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Observation of the Heavy Baryons Σb and Σb*

CollaborationWith : Campanelli, Mario / Clark, Allan Geoffrey / Hamilton, Andrew / Lefevre, Régis / Moed, Shulamit / Sfyrla, Anna / Shreyber, Irina / Vallecorsa, Sofia / Wu, Xin
Published in Physical Review Letters. 2007, vol. 99, no. 20, p. 202001
Abstract We report an observation of new bottom baryons produced in pp collisions at the Tevatron. Using 1.1  fb−1 of data collected by the CDF II detector, we observe four Λ0bπ± resonances in the fully reconstructed decay mode Λ0b→Λ+cπ−, where Λ+c→pK−π+. We interpret these states as the Σ(*)±b baryons and measure the following masses: mΣ+b=5807.8+2.0−2.2(stat.)±1.7(syst.)  MeV/c2, mΣ−b=5815.2±1.0(stat.)±1.7(syst.)  MeV/c2, and m(Σ∗b)−m(Σb)=21.2+2.0−1.9(stat.)+0.4−0.3(syst.)  MeV/c2.
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CDF COLLABORATION. Observation of the Heavy Baryons Σb and Σb*. In: Physical Review Letters, 2007, vol. 99, n° 20, p. 202001. https://archive-ouverte.unige.ch/unige:38432

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Deposited on : 2014-07-03

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