arXiv subjects

The CLEO collaboration

Publications and source records attributed to The CLEO collaboration.

3 recordsLinked to original sources

arXiv1994

Semileptonic Branching Fraction of Charged and Neutral B Mesons

An examination of leptons in ${Υ(4S)}$ events tagged by reconstructed $B$ decays yields semileptonic branching fractions of $b_-=(10.1 \pm 1.8\pm 1.4)\%$ for charged and $b_0=(10.9 \pm 0.7\pm 1.1)\%$ for neutral $B$ mesons. This is the first measurement for charged $B$. Assuming equality of the charged and neutral semileptonic widths, the ratio $b_-/b_0=0.93 \pm 0.18 \pm 0.12$ is equivalent to the ratio of lifetimes. A postscript version is available through World-Wide-Web in http://w4.lns.cornell.edu/public/CLNS/1994

hep-ex↗

arXiv1994

A Measurement of the Branching Fraction ${\cal B} τ^+ \to h^- π^0 ν_τ$

Using data from the CLEO II detector at CESR, we measure ${\cal B}(τ^\pm\rightarrow h^\pmπ^0ν_τ)$ where $h^\pm$ refers to either $π^\pm$ or $K^\pm$. We use three different methods to measure this branching fraction. The combined result is ${\cal B}(τ^\pm\rightarrow h^\pmπ^0ν_τ) = 0.2587 \pm 0.0012 \pm 0.0042$, in good agreement with Standard Model predictions. This result, in combination with other precision measurements, reduces the significance of the one-prong problem in tau decays. A postscript version is available through World-Wide-Web in http://w4.lns.cornell.edu/public/CLNS/1994/

hep-ph↗

arXiv1994

Measurement of the Branching Fraction for D^+ \to K^- π^+ π^+

Using the CLEO-II detector at CESR we have measured the ratio of branching fractions, ${\cal B}(D^+\rightarrow K^- π^+ π^+)/{\cal B}(D^0 \rightarrow K^-π^+) = 2.35 \pm 0.16 \pm 0.16$. Our recent measurement of ${\cal B}(D^0 \rightarrow K^-π^+)$ then gives ${\cal B}(D^+\rightarrow K^- π^+ π^+) = (9.3 \pm 0.6 \pm 0.8)\%$.

hep-ph↗