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Title: Measurements of charge and CP asymmetries in b-hadron decays using top-quark events collected by the ATLAS detector in pp collision at √s = 8 TeV
Author: Kempster, Jacob
ISNI:       0000 0004 8499 7134
Awarding Body: Royal Holloway, University of London
Current Institution: Royal Holloway, University of London
Date of Award: 2017
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Same- and opposite-sign charge asymmetries are measured in lepton+jets top anti-top events in which a b-hadron decays semileptonically to a soft muon, using data corresponding to an integrated luminosity of 20.3 fb-1 from proton-proton collisions at a centre-of-mass energy of √s = 8 TeV collected by the ATLAS detector at the Large Hadron Collider at CERN. The charge asymmetries are based on the charge of the lepton from the top-quark decay and the charge of the soft muon from the semileptonic decay of a b-hadron and are measured in a fiducial region corresponding to the experimental acceptance. Four CP asymmetries (one mixing and three direct) are measured and are found to be compatible with zero and consistent with the Standard Model.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available
Keywords: particle ; physics ; atlas ; cern ; top ; quark ; cp ; cpv ; violation ; soft ; muon ; b-physics ; tagging ; detector ; charge ; hadron ; lepton ; collider ; Accelerator ; proton