Dortmund 2021 – scientific programme
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T: Fachverband Teilchenphysik
T 56: Flavour physics III
T 56.2: Talk
Wednesday, March 17, 2021, 16:15–16:30, Tf
Investigation of B→ µ ν with inclusive tagging at Belle II — Florian Bernlochner, Jochen Dingfelder, Svenja Granderath, •Daniel Jacobi, and Peter Lewis for the Belle II collaboration — Physikalisches Institut der Rheinischen Friedrich-Wilhelms-Universität Bonn
BB meson pairs are the dominant decay products of the Υ(4S) resonance, which is produced in large amounts in e+e− collisions at the SuperKEKB collider in Japan, and their decays are measured by the Belle II experiment. Leptonic B meson decays, such as the investigated B→ µ ν decay, are highly suppressed, both due to Cabibbo-Kobayashi-Maskawa matrix element Vub and helicity arguments. In a two-body decay like B→ µ ν, the muon momentum is exactly known in the rest frame of the signal-side B meson. By boosting the signal-side muon into that frame, a better signal resolution and improved sensitivity can thus be achieved compared to the center-of-mass frame. This requires a high-precision boost vector, which can be determined by studying the rest of the event that contains the decay products of the second B meson. This indirectly reconstructs the signal-side B meson kinematics, since in the center-of-mass frame of the e+e− collision the B mesons are produced with equal energy and equal but opposite momentum. This talk will discuss the current status of the analysis and possible approaches toward improving the sensitivity of measuring B→ µ ν at Belle II.