Orateur
Dr
Valery Lyuboshitz
(Joint Institute for Nuclear Research ( Dubna, Russia ))
Description
Spin correlations for the $\Lambda \Lambda$ and
$\Lambda \bar{\Lambda}$ pairs, generated in relativistic
heavy ion collisions, and related angular correlations at the
joint registration of hadronic decays of two hyperons, in which
space parity is not conserved, are analyzed. The correlation
tensor components can be derived from the double angular
distribution of products of two decays by the method of
"moments" . The properties of the "trace" of the correlation
tensor ( a sum of three diagonal components ), determining the
relative fractions of the triplet states and singlet state of
respective pairs, are discussed. Spin correlations for two
identical particles ($\Lambda \Lambda$) and two non-identical
particles ($\Lambda \bar{\Lambda}$) are considered from the
viewpoint of the conventional model of one-particle sources.
In the framework of this model, correlations vanish at
sufficiently large relative momenta. However, under these
conditions, in the case of two non-identical particles
($\Lambda \bar{\Lambda}$) a noticeable role is played by
two-particle annihilation ( two-quark, two-gluon ) sources,
which lead to the difference of the correlation tensor from
zero. In particular, such a situation may arise when the
system passes through the "mixed phase" .
Auteur principal
Dr
Valery Lyuboshitz
(Joint Institute for Nuclear Research ( Dubna, Russia ))
Co-auteur
Dr
Vladimir Lyuboshitz
(Joint Institute for Nuclear Research ( Dubna, Russia ))
