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In the present thesis I discuss the hard spectator interaction amplitude in B → ππ at NLO i.e. at O(α2 s). This special part of the amplitude, whose LO starts at O(αs), is defined in the framework of QCD factorization. QCD factorization allows to separate the shortand the long-distance physics in leading power in an expansion in ΛQCD/mb, where the short… (More)


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