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Master Thesis

A contribution to the search for CP Violation in Λ0b four-body decays

Abstract : CP-asymmetries, experimentally observed in mesons decays and mixing, are currently remarkably described by the single CP-violating phase of the Standard Model. The CP violation in baryon decays is unobserved to date and would provide a complementary and invaluable input in this landscape. The charmless b-baryon 4-body decays might be a relevant place to perform this very first observation. My master internship gives a contribution to this quest. In order to select events of interest, a multivariate analysis has been performed, and gives an efficient separation between signal and combinatorial background. Moreover, CP-asymmetries measurement require to characterize detection efficiencies as well as asymmetries of production. Events containing same final states of interest, which are reached via b → c transitions, can be used as control channels. In the analysis presented in this work, a fit model is built and shows satisfactory results to describe these charmed decays. Eventually, the knowledge of the background sources present in the spectra of interest must be mastered. We conducted a dedicated analysis to understand their origin and believe that they are now under control.
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https://dumas.ccsd.cnrs.fr/dumas-01228601
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Submitted on : Friday, November 13, 2015 - 2:18:44 PM
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  • HAL Id : dumas-01228601, version 1

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Maxime Vernet. A contribution to the search for CP Violation in Λ0b four-body decays. High Energy Physics - Phenomenology [hep-ph]. 2015. ⟨dumas-01228601⟩

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