Precision Determination of |v Ub |
نویسنده
چکیده
The last two years saw an impressive improvement in the determination of |Vub|, especially from inclusive decays. The error on inclusive |Vub| was reduced from 18% (PDG 2004) to 8% (PDG 2006). This progress is a result of a combined experimental and theoretical efforts. In this talk, the theoretical framework (BLNP) that enabled such progress is reviewed, as well as other approaches to inclusive determination of |Vub| (DGE, MX − q 2 etc.). The prospects of improving |Vub| are discussed, addressing issues of weak annihilation, implications of leptonic B decays, and exclusive determination of |Vub|.
منابع مشابه
Non - factorizable terms , heavy quark masses , and semileptonic decays of D and B mesons
Non-factorizable terms, heavy quark masses, and semileptonic decays of D and B mesons. Abstract The non-factorizable terms in the operator product expansion have been recognized as one of theoretical obstacles for precision determination of the mixing parameter V ub from semileptonic B decays. It is pointed out here that the recent CLEO data on the parameters of the heavy quark expansion λ 1 an...
متن کاملDetermination of |v Ub |
The element V ub of the CKM mixing matrix is the smallest of the quark couplings and is crucial in understanding CP violation in the B system. In this review, we discuss the present status of the determination of its magnitude, which involves a significant effort both experimentally and theoretically. Decisive progress has been achieved in recent years, thanks in part to the large data sets tha...
متن کاملSlac-pub-11543 Ckm Parameters and Rare B Decays
Measurements of the angles and sides of the unitarity triangle and of the rates of rare B meson decays are crucial for the precise determination of Standard Model parameters and are sensitive to the presence of new physics particles in the loop diagrams. In this paper the recent measurements performed in this area by BABAR and Belle will be presented. The direct measurement of the angle α is fo...
متن کاملDetermination of V ub at the Z – boson resonance
We show that the observation of energetic charged leptons from semileptonic b becays at the LEP and SLC Z–boson factories offers a unique opportunity to measure the quark mixing matrix element V ub. We present various distributions of the b decay products to show that the b → u decays can be cleanly separated from the b → c decays, with a signal of O(100) events per million Z bosons produced.
متن کامل