Measurement of Upper Limits for Upsilon --> gamma + R Decays

Details Measurement of Upper Limits for Upsilon --> gamma + R Decays Measurement of Upper Limits for Upsilon --> gamma + R Decays

2007-04-20

arxiv.org/abs/0704.2773v1

Phys.Rev.D76:117102,2007

Physics

High Energy Physics

High Energy Physics - Experiment

15 pages postscript,also available through http://www.lns.cornell.edu/public/CLNS/2006/, Submitted to PRD

Scientific paper

10.1103/PhysRevD.76.117102

Motivated by concerns regarding possible two-body contributions to the recently-measured inclusive Upsilon(nS)->gamma+X (n=1, 2, 3) direct photon spectra, we report on a new study of exclusive radiative decays of these narrow Upsilon(nS) resonances into two-body final states R+gamma, with R a narrow resonant hadronic state decaying into four or more charged particles. Such two-body processes are not explicitly addressed in the extant theoretical frameworks used to calculate the inclusive direct photon spectra, and must also be explicitly inserted into Monte Carlo simulations. Using data collected from the CLEO III detector at the Cornell Electron Storage Ring, we present upper limits of order 0.01 per cent for such bottomonium two-body decays as a function of the R recoil mass.

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