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Search for new physics in rare four-body charm decays

Mitzel, Dominik

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This dissertation presents a search for physics beyond the Standard Model in D0->π+π-μ+μ−und D0->K+K−μ+μ− decays at the LHCb experiment. These rare four-body decays of neutral charm mesons receive contributions from electroweak flavour-changing neutral current c->ul+l− transitions and are unique probes for potential new heavy degrees of freedom and for additional sources of CP violation in the up-type quark sector. Using a sample of proton-proton collisions corresponding to an integrated luminosity of 2 fb−1 recorded at a center-of-mass energy of 8TeV in 2012, the first observation of D0->π+π-μ+μ−und D0->K+K−μ+μ− decays is reported. Furthermore, their branching fractions are measured. With an increased data set, corresponding to an integrated luminosity of 5 fb−1 and recorded at center-of-mass energies of 7, 8 and 13TeV in the years 2011-2016, the first measurement of the CP asymmetry ACP , the forward-backward asymmetry in the lepton system AFB and the triple-product asymmetry A2ϕ in these decays is presented. All observables are also investigated as functions of the dimuon mass. The results are consistent with Standard Model predictions.

Item Type: Dissertation
Supervisor: Uwer, Prof. Dr. Ulrich
Date of thesis defense: 19 December 2018
Date Deposited: 09 Jan 2019 08:40
Date: 2019
Faculties / Institutes: The Faculty of Physics and Astronomy > Institute of Physics
Subjects: 530 Physics
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