000004503 001__ 4503
000004503 005__ 20240904150536.0
000004503 037__ $$aBELLE2-TALK-CONF-2024-116
000004503 041__ $$aeng
000004503 088__ $$aBELLE2-TALK-DRAFT-2024-123
000004503 100__ $$aCristina Martellini
000004503 245__ $$aRecent results from Belle and Belle II
000004503 260__ $$aXIII International Conference on New Frontiers in Physics$$c2024-08-26
000004503 300__ $$amult. p
000004503 520__ $$aThe Belle II experiment has collected 424 fb$^{-1}$ sample of $e^+e^-$ collisions produced by the asymmetric SuperKEKB collider, at a centre-of-mass energy equal to or near the mass of the $\Upsilon(4S)$ resonance. Ninety-percent of the sample is at the $\Upsilon(4S)$ resonance, which decays to $B$-meson pairs. The predecessor experiment, Belle, collected nearly 1~ab$^{-1}$ of data from 1999-2010, three-quarters of which was at the $\Upsilon(4S)$. From these $\Upsilon(4S)$ data, we have made measurements of rare $B$ decays and $C\!P$ violation, as well as searched for lepton-universality violation. Highlights include the first observation of $B\to K\nu\bar{\nu}$ and measurements of lepton-universality in semitauonic $B$ decays. In addition, we study charm hadron decays, tau decays and quarkonium, which are also produced in abundance at these energies. Using low multiplicity events, we search for dark sector particles and make measurements related to the anomalous magnetic moment of the muon.
000004503 8560_ $$fdjaffe@bnl.gov
000004503 8564_ $$uhttps://docs.belle2.org/record/4503/files/BELLE2-TALK-CONF-2024-116.pdf