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First observation of B0 → D*(2007)0 K+π- and Bs0 → D*(2007)0 K-π+ decays in LHCb
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Brossa Gonzalo, A. (2021) First observation of B0 → D*(2007)0 K+π- and Bs0 → D*(2007)0 K-π+ decays in LHCb. PhD thesis, University of Warwick.
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Official URL: http://webcat.warwick.ac.uk/record=b3765756~S15
Abstract
Measurements of the γ angle of the unitarity triangle formed from elements of the CKM matrix are achieved through the study of B hadron decays featuring interference between b → cus and b → ucs processes. Such measurements are affected by a systematic uncertainty due to the limited knowledge of yet to be observed partially reconstructed decays featuring soft neutral final state particles. Unless knowledge of these decays is improved, the precision of future determination of γ may become limited by this source of uncertainty. In this thesis such decays are studied, resulting in the first observation of B0 → D∗ (2007)0K+π − and B0 s → D∗ (2007)0K−π + decays, and measurements of their branching fractions with respect of that of B0 → D∗ (2007)0π +π − decays. In addition, results on the phase space distribution of such decays are given, which directly benefit the understanding of these decays as partially reconstructed backgrounds in measurements of γ in B+ → DK+ and B0 → DK+π − decay studies. The B0 → D∗ (2007)0K+π − and B0 s → D∗ (2007)0K−π + decay channels also provide interesting insight for the study of resonances in the charm sector and could themselves be used in the future for determinations of γ. The study presented in this thesis is based on the data recorded by the LHCb experiment during the years from 2016 to 2018, corresponding to a sample of 5.4 fb−1 . It constitutes the first analysis within the LHCb collaboration featuring fully reconstructed D∗ (2007) → D0γ and D∗ (2007) → D0π 0 decays, and pioneers the usage of a novel weighting method while implementing an event-by-event efficiency correction to account for resonant structures in the decays under study.
| Item Type: | Thesis (PhD) | ||||
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| Subjects: | Q Science > QC Physics | ||||
| Library of Congress Subject Headings (LCSH): | Beta decay, Particles (Nuclear physics) -- Charm, CP violation (Nuclear physics), Branching fractions (Nuclear physics), Standard model (Nuclear physics) | ||||
| Official Date: | November 2021 | ||||
| Dates: |
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| Institution: | University of Warwick | ||||
| Theses Department: | Department of Physics | ||||
| Thesis Type: | PhD | ||||
| Publication Status: | Unpublished | ||||
| Supervisor(s)/Advisor: | Gershon, T. J. ; Latham, Thomas | ||||
| Format of File: | |||||
| Extent: | vi, 217 leaves ; colour illustrations | ||||
| Language: | eng |
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