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Angular Distributions in t-channel Single-top Decay

Ng, Chi Wing (2023) Angular Distributions in t-channel Single-top Decay. Doctoral Dissertation, University of Pittsburgh. (Unpublished)

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The Standard Model (SM) is by far the most theory describing physics phenomena, nevertheless there are still observations that does not match SM predictions, for example the large matter-antimatter asymmetry in the universe, which hint at physics beyond the Standard Model (BSM Physics). The top quark, which is the heaviest among all fundamental particles in the SM, is the most experimentally relevant probe to BSM Physics. In SM, top quarks can be produced by charged-current electroweak interaction through the Wtb vertex, which leads to a high degree of polarization of top quarks produced. In this thesis, angular distribution of decay products in single top quark t-channel events are used to determine the three components of polarization vector of the top quark ensemble and anti-top quark ensemble. After establishing a significant polarization beyond 0, an on-going analysis aims to use the quadruple differential decay rate of the same set of events to simultaneously determine limits on 6 EFT coefficients. Both analyses are based on \pp collision data with \sqrt{s} = 13TeV at the LHC collected by the ATLAS detector, with an integrated luminosity of 139.0 fb^-1.


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Item Type: University of Pittsburgh ETD
Status: Unpublished
CreatorsEmailPitt UsernameORCID
Ng, Chi Wingchn43@pitt.educhn430000-0001-8190-4017
ETD Committee:
TitleMemberEmail AddressPitt UsernameORCID
Committee ChairMueller, James
Committee MemberBoudreau, Joseph
Committee MemberBatell,
Committee MemberKosowsky,
Committee MemberPaulini,
Date: 6 September 2023
Date Type: Publication
Defense Date: 17 July 2023
Approval Date: 6 September 2023
Submission Date: 22 July 2023
Access Restriction: 2 year -- Restrict access to University of Pittsburgh for a period of 2 years.
Number of Pages: 287
Institution: University of Pittsburgh
Schools and Programs: Dietrich School of Arts and Sciences > Physics
Degree: PhD - Doctor of Philosophy
Thesis Type: Doctoral Dissertation
Refereed: Yes
Uncontrolled Keywords: thesis, t-channel, top-quark, effective-field-theory, physics, particle-physics
Date Deposited: 06 Sep 2023 19:06
Last Modified: 06 Sep 2023 19:06


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