منابع مشابه
At Large Recoil
We perform an analysis of the K∗ polarization states in the exclusive B meson decay B0 → K∗0(→ K−π+)l+l− (l = e, μ, τ) in the low dilepton mass region, where the final vector meson has a large energy. Working in the transversity basis, we study various observables that involve the K∗ spin amplitudes A⊥, A‖, A0 by exploiting the heavyto-light form factor relations in the heavy quark and large-EK...
متن کاملTwo-loop QCD corrections to semileptonic b decays at an intermediate recoil
We present complete O(αs) corrections to the decay b → clνl at the point where the invariant mass of the leptons √ q2 equals the c quark mass. We use this result, together with previously obtained corrections at the ends of the q2 spectrum, to estimate the total width of the semileptonic b → c decay with O(αs) accuracy, essential for the |Vcb| determination. Precise determination of the Cabibbo...
متن کاملAnalysis of B → K ∗ l + l − decays at large recoil
We study the exclusive decays of B → Kll within the framework of the perturbative QCD (PQCD). We obtain the form factors for the B → K transition in the large recoil region, where the PQCD for heavy B meson decays is reliable. We find that our results for the form factors at q = 0 are consistent with those from most of the other QCDmodels in the literature. Via the decay chain of B → K(Kπ)ll, w...
متن کاملHigher order 1/m corrections at zero recoil.
The general structure of the 1/m corrections at zero recoil is studied. The relevant matrix elements are forward matrix elements of local higher dimensional operators and their time ordered products with higher order terms from the Lagrangian. These matrix elements may be classified in a simple way and the analysis at the non recoil point for the form factor of heavy quark currents simplifies d...
متن کاملMoving NRQCD for B Form Factors at High Recoil
We derive the continuum and lattice tree-level moving NRQCD (mNRQCD) through order 1/m. mNRQCD is a generalization of NRQCD for dealing with hadrons with nonzero velocity uμ. The quark’s total momentum is written as P = Mu + k where k ≪ Mu is discretized and Mu is treated exactly. Radiative corrections to couplings on the lattice are discussed. mNRQCD is particularly useful for calculating B → ...
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ژورنال
عنوان ژورنال: Physical Review D
سال: 2008
ISSN: 1550-7998,1550-2368
DOI: 10.1103/physrevd.78.074029