000001617 001__ 1617
000001617 005__ 20190813134345.0
000001617 037__ $$aBELLE2-TALK-CONF-2019-096
000001617 041__ $$aeng
000001617 088__ $$aBELLE2-TALK-DRAFT-2019-088
000001617 100__ $$aWilliam Sutcliffe
000001617 245__ $$aSemileptonic and missing energy results from early Belle II data
000001617 260__ $$aEPS-HEP2019$$c2019-07-12
000001617 300__ $$amult. p
000001617 500__ $$a20 min
000001617 520__ $$aThe Belle II experiment at the SuperKEKB energy-asymmetric e+e− collider is a substantial upgrade of the B factory facility at the Japanese KEK laboratory. The design luminosity of the machine is 8×1035 cm−2s−1 and the Belle II experiment aims to record 50 ab−1 of data, a factor of 50 more than its predecessor. From February to July 2018, the machine has completed a commissioning run, achieved a peak luminosity of 5.5×1033 cm−2s−1, and Belle II has recorded a data sample of about 0.5 fb−1. Main operation of SuperKEKB has started in March 2019. In this presentation we show first results from studying missing energy signatures, such as leptonic and semileptonic B meson decays based on early Belle II data. We report first studies on re-measuring important standard candle processes, such as the abundant inclusive B→Xℓν and B→D∗ℓν decays. Furthermore, we will also present an overview of the semileptonic B decays that will be measured in the upcoming years at Belle II and discuss prospects for important B-anomalies like R(D) and R(D*), as well as other tests of lepton flavor universality. Early physics goals of the Belle II physics program are also to rediscover rare B decays. Especially radiative b→sγ decays can be measured on a small dataset and in the near future Belle II can provide independent tests of anomalies in b→sℓℓ decays. Ultimately, the clean Belle II environment will allow to study modes with large missing energy such as B→K∗νν¯.
000001617 8560_ $$fdoris.yangsoo.kim@desy.de
000001617 8564_ $$uhttps://docs.belle2.org/record/1617/files/BELLE2-TALK-CONF-2019-096.pdf