eprintid: 16272
rev_number: 12
eprint_status: archive
userid: 1029
dir: disk0/00/01/62/72
datestamp: 2014-02-14 08:16:50
lastmod: 2014-03-06 09:55:52
status_changed: 2014-02-14 08:16:50
type: doctoralThesis
metadata_visibility: show
creators_name: Bien, Alexander
title: Measurement of the polarisation amplitudes in B0 -> J/psi K*(892)0 decays with the LHCb experiment
subjects: ddc-530
divisions: i-130200
adv_faculty: af-13
cterms_swd: Parität
cterms_swd: CP-Parität 
cterms_swd: Polarisation
abstract: In this thesis a measurement of the polarisation amplitudes and the corresponding strong phases of the decay B0 -> J/psi(mu+mu-)K*(892)0(K+pi-) is presented. Studying B0 -> J/psi(mu+mu-)K*(892)0(K+pi-) and B0 -> J/psi(mu+mu-)K*(892)0(K-pi+) decays separately allows for the measurement of direct CP violation. The Standard Model of particle physics does not predict any CP-violating processes for this decay channel. Thus, this analysis also serves as a search for new phenomena beyond the Standard Model. The measurement is performed using the full data sample collected with the LHCb detector in 2011 taken in proton-proton collisions at a centre-of-mass energy of 7 TeV corresponding to an integrated luminosity of approximately 1.0 fb-1. The determination of the polarisation
amplitudes requires an angular analysis of the final state particles to disentangle the three possible angular momentum states. The observables are obtained using a four-dimensional maximum likelihood fit depending on the three decay angles and the decay time of the B0 meson. The values of the polarisation amplitudes and corresponding phases are determined to be R_para = 0.227 pm 0.004 pm 0.011, R_perp = 0.201 pm 0.004 pm 0.008, delta_para = -2.94 pm 0.02 pm 0.03 and delta_perp = 2.94 pm 0.02 pm 0.02, where the errors are statistical and systematic, respectively. The fit is performed in four bins of the K+pi- invariant mass to measure the fraction of the non-resonant K+pi-, so-called S-wave, contribution. Averaged over all mass bins, it is measured to be F_S = (6.4 pm 0.3 pm 1.0)%. By determining the phase difference between the resonant P-wave and the S-wave contributions in the four mass bins a two-fold ambiguity in the strong phases is resolved. Furthermore, no evidence for CP violation is observed.
date: 2014
id_scheme: DOI
id_number: 10.11588/heidok.00016272
ppn_swb: 1653547294
own_urn: urn:nbn:de:bsz:16-heidok-162721
date_accepted: 2014-02-05
advisor: HASH(0x55e0f7ec4cc8)
language: eng
bibsort: BIENALEXANMEASUREMEN2014
full_text_status: public
citation:   Bien, Alexander  (2014) Measurement of the polarisation amplitudes in B0 -> J/psi K*(892)0 decays with the LHCb experiment.  [Dissertation]     
document_url: https://archiv.ub.uni-heidelberg.de/volltextserver/16272/1/BienDoktorarbeit.pdf