E-viri
PDF
Recenzirano
-
Aaltonen, T.; Maki, T.; Mehtala, P.; Orava, R.; Osterberg, K.; Saarikko, H.; Remortel, N. van; 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.
Physical review letters, 11/2007, Letnik: 99, Številka: 20Journal Article
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}.
