Possible complex annihilation and B→Kπ direct CP asymmetry

Junegone Chay, Hsiang Nan Li, Satoshi Mishima

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

We point out that a strong phase from the penguin annihilation channel in B meson decays is sensitive to the treatment of subleading terms with physical b quark mass mb. In the limit of infinite heavy-quark mass, both the soft-collinear effective theory and the perturbative QCD approach based on the kT factorization theorem agree that the strong phase is suppressed. For finite heavy-quark mass, the two approaches predict different results, which are related to the treatment of subleading terms. This is illustrated by taking a toy model for soft-collinear effective theory, in which a small quantity, suppressed by O(Λ/mb), with Λ being a hadronic scale, is kept in the denominators of internal particle propagators. This model can generate a sizable strong phase to accommodate the data of the B0→K π± direct CP asymmetry.

Original languageEnglish
Article number034037
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volume78
Issue number3
DOIs
Publication statusPublished - 2008 Aug 29

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Annihilation
Asymmetry
Quarks
Collinear
asymmetry
quarks
Factorization Theorem
Denominator
Term
Propagator
factorization
Mesons
mesons
theorems
quantum chromodynamics
Decay
Internal
Predict
propagation
decay

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Nuclear and High Energy Physics
  • Mathematical Physics

Cite this

Possible complex annihilation and B→Kπ direct CP asymmetry. / Chay, Junegone; Li, Hsiang Nan; Mishima, Satoshi.

In: Physical Review D - Particles, Fields, Gravitation and Cosmology, Vol. 78, No. 3, 034037, 29.08.2008.

Research output: Contribution to journalArticle

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