Measurement of Branching Fractions in B0 -> J/Psi pi+pi- Decay
K. Abe
Abstract
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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