Search for the CP-Violating Decays {upsilon}(4S){yields}B{sup 0}B{sup 0}{yields}J/{psi}K{sub S}{sup 0}+J/{psi}({eta}{sub c})K{sub S}{sup 0}
- High Energy Accelerator Research Organization (KEK), Tsukuba (Japan)
We report the first search for CP-violating decays of the {upsilon}(4S) using a data sample that contains 535x10{sup 6} {upsilon}(4S) mesons with the Belle detector at the KEKB asymmetric-energy e{sup +}e{sup -} collider. A partial reconstruction technique is employed to enhance the signal sensitivity. No significant signals were observed. We obtain an upper limit of 4x10{sup -7} at the 90% confidence level for the branching fractions of the CP violating modes, {upsilon}(4S){yields}B{sup 0}B{sup 0}{yields}J/{psi}K{sub S}{sup 0}+J/{psi}({eta}{sub c})K{sub S}{sup 0}. Extrapolating the result, we find that an observation with 5{sigma} significance is expected with a 30 ab{sup -1} data sample, which is within the reach of a future super B factory.
- OSTI ID:
- 21024487
- Journal Information:
- Physical Review Letters, Vol. 99, Issue 21; Other Information: DOI: 10.1103/PhysRevLett.99.211601; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA). Belle Collaboration; ISSN 0031-9007
- Country of Publication:
- United States
- Language:
- English
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