Feasibility study of a search for lepton-flavour violating Λb → Λμτ decays at the LHCb experiment

Uroz Rodríguez, Ignacio Jacob (2025) Feasibility study of a search for lepton-flavour violating Λb → Λμτ decays at the LHCb experiment. Bachelor's Thesis, Physics.

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Abstract

This research project presents a feasibility study of the search for the lepton-flavour vio- lating (LFV) decay Λ0b → Λ0μ−τ+ using simulations made in RapidSim. The analysis explores which key observables, particularly the invariant mass and the corrected mass, allow for effective discrimination between signal and the potential background process Λ0b → Λ0τ−τ+. Distributions for the invariant mass and corrected mass of the reconstructed Λ0b candidates were generated and compared. The corrected mass was found to significantly improve the reso- lution and alignment with the true Λ0b mass, particularly in signal events with a single undetected neutrino in its final state. In contrast, the background events, which include three neutrinos in the final state, exhibited a broader and more shifted distribution. This leads to a clear separation between signal and background, with the corrected mass emerging as the most promising variable for future searches of LFV decays. While the results are promising, the study is based on fast simulation and does not include full detector effects, efficiencies, or systematic uncertainties. Future work should incorporate full Monte Carlo simulations within the LHCb framework to validate and extend these findings. Nevertheless, this study demonstrates that the corrected mass can provide a powerful tool in the search for rare LFV processes in baryonic decays.

Item Type:	Thesis (Bachelor's Thesis)
Supervisor name:	Perrevoort, A.
Degree programme:	Physics
Thesis type:	Bachelor's Thesis
Language:	English
Date Deposited:	18 Jul 2025 14:22
Last Modified:	18 Jul 2025 14:22
URI:	https://fse.studenttheses.ub.rug.nl/id/eprint/36407

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