Through the simultaneous measurement of the transverse size as a function of longitudinal position, and the longitudinal distribution of luminosity, we are able to measure the β * y (vertical envelope function at the collision point), vertical emittance, and bunch length of colliding beams at the Cornell Electron-positron Storage Ring (CESR). This measurement is possible due to the significant "hourglass" effect at CESR and the excellent tracking resolution of the CLEO detector.

We have developed techniques that allow simultaneous measurements of the spatial size of the luminous region and the angular spread of the · · events from the CLEO interaction point of the Cornell ElectronPositron Storage Ring, CESR. These techniques take advantage of the small and well understood resolution of the CLEO tracking system. We use these measurements to extract the horizontal beta, horizontal emittance and the vertical emittance as functions of specific luminosity.