Search fo an Invisible Boson in Tau Decays with Early Belle II Data and 
Development of New Analysis Methods for Tau Physics

Krätzschmar, Thomas M.

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Thesis

Search fo an Invisible Boson in Tau Decays with Early Belle II Data and Development of New Analysis Methods for Tau Physics

MPS-Authors

Krätzschmar, Thomas M.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

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https://publications.mppmu.mpg.de/2022/MPP-2022-332/FullText.pdf
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https://mediatum-ub-tum-de.eaccess.tum.edu/?id=1684577
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Citation

Krätzschmar, T. M. (2022). Search fo an Invisible Boson in Tau Decays with Early Belle II Data and Development of New Analysis Methods for Tau Physics. PhD Thesis, TU München, München.

Cite as: https://hdl.handle.net/21.11116/0000-000C-B5B7-9

Abstract

This thesis searches for "tau to lepton + invisible". We search with 62.8 fb-1 of Belle II data and find no evidence for this decay. We determine an upper limit in the range of 1‰ to 1% for the ratio of branching ratios. This thesis contributed to Belle II performance studies. We develop and test new tau-rest frame estimation methods and find that one (the GKK method) shows perspectives to substantially enhance the statistical precision of the tau mass measurement.