Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1993-10-06
JETP Lett. 60 (1994) 496-504
Physics
High Energy Physics
High Energy Physics - Phenomenology
10 pages (no figures), Plain TEX , report DFTT 48/93
Scientific paper
We calculate the spin density matrix of the hadron $h$ created via quark fragmentation in the process $e^-e^+ \to q\bar q \to h + X$. In the case of $h=\Lambda$ the experimental data could possibly elucidate the problem of $s$-quark contribution to the spin of the $\Lambda$-hyperon, to be compared with the case of the proton (``spin crisis''). Generally we find that for hadrons with spin 1/2 the parton description, using only probabilities, works much better than for vector particles, since in the former case the non diagonal matrix elements of the hadron spin density matrix are suppressed by a small factor $p_T/(z\sqrt s)$, where $p_T$ is the hadron transverse momentum inside the jet.
Anselm Alexei
Anselmino Mauro
Murgia Francesco
Ryskin M. G.
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