Particle Physics Seminar: A tale of two-leptons

Abstract:

In this talk, we present recent highlights from the Belle and Belle II experiments on B-meson decays to final states including a pair of leptons, discuss their implications and future prospects.  The Belle II is an $e^+ e^-$ collision experiment using the SuperKEKB collider at KEK, Japan and is the successor of the Belle experiment. We discuss, with $\ell^+ \nu$, the recent issues with lepton universality violations (LUV) in $R(D^{(*)}$ and intriguing tensions in $V_{cb}$, $V_{ub}$ measurements.  With $\ell^+ \ell^-$, we explore lepton flavor violation (LFV), LUV and other hints for new physics.  We also present searches for dark photons or other neutral gauge bosons that might decay to $\ell^+ \ell^-$.  Finally with $\nu \overline{\nu}$, we talk about invisible and semi-invisible $B$ and $D$ decays.  These invisible and semi-invisible decays also have implications for dark sector search.

Seminar Organizer: Dr. Adi Ashkanzi