arXiv subjects

B. Nemati et al

Publications and source records attributed to B. Nemati et al.

2 recordsLinked to original sources

arXiv1997

Search for Color-Suppressed $B$ Hadronic Decay Processes with CLEO

Using 3.1 fb$^{-1}$ of data accumulated at the $Υ$(4S) by the CLEO-II detector, corresponding to 3.3 million $B\bar{B}$ pairs, we have searched for the color-suppressed $B$ hadronic decay processes: $\bar{B}^0 \to D^0 (D^{*0}) X^0$, where $X^0$ is a light neutral meson $π^0$, $ρ^0$, $η$, $η'$ or $ω$. No obvious signal is observed. We set 90 % C.L. upper limits on these modes, varying from $1.2 \times 10^{-4}$ for $\bar{B}^0 \to D^0 π^0$ to $1.9 \times 10^{-3}$ for $\bar{B}^0 \to D^{*0} η'$.

hep-ex↗

arXiv1996

Measurement of the Direct Photon Spectrum in $Υ(1S)$ Decays

Using data taken with the CLEO II detector at the Cornell Electron Storage Ring, we have determined the ratio of branching fractions: $R_γ \equiv Γ(Υ(1S) \rightarrow γgg)/Γ(Υ(1S) \rightarrow ggg) = (2.75 \pm 0.04(stat.) \pm 0.15(syst.))%$. From this ratio, we have determined the QCD scale parameter $Λ_{\overline{MS}}$ (defined in the modified minimal subtraction scheme) to be $Λ_{\overline{MS}}= 233 \pm 11 \pm 59$ MeV, from which we determine a value for the strong coupling constant $α_{s}(M_{Υ(1S)}) = 0.163 \pm 0.002 \pm 0.014$, or $α_{s}(M_{Z}) = 0.110 \pm 0.001 \pm 0.007$.

hep-ex↗