Search for narrow resonances below theΥmesons

Citations Over TimeTop 19% of 2005 papers

Abstract

We have investigated the invariant mass spectrum of dimuons collected by the CDF experiment during the 1992--1995 run of the Fermilab Tevatron collider to improve the limit on the existence of narrow resonances set by the experiments at the SPEAR ${e}^{+}{e}^{\ensuremath{-}}$ collider. In the mass range $6.3\ensuremath{-}9.0\text{ }\text{ }\mathrm{GeV}/{\mathrm{c}}^{2}$, we derive 90% upper credible limits to the ratio of the production cross section times muonic branching fraction of possible narrow resonances to that of the $\ensuremath{\Upsilon}(1S)$ meson. In this mass range, the average limit varies from 1.7 to 0.5%. This limit is much worse at the mass of $7.2\text{ }\text{ }\mathrm{GeV}/{\mathrm{c}}^{2}$ due to an excess of $250\ifmmode\pm\else\textpm\fi{}61$ events with a width consistent with the detector resolution.

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