000000941 001__ 941
000000941 005__ 20180621120409.0
000000941 037__ $$aBELLE2-TALK-CONF-2018-063
000000941 041__ $$aeng
000000941 088__ $$aBELLE2-TALK-DRAFT-2018-047
000000941 100__ $$aMatic Lubej
000000941 245__ $$aDetermination of Vub and Vcb
000000941 260__ $$aCIPANP 2018$$c2018-05-30
000000941 300__ $$amult. p
000000941 500__ $$avub vcb determination exclusive inclusive ckm
000000941 520__ $$aSemileptonic decays of $B$ mesons involving low-mass charged leptons $e$ or $\mu$ are expected to be free of non-Standard Model contributions and therefore play a critical role in determinations of $\vert V_{cb} \vert$ and $\vert V_{ub} \vert$ ($\vert V_{qb} \vert$). Decays of the form $b \to c \ell \bar \nu_\ell$ and $b \to u \ell \bar \nu_\ell$ allow us to determine these matrix elements and test the CKM sector of the Standard Model. The theory underlying the determination of $\vert V_{qb} \vert$ is mature and experimental measurements are precise, however, the difference between exclusive and inclusive determinations persist even as the theoretical and experimental errors get smaller with more statistics, better theoretical calculations and more precise measurements. Of all the CKM matrix parameters, $\vert V_{ub} \vert$ is the least precise and in most need of additional studies in order to constrain the apex of the unitarity triangle even further. We present the procedures and latest results for exclusive and inclusive determinations of $\vert V_{qb} \vert$.
000000941 8560_ $$fdoris.yangsoo.kim@desy.de
000000941 8564_ $$uhttps://docs.belle2.org/record/941/files/BELLE2-TALK-CONF-2018-063.pdf