Latest Results on Bottom Spectroscopy and Production with CDF

Using data collected with the CDF Run II detector, new measurements on bottom production cross-sections are presented. The latest achievements in bottom hadron spectroscopy are discussed. The results are based on a large sample of semileptonic and hadronic decays of bottom states made available by triggers based on the precise CDF tracking system. 1 First Observation of the Baryons Σb and Σ ∗ b in CDF The bottom Σ (∗) b states decay strongly into Λb by emitting soft pion as shown in Figure 1. Our results are based on data collected with the CDF II detector [2] and corresponding to an integrated luminosity of ∼ 1.1 fb. The trigger used in this study is based on displaced tracks. It reconstructs with the central tracker a pair of pT > ∼ 2.0GeV/c tracks at Level 1 and enables secondary vertex selection at Level 2 requiring each of these tracks to have impact parameter measured by the CDF silicon detector SVX II larger than 120μm. The signals of Σ (∗)± b states were sought in the decay chain Σ (∗)± b → Λ 0 bπ ± soft, Λb → Λ + c π , Λc → pK π. To remove the contribution due to a mass resolution This talk [1] has been presented on behalf of the CDF Collaboration at a conference “Photon 2007”. Unless otherwise stated all references to the specific charge combination imply the charge conjugate combination as well. antisymm b[qq] symm b{qq} 2