Master Thesis Open Access

Search for $B^+\to K^{*+}\tau^\pm \ell^\mp$ with hadronic tagging at the Belle II experiment

Fuchs, Lara

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<oai_dc:dc xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:oai_dc="http://www.openarchives.org/OAI/2.0/oai_dc/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.openarchives.org/OAI/2.0/oai_dc/ http://www.openarchives.org/OAI/2.0/oai_dc.xsd">
  <dc:creator>Fuchs, Lara</dc:creator>
  <dc:date>2025-09-30</dc:date>
  <dc:description>Several observables in the flavor sector, including the charged current ratio \(\mathcal{R}(D^{(*)})\) and the evidence for neutral current \(B^+\to K^+\nu\bar\nu\) have been hinting at deviation from the Standard Model.
Many proposed extensions predict enhanced rates for lepton flavor violating transitions such as \(b \to s \tau\ell\), as there is no fundamental symmetry protecting lepton flavor conservation. 

This thesis provides first estimates of the upper limits on the branching fractions for \(B^+\to K^{*+}\tau^\pm \ell^\mp\) decay modes, using simulated samples corresponding to a dataset of \(365\,\mathrm{fb}^{-1}\) collected at the\(\Upsilon (4\mathrm{S})\) resonance by the Belle II experiment. The accompanying \(B\) meson is reconstructed exclusively via hadronic decay modes, enabling signal extraction via a fit to the reconstructed invariant mass of the \(\tau\) lepton.</dc:description>
  <dc:identifier>https://publish.etp.kit.edu/record/22377</dc:identifier>
  <dc:identifier>oai:publish.etp.kit.edu:22377</dc:identifier>
  <dc:relation>url:https://publish.etp.kit.edu/communities/belle2</dc:relation>
  <dc:relation>url:https://publish.etp.kit.edu/communities/etp</dc:relation>
  <dc:rights>info:eu-repo/semantics/openAccess</dc:rights>
  <dc:title>Search for $B^+\to K^{*+}\tau^\pm \ell^\mp$ with hadronic tagging at the Belle II experiment</dc:title>
  <dc:type>info:eu-repo/semantics/masterThesis</dc:type>
  <dc:type>thesis-master-thesis</dc:type>
</oai_dc:dc>
Publication date:
September 30, 2025
Awarding University:
Karlsruhe Institute of Technology (KIT)
Report Number:
ETP-KA/2025-16
Communities:

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