L.S. Wang

Search for the rare decays J / ψ → D s − π + , J / ψ → D − π + , and J / ψ → D ¯ 0 K ¯ 0

M. Ablikim, J. Z. Bai, Y. Ban, X. Cai et autres

Rare decay modes J/ψ→Ds−π++c.c., J/ψ→D−π++c.c., and J/ψ→D¯0K¯0+c.c. are searched for using 5.77×107J/ψ events collected with the BESII detector at the BEPC. No signal above background is observed. We present upper limits on the branching fractions of B(J/ψ→Ds−π+)<1.3×10−4, B(J/ψ→D−π+)<7.5×10−5, and B(J/ψ→D¯0K¯0)<1.7×10−4 at the …

cn, us (code pays fourni par la source)

Direct measurements of the branching fractions for inclusive K± and inclusive semileptonic decays of D+ and D0 mesons

M. Ablikim, J. Z. Bai, Y. Ban, X. Cai et autres

cn (code pays fourni par la source)

Measurements of the cross sections for e+e−→hadrons at 3.650, 3.6648, 3.773 GeV and the branching fraction for ψ(3770)→non-DD¯

J. Z. Bai, Y. Ban, J. G. Bian, X. Cai et autres

Using the BES-II detector at the BEPC Collider, we measured the lowest order cross sections and the R values (R=σe+e−→hadrons0/σe+e−→μ+μ−0) for inclusive hadronic event production at the center-of-mass energies of 3.650, 3.6648 and 3.773 GeV. The results lead to R¯uds=2.218±0.019±0.089 which is …

cn (code pays fourni par la source)