March 28, 2022 Master Thesis Open Access

Weidemann, Lucas

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        "affiliation": "KIT/ETP", 
        "name": "Weidemann, Lucas"
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    "description": "<p>Axion-Like-Particles (ALPs) are a well motivated extension to the Standard Model. They are light, pseudoscalar particles which are dominantly interacting with Standard Model gauge bosons. As a result ALPs can be produced in a flavor-changing neutral current transition by its coupling to W bosons. Subsequently, the ALP dominantly decays into two photons, which makes the decay of a charged B meson to a charged K meson and an axion, which subsequently decays to two photons, a promising process for measuring the coupling to W bosons. Such decays can be studied at e+ e&minus; colliders like the Belle II experiment. In this thesis a simulation-based sensitivity study of this process is performed by reconstructing the B meson and examining the invariant di-photon mass distribution. The study is performed with ALPs in mass range 0.1-4.6 GeV and zero lifetime. The expected limits are comparable to the results of the BaBar Collaboration, who conducted a similar search.</p>", 
    "keywords": [
      "Axion-Like-Particles", 
      "ALP", 
      "Belle II", 
      "B meson", 
      "Kaon", 
      "Sensitivity", 
      "Punzi", 
      "Monte Carlo", 
      "New physics"
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    "language": "eng", 
    "publication_date": "2022-03-28", 
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      "subtype": "master-thesis", 
      "title": "Master Thesis", 
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      "report_number": "ETP-KA/2022-04", 
      "supervisors": [
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          "affiliation": "KIT/ETP", 
          "name": "Ferber, Torben"
        }, 
        {
          "affiliation": "KIT/ETP", 
          "name": "Klute, Markus"
        }
      ]
    }, 
    "title": "Simulation-based Sensitivity Study of short-lived Axion-like Particles in B Meson Decays at the Belle II Experiment"
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