B → πlν Decay and |Vub|
نویسندگان
چکیده
B → πlν decay is studied in the effective theory of heavy quark with infinite mass limit. The leading order heavy flavor-spin independent universal wave functions which parameterize the relevant matrix elements are evaluated via light cone sum rule method in the effective theory. The important quark mixing matrix element |V ub | is then extracted via B → πlν decay mode.
منابع مشابه
Further remarks on the isospin breaking in charmless semileptonic B decays
We consider the isospin breaking corrections to charmless semileptonic decays of B mesons. Both, the recently measured branching ratios of exclusive decays by the CLEO Collaboration and the end-point region of the inclusive lepton spectrum in form factor models, can be affected by these corrections. Isospin corrections can affect the determination of |Vub| from exclusive semileptonic B decays a...
متن کاملLattice Determination of Semileptonic Form Factors
Computation of the semileptonic form factors for B → π(ρ)lν, B → D(∗)lν and B → K(∗)l+l− decays is a key to the determination of the CKM matrix elements |Vub|, |Vcb| and |Vts| . In this report, I review the recent results by lattice QCD methods. I will mainly focus on the semileptonic decay B → πlν, because lattice calculations in various approaches are already at hand [ 1, 2, 3, 4, 5] and beca...
متن کاملThe Semileptonic Decays B → πlν and D → πlν from Lattice QCD Aida
We present a lattice QCD calculation of the form factors and differential decay rates for semileptonic decays of the heavy-light mesons B and D to the final state πlν. The results are obtained with three methodological improvements over previous lattice calculations: a matching procedure that reduces heavyquark lattice artifacts, the first study of lattice-spacing dependence, and the introducti...
متن کامل02 02 2 v 1 1 2 Fe b 20 07 Semileptonic b to u transition Contribution to the proceedings of HQL 06 , Munich , October 16 th - 20 th 2006
The parameter |Vub| is one of the smallest and least known elements of the CabibboKobayashi-Maskawa (CKM) quark-mixing matrix. A precise determination of |Vub| would significantly improve the constraints on the unitarity triangle and provide a stringent test of the Standard Model mechanism for CP violation. With the CKM angle φ3, |Vub| can constrain the unitarity triangle from tree level proces...
متن کامل|Vub| and Constraints on the Leading-Twist Pion Distribution Amplitude from B → πlν
Using new experimental data on the leptonic mass spectrum of B → πlν, we simultaneously determine |Vub| and constrain a π 2 and a π 4 , the first two Gegenbauer moments of the pion’s leading-twist distribution amplitude. We find |Vub| = (3.2 ± 0.1 ± 0.1 ± 0.3) × 10 , where the first error is experimental, the second comes from the shape of the form factor in q and the third is a 8% uncertainty ...
متن کامل