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Title: Studies of excited D mesons in B meson decays
Author: Wallace, Charlotte
ISNI:       0000 0004 6062 3971
Awarding Body: University of Warwick
Current Institution: University of Warwick
Date of Award: 2016
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This thesis documents the studies of several three-body B+ meson decays, each with a charged charmed meson in the final state. All analyses presented use a data sample recorded by the LHCb detector in 2011 and 2012, corresponding to an integrated luminosity of 3:0 fb‾1 of pp collision data. The B+ →D‾ K+π + and B+ →D+ K+π.+ decay modes are observed for the first time. The branching fraction of the favoured B+ → D‾ K+π + decay mode is measured relative to the topologically similar B+ →D‾ π+ π+ decay and the B+ ‾ D‾ K+π+ final state is used as a normalisation channel for the suppressed B+ → D+ K+ π‾.decay branching fraction measurement. Searches are performed for the quasi-two-body decays B+→ D+ K* (892) 0 and B+ → D*2(2460) 0 K+ , using the sample of B+ → D+ K+π‾ candidate decays. No significant signals are observed for either decay mode and upper limits are set on their branching fractions. Excited charmed mesons decaying to D‾π+ are studied by performing fits to the Dalitz plots of B+ →D‾ K+π+ and B+ → D.‾π+π + candidates. A structure at m(D‾π.+) 2:78 GeV=c2 in the D‾ K+π+ data sample is determined to have spin-1 for the first time. Evidence from the B+ → D‾π+π + Dalitz plot suggests that the states at m(D‾π+ ) 2:76 GeV=c2 and 3:00 GeV=c2 , have spin-3 and spin-2, respectively. The mass and width parameters of these states are measured precisely, as are those of the well known D‾*2 (2460) 0 resonance. Fit fractions and product branching fractions are calculated for all contributions in the B+ ! D. K+ + and B+ → D‾π+ π+ amplitude models.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available
Keywords: QC Physics