scholarly journals B DECAYS ON THE LATTICE AND RESULTS FOR PHENOMENOLOGY

2005 ◽  
Vol 20 (16) ◽  
pp. 3651-3653
Author(s):  
MATTHEW WINGATE ◽  
CHRISTINE DAVIES ◽  
ALAN GRAY ◽  
EMEL GULEZ ◽  
JUNKO SHIGEMITSU ◽  
...  
Keyword(s):  
Monte Carlo ◽  
Monte Carlo Simulations ◽  
Form Factors ◽  
Matrix Elements ◽  
B Decays ◽  
Ckm Matrix ◽  
Decay Constants ◽  
Lattice Monte Carlo ◽  
Ckm Matrix Elements ◽  
Fermion Action

Lattice Monte Carlo simulations now include the effects of 2 light sea quarks and 1 strange sea quark through the use of an improved staggered fermion action. Consequently, results important to phenomenology are free of the approximate 10% errors inherent in the quenched approximation. This talk reports on calculations of the B and Bs, decay constants and B → πℓν form factors. Accurate determinations of these quantities will lead to tighter constraints on CKM matrix elements.

Semileptonic decays of D, B, K mesons and the full CKM matrix from unquenched lattice QCD

2005 ◽  
Vol 20 (15) ◽  
pp. 3469-3475 ◽  
Author(s):  
◽  
Masataka Okamoto
Keyword(s):  
Lattice Qcd ◽  
Form Factors ◽  
Semileptonic Decays ◽  
Experimental Result ◽  
Particle Data Group ◽  
Matrix Elements ◽  
Ckm Matrix ◽  
Ckm Matrix Elements ◽  
K Mesons ◽  
Data Group

We use lattice QCD to fully determine the CKM matrix. |Vcd|, |Vcs|, |Vub|, |Vcb| and |Vus| are, respectively, directly determined with our lattice results for form factors of semileptonic D → πlν, D → Klν, B → πlν, B → Dlν and K → πlν decays. The accuracy is comparable to that of the Particle Data Group averages. In addition, |Vud|, |Vtb|, |Vts| and |Vtd| are determined by using unitarity of the CKM matrix and the experimental result for sin (2β). In this way, we obtain all 9 CKM matrix elements, where the only theoretical input is lattice QCD.

LEPTONIC D AND DS DECAYS FROM CLEO-c AND PROSPECTS FOR BESIII

2011 ◽  
Vol 02 ◽  
pp. 97-101
Author(s):  
ROY A. BRIERE
Keyword(s):  
Lattice Qcd ◽  
Leptonic Decay ◽  
Meson Decay ◽  
Matrix Elements ◽  
Ckm Matrix ◽  
Decay Constants ◽  
Ckm Matrix Elements

We first review recent measurements of D → μν and Ds → μν, τν from CLEO-c. These decays are used to determine leptonic decay constants fD and fDs which may be compared to modern Lattice QCD (LQCD) calculations. Such cross-checks can provide confidence in Lattice results for B(s) meson decay constants which are needed to fully exploit data used to extract the CKM matrix elements Vub and Vcb. We also comment briefly on the outlook for further progress at BESIII.

scholarly journals GLOBAL FITS TO THE CABIBBO–KOBAYASHI–MASKAWA MATRIX: UNITARITY CONDITION METHOD VERSUS STANDARD UNITARITY TRIANGLES APPROACH

2005 ◽  
Vol 20 (23) ◽  
pp. 1709-1721 ◽  
Author(s):  
PETRE DITA
Keyword(s):  
Monte Carlo ◽  
Monte Carlo Simulations ◽  
Fine Tuning ◽  
Unitarity Condition ◽  
Matrix Elements ◽  
Unitarity Triangle ◽  
Simple Criterion ◽  
Ckm Matrix ◽  
Condition Method ◽  
Global Fit

The aim of the paper is to make a comparison between the unitarity condition method and the standard version of the unitarity triangle approach by using as parameters four independent moduli |Uij|. This choice is motivated by the measurability property and leads to a simple criterion for the separation of unistochastic matrices from the double stochastic ones, whose fulfillment is the key point of any global fit for the CKM entries. In our formulation both the methods are exact, do not depend on any assumption as the smallness of some parameter and both can be used to global fits in the quark and fermion sectors. Monte Carlo simulations show that the separation criterion puts very strong conditions requiring a fine tuning of all the CKM matrix elements.

Study of Radiative B Decay

1997 ◽  
Vol 12 (36) ◽  
pp. 2749-2755 ◽  
Author(s):  
H. Routh ◽  
V. P. Gautam
Keyword(s):  
Decay Width ◽  
Decay Process ◽  
Matrix Elements ◽  
B Decays ◽  
Ckm Matrix ◽  
Flavor Changing ◽  
Weak Annihilation ◽  
Ckm Matrix Elements ◽  
Inclusive Decay

Radiative B decays provide valuable information on some poorly known CKM matrix elements |Vtb| and |Vts|. So in our letter we propose to study the flavor changing radiative B decays corresponding to the inclusive b→ sγ and b→dγ decays. In this letter we discuss the radiative flavor changing B→ K**γ, Bs→ϕ;γ and the rare Bc→D*γ decays taking into account both the Penguin as well as weak annihilation contribution and it is found that weak annihilation contribution is negligible in case of decay of mesons consisting of light spectator, i.e. for B→K**γ and Bs→ϕ;γ but in case of decay of Bc→D*γ, weak annihilation contribution is the most dominating factor. It is also interesting to note that all the B→ K**γ, Bs→ϕ;γ and Bc→ D*γ decays have almost the same decay width because they have the same type of inclusive decay process b→ s(d)γ.

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