Karlsruhe 2024 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 49: Flavour physics 2
T 49.6: Vortrag
Dienstag, 5. März 2024, 17:15–17:30, Geb. 30.41: HS 4
Direct measurement of R±0 at Belle II — Florian Bernlochner, Jochen Dingfelder, •Anna-Maria Heyn, and Markus Prim — Physikalisches Institut der Rheinischen Friedrich-Wilhelms-Universität Bonn
The ratio of the Υ(4S)→ B+B− and Υ(4S)→ B0B0 decay rates, R± 0, represents a crucial input quantity to convert measured yields into branching fractions at e+e− B-factory experiments. The most precise present day determinations rely on isospin assumptions. We present the status of a novel approach to determine the B± and B0 production fraction using an inclusive approach. It relies on analyzing the reconstructed number of charged tracks in a collision event. On average the decay of two B mesons results in about 10 charged final state particles and if perfectly reconstructed, the number of charged tracks from B± and B0 differ by two. In this talk, we explore the experimental feasibility to determine R± 0 from a careful analysis of the number of charged tracks in a collision event. Contributions from continuum processes are suppressed using multivariate methods and the template shapes on the number of charged tracks are determined using fully hadronic control channels of self-tagging decays.
Keywords: Experimental Flavor Physics; Belle II; Branching Fraction Measurements