eprintid: 25790
rev_number: 12
eprint_status: archive
userid: 4189
dir: disk0/00/02/57/90
datestamp: 2019-01-09 08:40:25
lastmod: 2019-02-19 10:37:38
status_changed: 2019-01-09 08:40:25
type: doctoralThesis
metadata_visibility: show
creators_name: Mitzel, Dominik
title: Search for new physics in rare four-body charm decays
subjects: 530
divisions: 130200
adv_faculty: af-13
abstract: 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.
date: 2019
id_scheme: DOI
id_number: 10.11588/heidok.00025790
ppn_swb: 1655133500
own_urn: urn:nbn:de:bsz:16-heidok-257907
date_accepted: 2018-12-19
advisor: HASH(0x5561209572c0)
language: eng
bibsort: MITZELDOMISEARCHFORN2019
full_text_status: public
citation:   Mitzel, Dominik  (2019) Search for new physics in rare four-body charm decays.  [Dissertation]     
document_url: https://archiv.ub.uni-heidelberg.de/volltextserver/25790/1/Dissertation_Mitzel.pdf