J. Gronberg et al | Searcharxiv

arXiv1997

Measurements of the Meson-Photon Transition Form Factors of Light Pseudoscalar Mesons at Large Momentum Transfer

Using the CLEO~II detector, we have measured the differential cross sections for exclusive two-photon production of light pseudoscalar mesons $π^0$, $η$, and $η^{\prime}$. From our measurements we have obtained the form factors associated with the electromagnetic transitions $γ^*γ$ $\to$ meson. We have measured these form factors in the momentum transfer ranges from 1.5 to 9, 20, and 30 GeV$^2$ for $π^0$, $η$, and $η^{\prime}$, respectively, and have made comparisons to various theoretical predictions.

hep-ex↗

arXiv1995

Observation of the Isospin-Violating Decay $D_s^{*+}\to D_s^+π^0$

Using data collected with the CLEO~II detector, we have observed the isospin-violating decay $D_s^{*+}\to D_s^+π^0$. The decay rate for this mode, relative to the dominant radiative decay, is found to be $Γ(D_s^{*+}\to D_s^+π^0)/Γ(D_s^{*+}\to D_s^+γ)= 0.062^{+0.020}_{-0.018}\pm0.022$.

hep-ex↗