Factorization approaches to B meson decays
نویسنده
چکیده
A(B → M1M2) ∝ φB ⊗H ⊗ φM1 ⊗ φM2 , (2) where ⊗ denotes the convolution over parton kinematic variables, the hard kernel H absorbs perturbative dynamics, and the B (M1, M2) meson distribution amplitude φB (φM1, φM2) absorbs nonperturbative dynamics in the B → M1M2 decay. A piece of contribution to B meson decays is factorizable, if it respects either Eq. (1) in the sense of the factorization assumption, or Eq. (2) in the sense of factorization theorem. Below we shall use the terms ”factorizable” and ”nonfactorizable” without specifying which sense it refers to.
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