Title Search for narrow resonances lighter than $\Upsilon$ mesons Search for narrow resonances lighter than $\Upsilon$ mesons Author Aaltonen, T. Van Remortel, N. et al. Faculty/Department Faculty of Sciences. Physics Publication type article Publication 2009 Berlin , 2009 Subject Physics Source (journal) European physical journal : C : particles and fields. - Berlin Volume/pages 62(2009) :2 , p. 319-326 ISSN 1434-6044 Carrier E Target language English (eng) Full text (Publishers DOI) Affiliation University of Antwerp Abstract We report a search for narrow resonances, produced in $p\bar{p}$ collisions at $\sqrt{s}=1.96$ TeV, that decay into muon pairs with invariant mass between 6.3 and 9.0 GeV/c 2. The data, collected with the CDF II detector at the Fermilab Tevatron collider, correspond to an integrated luminosity of 630 pb−1. We use the dimuon invariant mass distribution to set 90% upper credible limits of about 1% to the ratio of the production cross section times muonic branching fraction of possible narrow resonances to that of the ϒ(1S) meson. Handle