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We consider two SU(3) breaking parameters, $R_1(m_B)$ and $R_2(m_B)$,appearing in a relation between $B^+\to K\pi$ and $B^+\to\pi\pi$ amplitudes,which plays an important role in determining the weak phase $\gamma$. Weidentify an isospin-related quantity $R_2(m_D)$ measured in $D$ decays,exhibiting large SU(3) breaking which is likely due to nonfactorizable effects.With a cautious remark about possible nonfactorizable SU(3) breaking in $B$decays, we proceed to calculate factorizable SU(3) breaking corrections.Applying heavy quark symmetry to semileptonic $D$ and B decay form factors, wefind that SU(3) breaking in $R_2(m_B)/R_1(m_B)$ may be significantly largerthan estimated from certain model calculations of form factors.Comment: 10 pages LaTe

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

Extrapolating SU(3) breaking from<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>D</mml:mi></mml:math>to<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>B</mml:mi></mml:math>decays

Extrapolating SU(3) breaking fromDtoBdecays