Measurement of the Ratio of Branching Fractions Br(B+ -> JPsi pi+)/Br(B+ ->JPsi K+)

Details Measurement of the Ratio of Branching Fractions Br(B+ -> JPsi pi+)/Br(B+ ->JPsi K+) Measurement of the Ratio of Branching Fractions Br(B+ -> JPsi pi+)/Br(B+ ->JPsi K+)

2009-05-13

arxiv.org/abs/0905.2146v2

Phys.Rev.D79:112003,2009

Physics

High Energy Physics

High Energy Physics - Experiment

Scientific paper

10.1103/PhysRevD.79.112003

We report a measurement of the ratio of branching fractions of the decays B+ ->JPsi pi+ and B+ -> Jpsi K+ using the CDF II detector at the Fermilab Tevatron Collider. The signal from the Cabbibo-suppressed B+->JPsi pi+ decay is separated from B+->JPsi K+ using the invariant mass distribution and the kinematics differences of the hadron track in the two decay modes. From a sample of 220 pb^-1 of pbar-p collisions at sqrt(s)= 1.96 TeV, we observe 91 +- 15 B+->JPsi pi+ events together with 1883 +- 34 B+->JPsi K+ events. The ratio of branching fractions is found to be Br(B+ -> JPsi pi+)/Br(B+ ->JPsi K+) = (4.86 +- 0.82(stat.) +- 0.15(syst.)) %.

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