Search for the Decays B0 ---> D*+ D*-

Asner, D.M.; Bliss, D.W.; Brower, W.S.; Masek, G.; Paar, H.P.; Sharma, V.; Gronberg, J.; Kutschke, Robert K.; Lange, D.J.; Menary, Scott R.

doi:10.1103/PhysRevLett.79.799

Search for the Decays B0 ---> D+ D-

CLEO

Collaboration

Apr, 1997

12 pages

Published in:

Phys.Rev.Lett. 79 (1997) 799-803

e-Print:

hep-ex/9704014 [hep-ex]

DOI:

10.1103/PhysRevLett.79.799

PDG:

{{\mathit B}^{0}}

\rightarrow

{{\mathit D}^{*}{(2010)}^{+}}{{\mathit D}^{*}{(2010)}^{-}}

Report number:

SLAC-PUB-9789,
CLNS-97-1474,
CLEO-97-6

Experiments:

CESR-CLEO-II

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Abstract:

Using the CLEO-II data set we have searched for the Cabibbo-suppressed decays B~0 -> D~{(*)+} D~{(*)-}. For the decay B~0 -> D~{*+} D~{*-}, we observe one candidate signal event, with an expected background of 0.022 +/- 0.011 events. This yield corresponds to a branching fraction of Br(B~0 -> D~{*+} D~{*-}) = (5.3~{+7.1}_{-3.7}(stat) +/- 1.0(syst)) x 10~{-4} and an upper limit of Br(B~0 -> D~{*+} D~{*-}) < 2.2 x 10~{-3} at the 90% CL. For B~0 -> D~{*\pm} D~\mp and B~0 -> D~+ D~-, no significant excess of signal above the expected background level is seen, and we calculate the 90% CL upper limits on the branching fractions to be Br(B~0 -> D~{*\pm} D~\mp) < 1.8 x 10~{-3} and Br(B~0 -> D~+ D~-) < 1.2 x 10~{-3}.

Note:

12 page postscript file also available through http://w4.lns.cornell.edu/public/CLNS, submitted to Physical Review Letters Report-no: CLNS 97/1474 CLEO 97-6

electron positron: colliding beams
electron positron: annihilation
Upsilon(10570): electroproduction
B0: pair production
B0: hadronic decay
D*(2010)
B0: branching ratio
upper limit
CLEO
experimental results