Limitations in measuring the angle β by using SU(3) relations for B-meson decay-amplitudes

Andrzej J. Buras; Robert Fleischer

doi:10.1016/0370-2693(95)80018-S

Limitations in measuring the angle β by using SU(3) relations for B-meson decay-amplitudes

Andrzej J. Buras, Robert Fleischer

Chair of Theoretical Elementary Particle Physics

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93 Scopus citations

Abstract

Flavour SU(3) symmetry of strong interactions and certain dynamical assumptions have been used in a series of recent publications to extract weak CKM phases from B-decays into {ππ, πK, K K ̄} final states. We point out that irrespectively of SU(3)-breaking effects the presence of QCD-penguin contributions with internal u- and c-quarks precludes a clean determination of the angle β in the unitarity triangle by using the branching ratios only. This difficulty can be overcome by measuring in addition the ratio x_d/x_s of B_d⁰- B ̄_d⁰ to B_s⁰- B ̄_s⁰ mixings. The measurement of the angle γ is unaffected by these new contributions. Some specific uncertainties related to SU(3)-breaking effects and electroweak penguin contributions are briefly discussed.

Original language	English
Pages (from-to)	379-385
Number of pages	7
Journal	Physics Letters B
Volume	341
Issue number	3-4
DOIs	https://doi.org/10.1016/0370-2693(95)80018-S
State	Published - 5 Jan 1995

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title = "Limitations in measuring the angle β by using SU(3) relations for B-meson decay-amplitudes",

abstract = "Flavour SU(3) symmetry of strong interactions and certain dynamical assumptions have been used in a series of recent publications to extract weak CKM phases from B-decays into {ππ, πK, K K{\= }} final states. We point out that irrespectively of SU(3)-breaking effects the presence of QCD-penguin contributions with internal u- and c-quarks precludes a clean determination of the angle β in the unitarity triangle by using the branching ratios only. This difficulty can be overcome by measuring in addition the ratio xd/xs of Bd0- B{\= }d0 to Bs0- B{\= }s0 mixings. The measurement of the angle γ is unaffected by these new contributions. Some specific uncertainties related to SU(3)-breaking effects and electroweak penguin contributions are briefly discussed.",

author = "Buras, {Andrzej J.} and Robert Fleischer",

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T1 - Limitations in measuring the angle β by using SU(3) relations for B-meson decay-amplitudes

AU - Buras, Andrzej J.

AU - Fleischer, Robert

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N2 - Flavour SU(3) symmetry of strong interactions and certain dynamical assumptions have been used in a series of recent publications to extract weak CKM phases from B-decays into {ππ, πK, K K ̄} final states. We point out that irrespectively of SU(3)-breaking effects the presence of QCD-penguin contributions with internal u- and c-quarks precludes a clean determination of the angle β in the unitarity triangle by using the branching ratios only. This difficulty can be overcome by measuring in addition the ratio xd/xs of Bd0- B ̄d0 to Bs0- B ̄s0 mixings. The measurement of the angle γ is unaffected by these new contributions. Some specific uncertainties related to SU(3)-breaking effects and electroweak penguin contributions are briefly discussed.

AB - Flavour SU(3) symmetry of strong interactions and certain dynamical assumptions have been used in a series of recent publications to extract weak CKM phases from B-decays into {ππ, πK, K K ̄} final states. We point out that irrespectively of SU(3)-breaking effects the presence of QCD-penguin contributions with internal u- and c-quarks precludes a clean determination of the angle β in the unitarity triangle by using the branching ratios only. This difficulty can be overcome by measuring in addition the ratio xd/xs of Bd0- B ̄d0 to Bs0- B ̄s0 mixings. The measurement of the angle γ is unaffected by these new contributions. Some specific uncertainties related to SU(3)-breaking effects and electroweak penguin contributions are briefly discussed.

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ER -

Limitations in measuring the angle β by using SU(3) relations for B-meson decay-amplitudes

Abstract

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