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When studying B decays within the Standard Model, it is customary to use theunitarity of the CKM matrix in order to write the decay amplitudes in terms ofonly two of the three weak phases which appear in the various diagrams.Occasionally, it is mentioned that those two weak phases can be used in orderto describe any decay amplitude, even beyond the Standard Model. Here we pointout that, when describing a generic decay amplitude, the two weak phases can bechosen completely at will, and we study the behavior of the decay amplitudesunder changes in the two weak phases chosen as a basis. Of course, physicalobservables cannot depend on such reparametrizations. This has an impact indiscussions of the SM and in attempts to parametrize new physics effects in thedecay amplitudes. We illustrate these issues by looking at B --> psi K_S andthe isospin analysis in B --> pi pi.Comment: 16 pages, RevTe

physical review. d. particles, fields, gravitation, and cosmology/physical review. d, particles, fields, gravitation, and cosmology

Reparametrization invariance of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>B</mml:mi></mml:math>decay amplitudes and implications for new physics searches in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>B</mml:mi></mml:math>decays

Reparametrization invariance ofBdecay amplitudes and implications for new physics searches inBdecays