Download or read book Two Photon Production of Pion Pairs in Ee/sub /minus// Collisions at 29 GeV. written by and published by . This book was released on 1989 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We present a new measurement of the cross section for the process ee/sup −/ → e+e/sup /minus//?+?/sup /minus// at center-of-mass energy 29 GeV for invariant pion pair masses M/sub /phi//phi// between 350 MeV/c2 and 3.5 GeV/c2. For M/sub /pi//pi// above 2.1 GeV/c2, we find approximate agreement with the hard-scattering prediction of Brodsky and Lepage. In the low mass region, we observe the f2(1270), and measure its radiative width to be 3.15 /plus minus/ .04 /plus minus/ .39 keV. We also observe an enhancement in the /pi//sup +//pi//sup /minus// spectrum near 1 GeV. We hypothesize that it is the f0(975) and determine it's radiative width to be 0.29 /plus minus/ .07 /plus minus/ .12 keV. 48 refs.