Observation of the Heavy Baryons $Σ_{b}$ and $Σ_{b}^{*}$

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12 November 2007

journal article
research article
Published by American Physical Society (APS) in Physical Review Letters

Vol. 99 (20) , 202001
https://doi.org/10.1103/physrevlett.99.202001

Abstract

We report an observation of new bottom baryons produced in

p \bar{p}

collisions at the Tevatron. Using

1.1 {fb}^{- 1}

of data collected by the CDF II detector, we observe four

Λ_{b}^{0} π^{\pm}

resonances in the fully reconstructed decay mode

Λ_{b}^{0} \to Λ_{c}^{+} π^{-}

, where

Λ_{c}^{+} \to p K^{-} π^{+}

. We interpret these states as the

Σ_{b}^{(*) \pm}

baryons and measure the following masses:

m_{Σ_{b}^{+}} = {5807.8}_{- 2.2}^{+ 2.0} (stat .) \pm 1.7 (syst .) MeV / c^{2}

,

m_{Σ_{b}^{-}} = 5815.2 \pm 1.0 (stat .) \pm 1.7 (syst .) MeV / c^{2}

, and

m (Σ_{b}^{*}) - m (Σ_{b}) = {21.2}_{- 1.9}^{+ 2.0} (stat .)_{- 0.3}^{+ 0.4} (syst .) MeV / c^{2}

.

Keywords

CDF

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This publication has 29 references indexed in Scilit:

Update of heavy baryon mass predictions
Physical Review D, 1997
Heavy baryon masses in the $\frac{1}{m_{Q}}$ and $\frac{1}{N_{c}}$ expansions
Physical Review D, 1996
Masses ofc $$\bar s$$ b $$\bar s$$ , andc $$\bar b$$ states in potential models
The European Physical Journal C, 1990
Mass splitting of heavy baryon isospin multiplets
Physical Review D, 1987
Beautiful and other heavy baryons revisited
Physics Letters B, 1987
Baryon masses in relativistic potential models
The European Physical Journal C, 1986
Baryons with charm and strangeness in potential models
Physics Letters B, 1983
Spectroscopy of hadrons containing one heavy quark
Nuclear Physics B, 1982
Do Quarks Interact Pairwise and Satisfy the Color Hypothesis?
Physical Review Letters, 1980
Nonperturbative potential model for light and heavy quark-antiquark systems
Physical Review D, 1980