SMuK 2023 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
T: Fachverband Teilchenphysik
T 78: Flavor VII
T 78.2: Vortrag
Mittwoch, 22. März 2023, 17:45–18:00, HSZ/0304
Studies of hadronic tag reconstruction and muon identification efficiency for B → Xu ℓ ν decays at the Belle II experiment — •Merle Graf-Schreiber1, Martin Angelsmark2, Florian Bernlochner2, Lu Cao1, Marcel Hohmann3, Munira Khan2, Tommy Martinov1, Kerstin Tackmann1, and Phillip Urquijo3 — 1DESY, Hamburg — 2Universität Bonn — 3University of Melbourne
The Belle II experiment is located at the SuperKEKB e+e− collider where it collects collision data around the Υ (4S) resonance, which primarily decays into BB pairs. The clean experimental environment of e+e− collisions enables us to study the inclusive B → Xu ℓ ν decay with good resolution, where Xu can be any charmless hadronic final state. The measurement of the partial branching fractions of this decay can be used to extract the Cabibbo-Kobayashi-Maskawa matrix element |Vub|, which is important for constraining the unitary triangle. In addition insights about the discrepancy between the |Vub| value measured in inclusive versus exclusive decays can be gained.
The lepton of the signal B decay and the second (tag) B meson of the Υ (4S) decay are crucial ingredients for reconstructing the kinematics of the Xu system and the undetected neutrino. The muon identification efficiency and its calibration to account for possible differences between data and simulation using the ee → µµγ process are going to be discussed in this talk. The tag B meson is reconstructed using a multivariate based tagging algorithm, the full event interpretation. The second part of this talk is going to focus on studying the tagging performance using variables related to the Btag meson.