Evidence for a bottom baryon resonance Lambda_b* in CDF data

Journal article

Using data from proton-antiproton collisions at Ecms=1.96 TeV recorded by the CDF II detector at the Fermilab Tevatron, evidence for the excited resonance state Lambda_b* is presented in its Lambda_b0 pi+ pi- decay, followed by the Lambda_b0 -->Lambda_c+ (-->proton K- pi+) pi- decays. The analysis is based on a data sample corresponding to an integrated luminosity of 9.6/fb collected by an online event selection based on charged-particle tracks displaced from the proton-antiproton interaction point. The significance of the observed signal is 3.5 Gaussian sigmas. The mass of the observed state is found to be 5919.22 +- 0.76 MeV in agreement with similar findings in proton-proton collision experiments.

Authors: Collaboration, CDF; Aaltonen, T; Amerio, S; Amidei, D; Anastassov, A

• Publication status: Published
• Journal: Phys. Rev. D
• Volume: 88
• Issue: 7
• Pages: 071101
• Publication date: 2013-08-08
• DOI: 10.1103/PhysRevD.88.071101
• EISSN: 1550-2368
• ISSN: 1550-7998
• Language: English
• Keywords: hep-ex