name: Physics and Astronomy

Abstract

The initial focus of this project is to search for new physics resonances in the electroweak (EWK) sector using data collected from
ATLAS at the LHC. The searches are looking for particles such as the Randell-Sundrum Graviton, G, and the heavy vector boson W0.
The decay channels investigated in this project are ZZ or WZ llqq, where W and Z are the charged and neutral vector bosons l is a lepton
and q is a quark. The lepton is either an electron or a muon and the quarks form jets which can be resolved as either two jets or one large
jet depending on the momentum of the quarks. An important part of these searches are the modeling of the background events and any sys-
tematics associated with the analysis. If no new physics is found then limits will be placed on the production rate for hypothetical signals.
The project will also set limits on the anomalous Triple Gauge Boson Couplings (aTGC), e.g. WW Z, and anomalous Quartic Gauge Bo-
son couplings (aQGC), e.g. WZ X WZ. This is done using the effective Lagrangian approach which investigates the contributions of
loop and off-shell processes to lower energy levels which are achievable at the LHC. The investigations into this look at the kinematic distri-
butions of the WW or WZ to see if there are any signicant changes due these processes.

The authorship task for ATLAS associated with this project is the investigation into the observed innefficiency of the muon trigger full scan
chains in the case of close by muons. The full scan procedure is an event filter process which searches the whole detector without using
any information from the other levels of the trigger. The observed innefficiency is 10% per muon when muons are close each other at
dR < 0:3. The aim of the task is to investigate the problem, its causes and to find a solution to increase the innefficiency.

Publications

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Studentship Projects

Project Reference Relationship Related To Start End Student Name
ST/N504178/1 01/10/2015 31/03/2021
1669021 Studentship ST/N504178/1 21/09/2015 31/03/2019 David Lack
 
Description ATLAS 
Organisation ATLAS Experiment
Country Switzerland 
Sector Public 
PI Contribution I work as part of the VZ to llqq Exotics analysis in the ATLAS experiment. I have worked on the muon trigger software for ATLAS experiment and have attended and presented at the HLT UK meetings.
Collaborator Contribution ATLAS has held training exercises in the software and supplied access to data and meta data crucial for the analysis I'm on/
Impact DOI: 10.1007/JHEP03(2018)009
Start Year 2015
 
Description ATLAS 
Organisation Atlas UK
Country United Kingdom 
Sector Private 
PI Contribution I work as part of the VZ to llqq Exotics analysis in the ATLAS experiment. I have worked on the muon trigger software for ATLAS experiment and have attended and presented at the HLT UK meetings.
Collaborator Contribution ATLAS has held training exercises in the software and supplied access to data and meta data crucial for the analysis I'm on/
Impact DOI: 10.1007/JHEP03(2018)009
Start Year 2015
 
Description ATLAS Underground tours 
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 took groups from the public on a tour of the ATLAS visitor service and then down into the experimental cavern when the LHC was in shutdown
Year(s) Of Engagement Activity 2017
 
Description Manchester Science Festival 
Form Of Engagement Activity Participation in an activity, workshop or similar
Part Of Official Scheme? No
Geographic Reach Local
Primary Audience Public/other audiences
Results and Impact I operated a stand at the Manchester Science Festival about cosmics rays. It was designed to inform and spark interest. I answered questions from school children to old age pensioners.
Year(s) Of Engagement Activity 2015
 
Description Pint of Science Manchester 
Form Of Engagement Activity Participation in an activity, workshop or similar
Part Of Official Scheme? No
Geographic Reach Local
Primary Audience Public/other audiences
Results and Impact I helped organise an event where speakers would come and talk about their research in a way that the general public would find accessible.
Year(s) Of Engagement Activity 2016