High Energy Photons in the Decay of the Upsilon.
This paper will report on the analysis of data obtained by the CUSB collaboration (SUNY Stony Brook, Columbia University, Louisiana State University, and the Max-Planck -Institut fur Physik und Astrophysik) at the Cornell Electron Storage Ring (CESR). A study was made of the decays of the Upsilon resonances into final states containing a high energy photon. A search was made for the production of monochromatic photons in exclusive channels, as well as broad enhancements in the photon spectrum. A measurement of the ratio of the widths (GAMMA)((UPSILON)(--->)(gamma)gg)/(GAMMA)((UPSILON)( --->)ggg) of 0.0237 (+OR-) 0.0024 for photons with z = 2E(,(gamma))/M(,(UPSILON)) > 0.5. A search for the radiative decay of the (UPSILON) to a glueball such as the i(1440) or (theta)(1640) was made and an upper limit to the branching ratio of 6 x 10(' -4) was calculated for each. Results are reported on the search for Higgs particle production in radiative (UPSILON) decay. An upper limit to the branching ratio as a function of the expected Higgs mass was calculated. A search for the axion was able to place an upper limit on the branching ratio B((UPSILON)(--->)(gamma) axion) of 3.5 x 10('-4), in disagreement with most popular theories.
- Pub Date:
- Physics: Elementary Particles and High Energy