Study of $\Lambda_b^0 \rightarrow \Lambda^0 \; \mu^+ \mu^-$ at low $q^2$

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

Preview	Text bPHYS2024MeerTvd.pdf Download (1MB) | Preview
	Text toestemming.pdf Restricted to Registered users only Download (421kB)

Abstract

The rare $\Lambda_b^0 \rightarrow \Lambda^0 \; \mu^+ \mu^-$ decay is studied and the possibility of measuring a non-zero 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

Actions (login required)

View Item