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

Max-Planck-Institut für Physik
Technical University of Munich

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

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

Access to Document

10.1016/0370-2693(95)80018-S

Cite this

@article{c4239e87f73244fe9e5f7e7970d61d28,

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",

note = "Funding Information: * Supported by the German Bundesministerium for Forschung und Technologie under contract 06 TM 732 and by the CEC science project SC1-CT91-0729.",

year = "1995",

month = jan,

day = "5",

doi = "10.1016/0370-2693(95)80018-S",

language = "English",

volume = "341",

pages = "379--385",

journal = "Physics Letters B",

issn = "0370-2693",

publisher = "Elsevier B.V.",

number = "3-4",

}

TY - JOUR

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

AU - Buras, Andrzej J.

AU - Fleischer, Robert

N1 - Funding Information: * Supported by the German Bundesministerium for Forschung und Technologie under contract 06 TM 732 and by the CEC science project SC1-CT91-0729.

PY - 1995/1/5

Y1 - 1995/1/5

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.

UR - https://www.scopus.com/pages/publications/0000389671

U2 - 10.1016/0370-2693(95)80018-S

DO - 10.1016/0370-2693(95)80018-S

M3 - Article

AN - SCOPUS:0000389671

SN - 0370-2693

VL - 341

SP - 379

EP - 385

JO - Physics Letters B

JF - Physics Letters B

IS - 3-4

ER -

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

Abstract

Access to Document

Other files and links

Fingerprint

Cite this