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Studies of the rare decays B⁰(B⁰s) → π⁺π⁻µ⁺µ⁻ with the LHCb experiment
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Millard, E. (2020) Studies of the rare decays B⁰(B⁰s) → π⁺π⁻µ⁺µ⁻ with the LHCb experiment. PhD thesis, University of Warwick.
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WRAP_Theses_Millard_2020.pdf - Submitted Version - Requires a PDF viewer. Download (31Mb) | Preview |
Official URL: http://webcat.warwick.ac.uk/record=b3598166~S15
Abstract
Flavour changing neutral currents only occur at loop level within the Standard Model of particle physics. This makes these processes extremely rare and potentially sensitive to interference with currently undiscovered physics that lies beyond the scope of the Standard Model. To date, tensions with the Standard Model have been found in the studies of b → sl⁺l⁻ processes at large hadronic recoil. This thesis presents a branching fraction analysis of the b → d(s)µ⁺µ⁻ processes B⁰(B⁰s) → π⁺π⁻µ⁺µ⁻ using the data recorded by the LHCb collaboration during Run 1 and Run 2 of the Large Hadron Collider. The presence of the B⁰(B⁰s) → π⁺π⁻µ⁺µ⁻ decays are confirmed with a statistical significance in excess of 12 standard deviations. The branching fraction of the B⁰ → π⁺π⁻µ⁺µ⁻ process is measured to be (2.35±0.26±0.18)×10−8 while the branching fraction of the B⁰s → π⁺π⁻µ⁺µ⁻ process is measured to be (5.35±0.64±0.24)×10−8 where the first uncertainties are statistical and the second systematic. In addition, this thesis presents for the first time the branching fraction measurements for the decay modes in two separate regions of the invariant mass of the dimuon pair, q². The B⁰ decay is observed for the first time at both large and small hadronic recoil while the B⁰s decay is observed for the first time at large hadronic recoil.
| Item Type: | Thesis (PhD) | ||||
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| Subjects: | Q Science > QC Physics | ||||
| Library of Congress Subject Headings (LCSH): | Particles (Nuclear physics), Beta decay, Muons -- Decay, Pions -- Decay, Large Hadron Collider (France and Switzerland) | ||||
| Official Date: | December 2020 | ||||
| Dates: |
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| Institution: | University of Warwick | ||||
| Theses Department: | Department of Physics | ||||
| Thesis Type: | PhD | ||||
| Publication Status: | Unpublished | ||||
| Supervisor(s)/Advisor: | Blake, Thomas | ||||
| Format of File: | |||||
| Extent: | viii, 240 leaves : illustrations (some colour) | ||||
| Language: | eng |
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