Exclusive χ(2P) production in Υ{hooked}(3S) decay

California Institute of Technology
University of Oklahoma
San Diego University of California
Syracuse University
University of Minnesota Twin Cities
Santa Barbara University of California
Carnegie Mellon University
University of Rochester
Southern Methodist University
Lawrence University of Kansas
University of Florida
Ithaca College
Harvard University
University at Albany State University of New York
Cornell University
Purdue University
Ohio State University
Vanderbilt University
University of Colorado at Boulder

Abstract

Using the CsI calorimeter of the CLEO-II detector, we have studied exclusive radiative decays of the ϒ(3S) to the χ(2P) states where the final state consists of two photons and two leptons (e+e− or μ+μ−, from either the ϒ(1S) or ϒ(2S)). We observe and measure branching ratios for the J=2 and J=1χb(23PJ) states, and set upper limits for the J=0 state.