Author/Authors :
J.M. Flynn، نويسنده , , J Nieves، نويسنده , , K.C Bowler، نويسنده , , N.M. Hazel، نويسنده , , D.S Hent، نويسنده , , I. Hoeber، نويسنده , , R.D Kenway، نويسنده , , D.G. Richards، نويسنده , , B.J. Gough، نويسنده , , L.P Lellouch، نويسنده , , H.P. Shanahan، نويسنده ,
Abstract :
We present results of a lattice computation of the vector and axial-vector current matrix elements relevant for the semileptonic decay B0 → ϱ+−vl. The computations are performed in the quenched approximation of lattice QCD on a 243 x 48 lattice at β = 6.2, using an O(a) improved fermionic action. Our principal result is for the differential decay rate, dΓ/dq2, for the decay B0 → ϱ+l−vl in a region beyond the charm endpoint, allowing a model-independent extraction of |Vub| from experimental measurements. Heavy quark symmetry relations between radiative and semileptonic decays of B mesons into light vector mesons are also discussed.
