Title: Measurements of semi-leptonic decays at Belle and Belle II

Speaker: Dr. Frank Meier, Duke University

Abstract: The Standard Model of particle physics (SM) has been completed with the observation of the Higgs boson in 2012. However, many questions like the explanation for the large matter-antimatter asymmetry observed in today's universe or the hierarchy problem remain unanswered. The Belle II experiment at the SuperKEKB electron-positron collider at KEK aims at providing new insights into these and other questions by performing indirect searches for physics beyond the SM in the electro-weak sector. The kinematic constraints from the well-defined initial state are especially advantageous in semi-leptonic decays with missing energy and allow a much better sensitivity than experiments at hadron colliders.

In my presentation, I will show the latest results by Belle and Belle II for measurements of semi-leptonic decays. Additionally, prospects for future precision will be given.