Meer, Tim van der (2024) Study of $\Lambda_b^0 \rightarrow \Lambda^0 \; \mu^+ \mu^$ at low $q^2$. Bachelor's Thesis, Physics.

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Abstract
The rare $\Lambda_b^0 \rightarrow \Lambda^0 \; \mu^+ \mu^$ decay is studied and the possibility of measuring a nonzero branching fraction is discussed. The study introduces a normalisation mode $\Lambda_b^0 \rightarrow \Lambda^0 J/\psi \; (\rightarrow \mu^+ \mu^)$ used to find the branching fraction of the dimuon mode. An efficiency representing the mismatch between the number of total and observed events is calculated. A hyper Gaussian function fit is used to model expected detector data signal with Monte Carlo simulated events. The signal model shows a disparity between the fitted function and the reconstructed mass spectrum as the number of events predicted by the integral under the fit do not match the actual number of simulated events. Real detector data fitting is unsuccessful. Improvements could include more consistent analysis methods, machine learning algorithms, researching and modelling backgrounds as well as utilising a truth matching method.
Item Type:  Thesis (Bachelor's Thesis) 

Supervisor name:  Perrevoort, A. 
Degree programme:  Physics 
Thesis type:  Bachelor's Thesis 
Language:  English 
Date Deposited:  25 Jul 2024 10:03 
Last Modified:  25 Jul 2024 10:03 
URI:  https://fse.studenttheses.ub.rug.nl/id/eprint/33693 
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