Measurement of Branching Fractions in B0 -> J/Psi pi+pi- Decay

Details Measurement of Branching Fractions in B0 -> J/Psi pi+pi- Decay Measurement of Branching Fractions in B0 -> J/Psi pi+pi- Decay

2004-08-23

arxiv.org/abs/hep-ex/0408107v1

Physics

High Energy Physics

High Energy Physics - Experiment

11 pages, 3 figures, submitted to to ICHEP2004, Beijing, China

Scientific paper

We report a measurement of the branching fractions in the B0->J/Psi pi+pi- decay based on a 140/fb data sample collected at the Upsilon(4S) energy with the Belle detector at the KEKB e+e- collider. Charged pion pairs are found to arise mainly from rho0 and f2 mesons; an upper limit for the non-resonant contribution is also set. The following branching fractions are obtained: Br(B0->J/Psi rho0)=(2.8+-0.3+-0.3)*10^{-5}, Br(B0->J/Psi f2)<1.5*10^{-5}(at 90% C.L.) and Br(B0->J/Psi (pi+pi-)non-res.)<1.5*10^{-5}(at 90% C.L.).

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