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2006-06-09

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Si us plau utilitzeu sempre aquest identificador per citar o enllaçar aquest document: https://hdl.handle.net/2445/131390

Measurement of branching fractions and CP-violating charge asymmetries for B-meson decays to D(*)¯¯¯D(*), and implications for the Cabibbo-Kobayashi-Maskawa angle γ

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https://doi.org/10.1103/PhysRevD.73.112004

Resum

We present measurements of the branching fractions and charge asymmetries of B decays to all D ( * ) ¯¯¯ D ( * ) modes. Using 232 × 10 6 B ¯¯¯ B pairs recorded on the Υ ( 4 S ) resonance by the BABAR detector at the e + e − asymmetric B factory PEP-II at the Stanford Linear Accelerator Center, we measure the branching fractions B ( B 0 → D * + D * − ) = ( 8.1 ± 0.6 ± 1.0 ) × 10 − 4 , B ( B 0 → D * ± D ∓ ) = ( 5.7 ± 0.7 ± 0.7 ) × 10 − 4 , B ( B 0 → D + D − ) = ( 2.8 ± 0.4 ± 0.5 ) × 10 − 4 , B ( B + → D * + ¯¯¯ D * 0 ) = ( 8.1 ± 1.2 ± 1.2 ) × 10 − 4 , B ( B + → D * + ¯¯¯ D 0 ) = ( 3.6 ± 0.5 ± 0.4 ) × 10 − 4 , B ( B + → D + ¯¯¯ D * 0 ) = ( 6.3 ± 1.4 ± 1.0 ) × 10 − 4 , and B ( B + → D + ¯¯¯ D 0 ) = ( 3.8 ± 0.6 ± 0.5 ) × 10 − 4 , where in each case the first uncertainty is statistical and the second systematic. We also determine the limits B ( B 0 → D * 0 ¯¯¯ D * 0 ) < 0.9 × 10 − 4 , B ( B 0 → D * 0 ¯¯¯ D 0 ) < 2.9 × 10 − 4 , and B ( B 0 → D 0 ¯¯¯ D 0 ) < 0.6 × 10 − 4 , each at 90% confidence level. All decays above denote either member of a charge-conjugate pair. We also determine the C P -violating charge asymmetries A ( B 0 → D * ± D ∓ ) = 0.03 ± 0.10 ± 0.02 , A ( B + → D * + ¯¯¯ D * 0 ) = − 0.15 ± 0.11 ± 0.02 , A ( B + → D * + ¯¯¯ D 0 ) = − 0.06 ± 0.13 ± 0.02 , A ( B + → D + ¯¯¯ D * 0 ) = 0.13 ± 0.18 ± 0.04 , and A ( B + → D + ¯¯¯ D 0 ) = − 0.13 ± 0.14 ± 0.02 . Additionally, when we combine these results with information from time-dependent C P asymmetries in B 0 → D ( * ) + D ( * ) − decays and world-averaged branching fractions of B decays to D ( * ) s ¯¯¯ D ( * ) modes, we find the Cabibbo-Kobayashi-Maskawa phase γ is favored to lie in the range (0.07-2.77) radians (with a + 0 or + π radians ambiguity) at 68% confidence level.

Matèries

Física de partícules, Experiments, Violació CP (Física nuclear), Mesons (Física nuclear)

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Particle physics, Experiments, CP violation (Nuclear physics), Mesons (Nuclear physics)

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Articles publicats en revistes (Física Quàntica i Astrofísica)

Citació

GRAUGÉS POUS, Eugeni and BABAR Collaboration. Measurement of branching fractions and CP-violating charge asymmetries for B-meson decays to D(*)¯¯¯D(*), and implications for the Cabibbo-Kobayashi-Maskawa angle γ. Physical Review D. 2006. Vol. 73, num. 11, pags. 112004. ISSN 1550-7998. [consulted: 16 of August of 2026]. Available at: https://hdl.handle.net/2445/131390

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