First observation of heavy baryons and
Collaboration
8 pages
Published in:
- Phys.Rev.Lett. 99 (2007) 202001
e-Print:
- 0706.3868 [hep-ex]
Report number:
- FERMILAB-PUB-07-318-E
Experiments:
Citations per year
Abstract: (arXiv)
We report an observation of new bottom baryons produced in proton-antiproton collisions at the Tevatron. Using 1.1 fb^{-1} of data collected by the CDF II detector, we observe four \Lambda_b^0\pi^{\pm} resonances in the fully reconstructed decay mode \Lambda_b^0 \to \Lambda_c^+ \pi^-, where \Lambda_c^+ \to p K^- \pi^+. We interpret these states as the \Sigma_b^{(*)\pm} baryons and measure their masses to be: m_{\Sigma_b^+} = 5807.8^{+2.0}_{-2.2} (stat.) \pm 1.7 (syst.) MeV/c^2 m_{\Sigma_b^-} = 5815.2 \pm 1.0 (stat.) \pm 1.7 (syst.) MeV/c^2 m_{\Sigma_b^{*+}} = 5829.0^{+1.6}_{-1.8} (stat.) ^{+1.7}_{-1.8} (syst.) MeV/c^2 m_{\Sigma_b^{*-}} = 5836.4 \pm 2.0 (stat.) ^{+1.8}_{-1.7} (syst.) MeV/c^2Note:
- 8 Pages, 2 Figures, 2 Tables. Submitted to Phys. Rev. Lett
- 14.20.Mr
- 13.30.Eg
- anti-p p: colliding beams
- anti-p p: inclusive reaction
- Sigma/b: hadroproduction
- Sigma/b: excited state
- Sigma/b: hadronic decay
- mass spectrum: (Lambda/b0 pi)
- Lambda/b0: hadronic decay
- mass spectrum: (Lambda/c+ pi-)
References(38)
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