منابع مشابه
Heavy Light Weak Matrix Elements * Shep–96–21
In this review I will focus on calculations of selected matrix elements involving b quarks. The semileptonic decays B̄→πlν̄l and B̄→ρlν̄l depend on the CKM element Vub which fixes one side of the unitarity triangle. Lattice calculations open the possibility for a model independent extraction of this quantity. The rare radiative decay B̄→K∗γ is important for the determination of Vts and as a window o...
متن کاملLight Hadron Weak Matrix Elements
The kaon bag parameter BK , which is required for constraining the CP violation parameter in the Cabibbo-Kobayashi-Maskawa matrix from experiment, has been successfully calculated with the Kogut-Susskind(KS) quark action, taking advantage of its UA(1) chiral symmetry[1]. A recent systematic calculation of BK with high statistics[2], however, reveals that the systematic uncertainties in the pert...
متن کاملLight Hadron Weak Matrix Elements
Weak processes involving light hadrons in general, and kaons in particular, have contributed significantly to our understanding of fundamental interactions over the years. Most recently, the measurement of a non-vanishing Re ǫ/ǫ in K → ππ decays by KTeV [1] and NA48 [2] has provided unambiguous evidence for direct CP violation. In constraining the Standard Model (SM), the physics of kaons is co...
متن کاملLattice Results for Heavy Light Matrix Elements
Lattice results for heavy light matrix elements are reviewed and some of their implications are very briefly discussed [1]. Despite the fact that in most cases the lattice results for weak matrix elements at the moment have only a modest accuracy of about 20–30% they already have important phenomenological repercussions; e.g. for Vtd/Vts, xs/xd and B → K ∗γ. I. As samples of “new” projects, I b...
متن کاملHeavy-Quark Effective Theory and Weak Matrix Elements
Recent developments in the theory of weak decays of heavy flavours are reviewed. Applications to exclusive semileptonic B decays, the semileptonic branching ratio and charm counting, beauty lifetimes, and hadronic B decays are discussed. Invited talk presented at the International Europhysics Conference on High Energy Physics Jerusalem, Israel, 19–26 August 1997 CERN-TH/98-2 January 1998 19: He...
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ژورنال
عنوان ژورنال: Nuclear Physics B - Proceedings Supplements
سال: 1997
ISSN: 0920-5632
DOI: 10.1016/s0920-5632(96)00611-1