Extracting the CKM phase angle γ(≡ φ3) from isospin analysis in B → Kπ decay

Choong Sun Kim, Sechul Oh, Yeo Woong Yoon

Research output: Contribution to journalArticle

Abstract

We propose a new method to extract the CKM phase angle γ(≡ φ3) from the isospin analysis in B → Kπ decays only. Unlike previously proposed methods, we do not employ flavor SU(3) symmetry, so that this method is free from the hadronic uncertainty coming from the SU(3) breaking effect. Neither we adopt any Dalitz-plot analysis, which may involve multiple strong phases and large final state interactions. Since no theoretical assumption, except the isospin relations, is imposed on B → Kπ decays, this method will work well, regardless of possible new physics effects unless the isospin relations do not hold. Since the mixing induced CP asymmetry S KS π0 plays a crucial role in this method, more precise measurement on SKS π0 in future experiments will be greatly helpful to extract γ accurately. Using current experimental data for B → Kπ including SKS π0, we extract γ within 1σ: γ = 71-13°+0° or γ = 109-0°+57°.

Original languageEnglish
Pages (from-to)3300-3303
Number of pages4
JournalInternational Journal of Modern Physics A
Volume23
Issue number21
DOIs
Publication statusPublished - 2008 Aug 20

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phase shift
decay
plots
asymmetry
physics
symmetry
interactions

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics
  • Nuclear and High Energy Physics
  • Astronomy and Astrophysics

Cite this

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title = "Extracting the CKM phase angle γ(≡ φ3) from isospin analysis in B → Kπ decay",
abstract = "We propose a new method to extract the CKM phase angle γ(≡ φ3) from the isospin analysis in B → Kπ decays only. Unlike previously proposed methods, we do not employ flavor SU(3) symmetry, so that this method is free from the hadronic uncertainty coming from the SU(3) breaking effect. Neither we adopt any Dalitz-plot analysis, which may involve multiple strong phases and large final state interactions. Since no theoretical assumption, except the isospin relations, is imposed on B → Kπ decays, this method will work well, regardless of possible new physics effects unless the isospin relations do not hold. Since the mixing induced CP asymmetry S KS π0 plays a crucial role in this method, more precise measurement on SKS π0 in future experiments will be greatly helpful to extract γ accurately. Using current experimental data for B → Kπ including SKS π0, we extract γ within 1σ: γ = 71-13°+0° or γ = 109-0°+57°.",
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Extracting the CKM phase angle γ(≡ φ3) from isospin analysis in B → Kπ decay. / Kim, Choong Sun; Oh, Sechul; Yoon, Yeo Woong.

In: International Journal of Modern Physics A, Vol. 23, No. 21, 20.08.2008, p. 3300-3303.

Research output: Contribution to journalArticle

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