x / 05 06 08 0 v 3 7 A ug 2 00 5 Measurements of B Decays to Two Kaons
نویسندگان
چکیده
We report measurements of B meson decays to two kaons using 253 fb−1 of data collected with the Belle detector at the KEKB energy-asymmetric e+e− collider. We find evidence for signals in B+ → KK+ and B0 → K0K with significances of 3.0σ and 3.5σ, respectively. (Charge-conjugate modes included) The corresponding branching fractions are measured to be B(B+ → KK+) = (1.0 ± 0.4 ± 0.1) × 10−6 and B(B0 → K0K) = (0.8 ± 0.3 ± 0.1) × 10−6. These decay modes are examples of hadronic b → d transitions. No signal is observed in the decay B0 → K+K− and we set an upper limit of 3.7 × 10−7 at 90% confidence level. PACS numbers: 11.30.Er, 12.15.Hh, 13.25.Hw, 14.40.Nd
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تاریخ انتشار 2005