# Angular analysis of $$\Lambda_b^0 \rightarrow\Lambda \mu^+\mu^-$$ and $$\Lambda _b^0 \rightarrow J/\psi\Lambda$$ decays with the LHCb detector

Chatzikonstantinidis, Georgios (2019). Angular analysis of $$\Lambda_b^0 \rightarrow\Lambda \mu^+\mu^-$$ and $$\Lambda _b^0 \rightarrow J/\psi\Lambda$$ decays with the LHCb detector. University of Birmingham. Ph.D.

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## Abstract

In this thesis the angular analysis of $$\Lambda_b^0 \rightarrow\Lambda \mu^+\mu^-$$ and $$\Lambda _b^0 \rightarrow J/ \psi\Lambda$$ decays is presented, using data from pp collisions recorded by the LHCb experiment between 2011 and 2016, corresponding to an integrated luminosity of approximately 5 fb$$^{-1}$$. For the $$\Lambda_b^0 \rightarrow\Lambda \mu^+\mu^-$$ decay, the angular observables are extracted at low hadronic-recoil using the method of moments. This is the first time that the complete set of the angular observables has been measured; the results are published in Ref. [1]. A measurement of the angular observables of the $$\Lambda_b^0 \rightarrow J/ \psi\Lambda$$ decays is also performed. The angular observables are extracted using a moment analysis; an interpretation of the results in terms of the production polarisation of $$\Lambda_b^0$$ and the decay amplitudes is also performed. This is the first time that the complete set of the angular observables of the $$\Lambda_b^0 \rightarrow J/ \psi\Lambda$$ has been measured; the results are preliminary and correspond to the current status of the analysis.

Type of Work: Thesis (Doctorates > Ph.D.)
Award Type: Doctorates > Ph.D.
Supervisor(s):
Supervisor(s)EmailORCID
Watson, NigelUNSPECIFIEDorcid.org/0000-0002-8142-4678
Bifani, SimoneUNSPECIFIEDorcid.org/0000-0001-7072-4854