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CP asymmetry and branching ratio of B ---> pi pi

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Kou, E. [UCL] Pham, T.N.

(eng) We investigate the branching ratios and CP asymmetries of the B -> pi pi processes measured in B factory experiments. Fits to the experimental data of this process indicate a large ratio of color-suppressed (C) to color-allowed (T) tree contributions. We investigate whether the large C/T can be explained within the QCD based model computation with i) a large effect from the end-point singularity or with ii) large final-state-interaction phase between two different isospin amplitudes. We show that the current experimental data do not exclude either possibility but we may be able to distinguish these two effects in future measurements of direct CP asymmetry of B -> pi^0 pi^0. Comment: 8 pages, 10 figures

Document type Article de périodique (Journal article)
Publication date 2006
Journal information "Physical Review D, Particles, Fields, Gravitation and Cosmology" - Vol. D74, p. 014010 (2006)
Publisher American Physical Society (Maryland)
issn 1550-7998
e-issn 1550-2368
Publication status Publié
Affiliation UCL
Keywords High Energy Physics - Phenomenology
Links
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Bibliographic reference Kou, E. ; Pham, T.N.. CP asymmetry and branching ratio of B ---> pi pi. In: Physical Review D, Particles, Fields, Gravitation and Cosmology, Vol. D74, p. 014010 (2006)
Permanent URL http://hdl.handle.net/2078/31056