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.

Preview

Chatzikonstantinidis2019PhD.pdf
Text
Available under License All rights reserved.
Download (6MB) | Preview

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):