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@PHDTHESIS{Martinov:638646,
      author       = {Martinov, Tommy},
      othercontributors = {Tackmann, Kerstin and Schleper, Peter},
      title        = {{E}xperimental study of inclusive charmless semileptonic
                      beauty meson decays at {B}elle {II}},
      school       = {University of Hamburg},
      type         = {Dissertation},
      reportid     = {PUBDB-2025-04127},
      pages        = {195},
      year         = {2025},
      note         = {Dissertation, University of Hamburg, 2025},
      abstract     = {A measurement of partial branching fractions of charmless
                      semileptonic beauty meson decaysusing an inclusively
                      reconstructed hadronic system is presented. These decays are
                      denoted asB → Xuℓν, where Xu represents a hadronic
                      system containing a u quark produced in the un-derlying
                      quark-level b → u transition. The measurement uses the
                      full Run 1 Belle II samplecorresponding to 365 fb−1 of
                      e+e− → Υ(4S) → B ¯B data. One of the two B mesons is
                      recon-structed in a hadronic decay channel to constrain the
                      signal kinematics. Events containing asignal electron or
                      muon ℓ are selected, while the rest of the event defines
                      the hadronic systemXu associated with the signal. To
                      discriminate the signal from the 50-times larger
                      backgroundoriginating from Cabibbo-favoured semileptonic B
                      → Xcℓν decays, a template fit is performedin both
                      signal and control regions after applying an optimised
                      selection. The control regionsare used to constrain the
                      kinematic properties of B → Xcℓν decays based on data
                      and thereforereduce the dependence of the measurement on
                      their modelling. The partial branching fractionmeasured for
                      lepton energies greater than 1 GeV in the signal B meson
                      rest frame is∆B(B → Xuℓν) = (1.54 ± 0.08 ± 0.12) ×
                      10−3,where the uncertainties are statistical and
                      systematic, respectively. From this measurement,using the
                      Gambino, Giordano, Ossola and Uraltsev theoretical
                      framework, the strength of thebeauty-to-up quark coupling is
                      determined to be|Vub| = (4.01 ± 0.19+0.07−0.08) ×
                      10−3,where the uncertainties are experimental and
                      theoretical, respectively. This value is in goodagreement
                      with the world average of |Vub| = (4.06±0.16)×10−3.
                      Different theoretical predictionsand partial branching
                      fractions measured in other phase-space regions, defined by
                      additionalselections on the Xu and leptonic system masses,
                      are also used to determine |Vub|.},
      cin          = {BELLE},
      cid          = {I:(DE-H253)BELLE-20210408},
      pnm          = {611 - Fundamental Particles and Forces (POF4-611)},
      pid          = {G:(DE-HGF)POF4-611},
      experiment   = {EXP:(DE-H253)AXSIS-20200101},
      typ          = {PUB:(DE-HGF)11},
      urn          = {urn:nbn:de:gbv:18-ediss-131188},
      doi          = {10.3204/PUBDB-2025-04127},
      url          = {https://bib-pubdb1.desy.de/record/638646},
}