Dortmund 2021 – scientific programme

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T: Fachverband Teilchenphysik

T 56: Flavour physics III

T 56.9: Talk

Wednesday, March 17, 2021, 18:00–18:15, Tf

Tagged analysis of B→ π ℓ ν at Belle — Florian Bernlochner, Jochen Dingfelder, •Jonathan Grumke, and Peter Lewis for the Belle collaboration — Physikalisches Institut, Bonn, Germany

We study the exclusive semileptonic decay B→ π ℓ ν, where ℓ is an electron or muon, with the Belle experiment at KEK in Tsukuba, Japan. From 1999 to 2010 Belle collected events from electron-positron collisions at a center-of-mass energy corresponding to the mass of the Υ(4S) resonance which almost always decays into a pair of B mesons. Events are tagged by fully reconstructing one B meson in a hadronic decay mode using the Full Event Interpretation algorithm. The remaining unassigned tracks are used to reconstruct the signal side B meson from a pion and lepton candidate. The hadronic B tagging allows for a precise reconstruction of the kinematics of the signal B meson and therefore a good signal-to-background ratio, but requires a large data set due to its small efficiency. In this talk, the general analysis strategy and status of the tagged B→ π ℓ ν analysis is presented.