[Brahms-l] Fwd: STAR paper on the observation of anti-matter hyper-nucleus at RHIC

FYI

>
> Dear Barbara, Wit, Flemming and Steve,
>
> I am pleased to announce that the STAR collaboration will submit to  
> Science Magazine, in a week's time, a paper on the observation of  
> anti-matter hyper-nucleus. The title and abstract are included below.
>
> Best regards,
>
> Nu Xu
>
> -----------------------------------------------------------------------
> Nu Xu
>
> Build. 510A, I-181	    Phone:  (631)344-3471
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> -----------------------------------------------------------------------
> =============================================================
> Title: "Observation of an antimatter hypernucleus"
>
> Abstract: "We report the first observation of an antimatter  
> hypernucleus, the
> antihypertriton, ^3_\bar{\Lambda}H, an exotic nucleus consisting of an
> antiproton (\bar{p}), an antineutron (\bar{n}), and an antilambda  
> hyperon
> (\bar{\Lambda}). The experiment examined interactions produced by
> colliding beams of gold nuclei at a center-of-mass energy of 200 GeV  
> per
> nucleon pair. Our analysis yields 70 +- 17 antihypertritons and 157  
> +- 30
> hypertritons (^3_{\Lambda}H). The lifetime of the combined sample,
> sensitive to the hyperon-nucleon force, is measured to be $ \tau =  
> 182 +-
> ^{89}_{45} (statistical) +- 27 (systematic)$ ps. The measured yields  
> of
> hypertriton (antihypertriton) and helium3 (antihelium3) are similar,
> suggesting an equilibrium in coordinate and momentum space  
> populations of
> up, down, and strange quarks and antiquarks in these collisions, in
> contrast to the pattern observed in nuclear collisions at lower  
> energies.
> Our ability to produce and measure these antihypernuclei opens up the
> study of a new octant in the 3-dimensional chart of the nuclides. The
> implications of the present observations for understanding  
> antimatter and
> hypermatter are described."
>

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