The Study Of Quark Annihilation Operator's Hadron Matrix Element In B?PV

Using the method of QCD light-cone sum rule, we calculate the form factors of the B??? hadronic matrix elements in annihilation topology.In order to obtain the weak annihilation form factors, we construct a analytical correlation function of two quark currents sandwiched between the vacuum and on-shell pion-meson state in the space-like region at first.Then define the form factor and consider the ward identities ?conserved current? and parity conservation. We adopt the vector current ????_vq, the pseudoscalar current ????₅q, and the axial vector current ????_v?₅q as interpolating current to get the hadron representation of correlation function, respectively. Matching this relation to the result of QCD calculation, we retain only the pion contribution and replace the sum over heavier states by a quark-hadron duality estimate. After Borel transformation we obtain the LCSR for the B??? weak annihilation form factors valid at large space-like momentum Q²< 0 Analytically continuing the result to large time-like Q²=m_B²,we get the B??? weak annihilation form factors.