Measurement of the Ratio of Branching Fractions B($B^+ \to J/\psi \pi^+$) /B($B^+ \to J/\psi K^+$)

Abulencia, A.

doi:10.1103/PhysRevD.79.112003

Measurement of the Ratio of Branching Fractions B($$B^+ \to J/\psi \pi^+$$) /B($$B^+ \to J/\psi K^+$$)

Journal Article · Fri Jun 01 04:00:00 EDT 2007 · Phys.Rev.D

DOI:https://doi.org/10.1103/PhysRevD.79.112003· OSTI ID:1847384

Abulencia, A.

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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Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States); Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)

Contributing Organization:: CDF

DOE Contract Number:: AC02-07CH11359

OSTI ID:: 1847384

Report Number(s):: FERMILAB-PUB-07-170-E; arXiv:0905.2146; oai:inspirehep.net:757570

Journal Information:: Phys.Rev.D, Journal Name: Phys.Rev.D Vol. 79

Country of Publication:: United States

Language:: English

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