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dc.contributor.authorD'Onofrio, A
dc.date.accessioned2019-06-11T16:36:03Z
dc.date.available2019-06-11T16:36:03Z
dc.date.issued05/04/2019
dc.identifier.citationD'Onofrio, A. 2019. MEASURING CHARGE ASYMMETRIES IN B-HADRON DECAYS USING TOP QUARK EVENTS WITH THE ATLAS EXPERIMENT. Queen Mary University of Londonen_US
dc.identifier.urihttps://qmro.qmul.ac.uk/xmlui/handle/123456789/57942
dc.descriptionPhDen_US
dc.description.abstractThe large number of top-antitop pair events produced in pp collisions at the Large Hadron Collider (LHC) provides a unique source of b-quarks that can be used to probe the CP violation in heavy-flavour mixing and decay. The measurement presented in this thesis focuses on semi-leptonic top-antitop events where one of the W-bosons decays hadronically and the other one decays leptonically. The charge of the lepton (electron or muon) from the W-boson tags the charge of the b-quark at production. In events where a muon is associated to the semi-leptonic decay of the b-quark (either directly or after a b ! c hadronic transition), two charge asymmetries (CA) and several CP asymmetries, based on the charges of the lepton from the W-boson and this muon, can be measured. My contribution to the first measurement of the CA and CP asymmetries in heavy flavour b- or c-decays from top-antitop lepton+jets events is presented, using the data collected with the ATLAS detector during Run 1 of the LHC (20.3 fb 1) at a centre of mass energy of p s = 8 TeV. However, most of the thesis focuses on my (larger) contribution to this same measurement, performed with data collected by the ATLAS experiment during Run 2, 2015-16 data taking periods, corresponding to an integrated luminosity of 36.1 fb 1 at a centre of mass energy of p s = 13 TeV. Four CP asymmetries (one mixing and three direct) were measured, using Run 1 data, and they are found to be consistent with the Standard Model. The Run 2 analysis results in the measurement of two charge asymmetries, both compatible with zero and consistent with the Standard Model expectations. The overall uncertainty on the Run 2 measurement is halved with respect to the Run 1 result.en_US
dc.language.isoenen_US
dc.publisherQueen Mary University of London
dc.subjectDigital technologiesen_US
dc.subjectOlder peopleen_US
dc.subjectComputer Sciencesen_US
dc.subjectageing populationsen_US
dc.subjectHuman computer interactionen_US
dc.titleMEASURING CHARGE ASYMMETRIES IN B-HADRON DECAYS USING TOP QUARK EVENTS WITH THE ATLAS EXPERIMENTen_US
dc.typeThesisen_US
dc.rights.holderThe copyright of this thesis rests with the author and no quotation from it or information derived from it may be published without the prior written consent of the author


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    Theses Awarded by Queen Mary University of London

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