Abstract
The polarizations of Λ and ${\bar{\varLambda}}$ are thought to retain memories of the spins of their parent s quarks and ${\bar{s}}$ antiquarks, and are readily measurable via the angular distributions of their daughter protons and antiprotons. Correlations between the spins of Λ and ${\bar{\varLambda}}$ produced at low relative momenta may therefore be used to probe the spin states of $s {\bar{s}}$ pairs produced during hadronization. We consider the possibilities that they are produced in a 3P0 state, as might result from fluctuations in the magnitude of $\langle {\bar{s}} s \rangle$ , a 1S0 state, as might result from chiral fluctuations, or a 3S1 or other spin state, as might result from production by a quark–antiquark or gluon pair. We provide templates for the $p {\bar{p}}$ angular correlations that would be expected in each of these cases, and discuss how they might be used to distinguish $s {\bar{s}}$ production mechanisms in pp and heavy-ion collisions.
Highlights
Hadronization proceeds via the production of qq pairs, that may arise via a combinations of perturbative and non-perturbative mechanisms, such as gluon splitting g → qq and fluctuations in the chiral condensate qq
In order to select ΛΛ pairs that are most likely to be due to pair-production of a single ss pair, we propose to examine ΛΛ pairs with small relative 3-momenta p
We have shown that ΛΛ pairs produced via perturbative vector couplings to ss could have very different spin correlations from those produced via non-perturbative scalar or pseudoscalar couplings to ss
Summary
Hadronization proceeds via the production of qq pairs, that may arise via a combinations of perturbative and non-perturbative mechanisms, such as gluon splitting g → qq and fluctuations in the chiral condensate qq. It is quite possible that the relative importances of these mechanisms may depend on the types of particles colliding, e.g., pp or heavy-ion collisions, and on the kinematic conditions, e.g., low momenta in minimum-bias events or at high pT inside jets These mechanisms suggest various different possibilities for the qq quantum numbers, and in particular their possible spin states. In the case of perturbative g → ss splitting, the final state pair would be in a vector state, that could correspond to a 3S1 or 3D1 configuration The former would dominate if the strange quark mass could be neglected, but the latter is potentially important for massive quarks, as evidenced by the appearance of a 3D1 cc vector meson in e+e− annihilation. The type of analysis proposed here might provide interesting insights into the similarities and/or differences between hadronization mechanisms in pp and heavy-ion collisions
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