Observation of the Heavy Baryons Sigma b and Sigma b*.

Journal article

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 Lambda b 0 pi+/- resonances in the fully reconstructed decay mode Lambda b 0-->Lambda c + pi-, where Lambda c+-->pK* pi+. We interpret these states as the Sigma b(*)+/- baryons and measure the following masses: m Sigma b+=5807.8 -2.2 +2.0(stat.)+/-1.7(syst.) MeV/c2, m Sigma b- =5815.2+/-1.0(stat.)+/-1.7(syst.) MeV/c2, and m(Sigma b*)-m(Sigma b)=21.2-1.9 +2.0(stat.)-0.3+0.4(syst.) MeV/c2.

Authors: Aaltonen, T; Abulencia, A; Adelman, J; Affolder, T; Akimoto, T

• Publication status: Published
• Journal: Physical Review Letters
• Volume: 99
• Issue: 20
• Pages: 202001
• Publication date: 2007-11-01
• DOI: 10.1103/physrevlett.99.202001
• EISSN: 1079-7114
• ISSN: 0031-9007
• Language: English
• Keywords: CDF Collaboration