Article,

Search for the \$0^&\#45;&\#45;\$ Glueball in \$\Upsilon(1S)\$ and \$\Upsilon(2S)\$ decays

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Physical Review D, (Jan 5, 2017)
DOI: 10.1103/physrevd.95.012001

Abstract

We report the first search for the \$J^PC=0^--\$ glueball in \$\Upsilon(1S)\$ and \$\Upsilon(2S)\$ decays with data samples of \$(102\pm2)\$ million and \$(158\pm4)\$ million events, respectively, collected with the Belle detector. No significant signals are observed in any of the proposed production modes, and the 90\% credibility level upper limits on their branching fractions in \$\Upsilon(1S)\$ and \$\Upsilon(2S)\$ decays are obtained. The inclusive branching fractions of the \$\Upsilon(1S)\$ and \$\Upsilon(2S)\$ decays into final states with a \$\chi\_c1\$ are measured to be \$\BR(\Upsilon(1S)\chi\_c1+ anything) = (1.900.43(stat.)0.14(syst.))10^-4\$ with an improved precision over prior measurements and \$\BR(\Upsilon(2S)\chi\_c1+ anything) = (2.240.44(stat.)0.20(syst.))10^-4\$ for the first time.

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