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Title: Real-time alignment of the LHCb vertex detector and observation of charmless baryonic decays B⁰(s) → pp̄h⁺ h'⁻
Author: Dujany, Giulio
ISNI:       0000 0004 6496 6031
Awarding Body: University of Manchester
Current Institution: University of Manchester
Date of Award: 2017
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This thesis presents measurements of the branching fractions of the charmless baryonic decays B(s) → p anti-p h+ h'-, where h(') denotes a kaon or a pion. Three new modes (B → p anti-p pi+ pi-, Bs → p anti-p K+ K- and Bs → p anti-p K+(-) pi-(+)) are observed for the first time and evidence is found for a fourth (B → p anti-p K+ K-). The inclusive branching fraction of B → p anti-p K+(-) pi-(+) is measured for the first time and the upper limit is set on the branching fraction of the Bs → p anti-p pi+ pi- decay. This represents the first observation of four-body charmless baryonic decays of a Bs meson and one of the first observations of baryonic Bs decays. The implementation of the real-time alignment of LHCb's vertex detector is also described. The novel real-time alignment and calibration strategy adopted by LHCb is essential to allow more stable data taking conditions and an optimal 'offline-quality' reconstruction to be performed at the trigger level, ensuring more efficient trigger selections and the possibility to perform physics analyses directly on the trigger output.
Supervisor: Parkes, Christopher Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available
Keywords: LHCb ; Alignment ; Real-time ; Bs decays ; Branching fraction ; Charmless ; Baryonic ; Flavour physics ; B decays