A Measurement of the B0 --> J/psi pi+pi- Branching Fraction

Details A Measurement of the B0 --> J/psi pi+pi- Branching Fraction A Measurement of the B0 --> J/psi pi+pi- Branching Fraction

2002-03-26

arxiv.org/abs/hep-ex/0203034v1

Physics

High Energy Physics

High Energy Physics - Experiment

16 pages, 1 postscript figure, presented at the XXXVIIth Rencontres de Moriond on QCD and Hadronic Interactions

Scientific paper

We present a preliminary measurement of the branching fraction for the decay of the neutral $B$ meson into the final state J/$\psi\pi^+\pi^-$. The data set contains approximately 56 million $B\bar{B}$ pairs produced at the $\Upsilon(4S)$ resonance and recorded by the BaBar detector at the PEP-II $e^+e^-$ collider. The result of this analysis is $\mathcal{B}(B^0\to J/\psi\pi^+\pi^-$) = (5.0 $\pm$ 0.7 $\pm$ 0.6)$\times 10^{-5}$, where the first error is statistical and the second is systematic.

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