Oijen, Emma van (2024) Testing the Validity of Run 3 LHCb Data Utilising the Λ0b → Λ0J/ψ Decay. Bachelor's Thesis, Physics.
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Abstract
During the last long shutdown of the LHC from 2019 to 2022, the LHCb detector had a major upgrade of both detector components and event trigger software which should allow a significant increase in the amount of available statistics [1]. Data belonging to the Λ0b → Λ0J/ψ decay has been analysed to determine whether the detector operates as anticipated such that the rare Λ0b → Λ0µ+µ− decay can be investigated in the search for beyond the standard model physics [2]. The data taken in 2023 is statistically very limited and shows an unexpected angular dependence as a result of the compromised position of the VELO subdetector. A comparison by means of the Kolmogorov-Smirnov test between MC simulation and the first 2024 measurements as well as between matter and antimatter has yielded no issues in the 2024 experimental data. The former method is statistically different with mitigating factors yielding no definitive conclusion and the latter is supportive of the validity and usability of the data. The yield per integrated luminosity with a cut-based signal selection is in agreement with the expected value, while a deviation occurs once sideband subtraction is included. Possible explanations include that too much signal is caught in the sideband or that the efficiency determined by MC simulation is overestimated.
| Item Type: | Thesis (Bachelor's Thesis) |
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| Supervisor name: | Mulder, M. and Hoekstra, S. |
| Degree programme: | Physics |
| Thesis type: | Bachelor's Thesis |
| Language: | English |
| Date Deposited: | 10 Jul 2024 11:58 |
| Last Modified: | 10 Jul 2024 11:58 |
| URI: | https://fse.studenttheses.ub.rug.nl/id/eprint/33200 |
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