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Amplitude analysis of Lambda_b^0 --> Lambda_c^+ D^0 K^- decays and pentaquark searches in the Lambda_c^+ D^0 system at the LHCb experiment

Piucci, Alessio

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Abstract

This thesis reports the amplitude analysis of Lambda_b^0 --> Lambda_c^+ D^0 K^− decays using data collected by the LHCb experiment from proton-proton collisions, corresponding to an integrated luminosity of 9.1 fb −1 . A new amplitude fitter has been developed in the context of this analysis, which exploits novel computing concepts and software frameworks. Numerous models predict large couplings of the pentaquark candidates observed by LHCb to the Lambda_c^+ D^0 system. This makes the Lambda_b^0 → Lambda_c^+ D^0 K^− channel meaningful to discriminate between models which attempt to describe the internal structure of the pentaquark states. Amplitude fits are performed to measure the contributions of intermediate resonances to Lambda_b^0 → Lambda_c^+ D^0 K^− decays and upper limits are set for the observation of pentaquark states in this channel. The results obtained are in contrast with the expectations from the most popular theory models which describe the pentaquark states as Σ D^∗ -Σ^∗ D molecules.

Item Type: Dissertation
Supervisor: Hansmann-Menzemer, Prof. Dr. Stephanie
Place of Publication: Heidelberg
Date of thesis defense: 16 October 2019
Date Deposited: 11 Nov 2019 09:15
Date: 2019
Faculties / Institutes: The Faculty of Physics and Astronomy > Institute of Physics
Subjects: 530 Physics
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