A Search for Bottomonium-like Resonances at the Collider Detector at Fermilab

The Belle experiment recently reported evidence for two bottomonium-like charged resonances, \(Z_b^+(10610)\) and \(Z_b^+(10650)\), observed in decays from the \(\Upsilon(5S)\). We present a search for these resonances in CDF data. In contrast to the Belle observation, we search for \(Z_b\) states directly produced in \(p\bar{p}\) collisions and decaying to an \(\Upsilon(1S, 2S, 3S)\) plus a charged pion. Since such a state must both be charged and contain a bottom and an anti- bottom quark, it would indicate a new hadronic state, for example, a tetraquark state. Starting from a sample of \(\Upsilon(1S, 2S, 3S)\) candidates selected by their decay to \(\mu^+\mu^-\), we add a pion and search for the \(Z_b\) resonances. We check the sensitivity by reconstructing \(\Upsilon(2S, 3S) \to \Upsilon(1S)\mu^+\mu^-\) decay.