Abstract
We have used the Columbia University--Stony Brook detector at the Cornell Electron Storage Ring to study the decays of UPSILON(1S) and UPSILON(3S) resonances into a single photon plus a long-lived noninteracting particle. We obtain an upper limit on the branching ratio for UPSILON(1S)..--> gamma..+X, where X is undetected. This upper limit is 3.5 x 10/sup -4/ (90% C.L.) for masses m/sub X/ less than 7 GeV. For the UPSILON(3S) the upper limit is 1.2 x 10/sup -4/ (90% C.L.) for masses less than 4 GeV. Also, the product of the branching ratios of UPSILON..--> gamma..+axion and J/psi..--> gamma..+axion is calculated to be 0.6 x 10/sup -9/, inconsistent with theoretical predictions.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
