Extrapolating SU(3) breaking from D to B decays

Michael Gronau; Dan Pirjol

doi:10.1103/PhysRevD.62.077301

Extrapolating SU(3) breaking from D to B decays

Michael Gronau
, Dan Pirjol

School of Business

Technion-Israel Institute of Technology

Research output: Contribution to journal › Article › peer-review

10 Scopus citations

Abstract

We consider two SU(3) breaking parameters R₁(m_B) and R₂(m_B) appearing in a relation between B⁺ →Kπ and B⁺→ππ amplitudes, which plays an important role in determining the weak phase γ. In the heavy quark limit, we identify an isospin-related quantity R₂(m_D) measured in D decays, exhibiting large SU(3) breaking which is likely due to nonfactorizable effects. Applying heavy quark symmetry to semileptonic D and B decay form factors, we find that factorizable SU(3) breaking in R₂(m_B)/R₁(m_B) may be significantly larger than estimated from certain model calculations of form factors.

Original language	English
Article number	077301
Pages (from-to)	1-4
Number of pages	4
Journal	Physical Review D - Particles, Fields, Gravitation and Cosmology
Volume	62
Issue number	7
DOIs	https://doi.org/10.1103/PhysRevD.62.077301
State	Published - 1 Oct 2000

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abstract = "We consider two SU(3) breaking parameters R1(mB) and R2(mB) appearing in a relation between B+ →Kπ and B+→ππ amplitudes, which plays an important role in determining the weak phase γ. In the heavy quark limit, we identify an isospin-related quantity R2(mD) measured in D decays, exhibiting large SU(3) breaking which is likely due to nonfactorizable effects. Applying heavy quark symmetry to semileptonic D and B decay form factors, we find that factorizable SU(3) breaking in R2(mB)/R1(mB) may be significantly larger than estimated from certain model calculations of form factors.",

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AB - We consider two SU(3) breaking parameters R1(mB) and R2(mB) appearing in a relation between B+ →Kπ and B+→ππ amplitudes, which plays an important role in determining the weak phase γ. In the heavy quark limit, we identify an isospin-related quantity R2(mD) measured in D decays, exhibiting large SU(3) breaking which is likely due to nonfactorizable effects. Applying heavy quark symmetry to semileptonic D and B decay form factors, we find that factorizable SU(3) breaking in R2(mB)/R1(mB) may be significantly larger than estimated from certain model calculations of form factors.

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Extrapolating SU(3) breaking from D to B decays

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