September 30, 2025 Master Thesis Open Access

Fuchs, Lara

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{
  "abstract": "<p>Several observables in the flavor sector, including the charged current ratio <span class=\"math-tex\">\\(\\mathcal{R}(D^{(*)})\\)</span>&nbsp;and the evidence for neutral current <span class=\"math-tex\">\\(B^+\\to K^+\\nu\\bar\\nu\\)</span>&nbsp;have been hinting at deviation from the Standard Model.<br>\nMany proposed extensions predict enhanced rates for lepton flavor violating transitions such as <span class=\"math-tex\">\\(b \\to s \\tau\\ell\\)</span>,&nbsp;as there is no fundamental symmetry&nbsp;protecting lepton flavor conservation.&nbsp;</p>\n\n<p>This thesis provides first estimates of the upper limits on the branching fractions for <span class=\"math-tex\">\\(B^+\\to K^{*+}\\tau^\\pm \\ell^\\mp\\)</span>&nbsp;decay modes, using simulated samples corresponding to a dataset of <span class=\"math-tex\">\\(365\\,\\mathrm{fb}^{-1}\\)</span>&nbsp;collected at the<span class=\"math-tex\">\\(\\Upsilon (4\\mathrm{S})\\)</span>&nbsp;resonance by the Belle II experiment. The accompanying&nbsp;<span class=\"math-tex\">\\(B\\)</span>&nbsp;meson is reconstructed exclusively via hadronic decay modes, enabling&nbsp;signal extraction via a fit to the reconstructed&nbsp;invariant mass of the <span class=\"math-tex\">\\(\\tau\\)</span>&nbsp;lepton.</p>", 
  "author": [
    {
      "family": "Fuchs, Lara"
    }
  ], 
  "id": "22377", 
  "issued": {
    "date-parts": [
      [
        2025, 
        9, 
        30
      ]
    ]
  }, 
  "title": "Search for $B^+\\to K^{*+}\\tau^\\pm \\ell^\\mp$ with hadronic tagging at the Belle II experiment", 
  "type": "thesis"
}