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Published March 5, 2003 | Published
Journal Article Open

Measurement of the B^0 → J/ψπ^+π^− Branching Fraction


We present a measurement of the branching fraction for the decay of the neutral B meson into the final state J/ψπ+π−. The data set contains approximately 56 × 10^6 BB pairs produced at the Υ(4S)resonance and recorded with the BABAR detector at the PEP-II asymmetric-energy e^+e^− storage ring. The result of this analysis is B(B^0 → J/ψπ^+π^−)=(4.6 ± 0.7 ± 0.6) × 10^(−5), where the first error is statistical and the second is systematic. In addition, we measure B(B^0 → J/ψρ^0) = (1.6 ± 0.6 ± 0.4) × 10^(−5).

Additional Information

© 2003 American Physical Society. Received 7 September 2002; published 5 March 2003. We are grateful for the excellent luminosity and machine conditions provided by our PEP-II colleagues and for the substantial dedicated effort from the computing organizations that support BABAR. The collaborating institutions thank SLAC for its support and kind hospitality. This work is supported by DOE and NSF (USA), NSERC (Canada), IHEP (China), CEA and CNRS-IN2P3 (France), BMBF and DFG (Germany), INFN (Italy), NFR (Norway), MIST (Russia), and PPARC (United Kingdom). Individuals have received support from the A. P. Sloan Foundation, Research Corporation, and Alexander von Humboldt Foundation.

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Published - PhysRevLett.90.091801.pdf


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