Observation of the Heavy Baryons {sigma}{sub b} and {sigma}{sub b}*

Journal Article · Fri Nov 16 04:00:00 EST 2007 · Physical Review Letters

DOI:https://doi.org/10.1103/PHYSREVLETT.99.202001· OSTI ID:21024466

Aaltonen, T; Maki, T; Mehtala, P; Orava, R; Osterberg, K; Saarikko, H; Remortel, N van ^[1]; Abulencia, A; Budd, S; Ciobanu, C I; Errede, D; Errede, S; Gerberich, H; Grundler, U; Junk, T R; Kraus, J; Marino, C P; Pitts, K; Rogers, E; Taffard, A ^[2]

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1. Division of High Energy Physics, Department of Physics, University of Helsinki and Helsinki Institute of Physics, FIN-00014, Helsinki (Finland)
2. University of Illinois, Urbana, Illinois 61801 (United States)

We report an observation of new bottom baryons produced in pp collisions at the Tevatron. Using 1.1 fb{sup -1} of data collected by the CDF II detector, we observe four {lambda}{sub b}{sup 0}{pi}{sup {+-}} resonances in the fully reconstructed decay mode {lambda}{sub b}{sup 0}{yields}{lambda}{sub c}{sup +}{pi}{sup -}, where {lambda}{sub c}{sup +}{yields}pK{sup -}{pi}{sup +}. We interpret these states as the {sigma}{sub b}{sup (*){+-}} baryons and measure the following masses: m{sub {sigma}{sub b}{sup +}}=5807.8{sub -2.2}{sup +2.0}(stat.){+-}1.7(syst.) MeV/c{sup 2}, m{sub {sigma}{sub b}{sup -}}=5815.2{+-}1.0(stat.){+-}1.7(syst.) MeV/c{sup 2}, and m({sigma}{sub b}*)-m({sigma}{sub b})=21.2{sub -1.9}{sup +2.0}(stat.){sub -0.3}{sup +0.4}(syst.) MeV/c{sup 2}.

• OSTI ID: 21024466
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 20 Vol. 99; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

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