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| VOLUME 60 (1994) | ISSUE 7 |
PAGE 486
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Parton interpretation of quark fragmentation into hadrons with different spins
Anselm A., Ryskin M. G., Anselmino M., Murgia F.
The spin density matrix of the hadron h, which is created via quark fragmentation in the process e~e+—yqq—>h+X, has been calculated. In the case of h = A the experimental data could possibly elucidate the problem of s-quark contribution to the spin of the Λ hyperon, which can be compared with the case of the proton (the "spin crisis")For hadrons with spin 1/2 the parton description, which uses only probabilities, generally works much better than for vector particles, since in the former case the nondiagonal matrix elements of the hadron spin density matrix are suppressed by a small factor pTl{z4s), where pT is the hadron transverse momentum inside the jet. © 1994 American Institute of
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![](/ps/1349/article_20379_800_head.png "The spin density matrix of the hadron <i>h, </i>which is created via quark fragmentation in the process <i>e~e<sup>+</sup>—yqq—>h+X, </i>has been calculated. In the case of <i>h = A </i>the experimental data could possibly elucidate the problem of s-quark contribution to the spin of the Λ hyperon, which can be compared with the case of the proton (the "spin crisis")For hadrons with spin 1/2 the parton description, which uses only probabilities, generally works much better than for vector particles, since in the former case the nondiagonal matrix elements of the hadron spin density matrix are suppressed by a small factor <i>p<sub>T</sub>l</i><i>{z4s), </i>where <i>p<sub>T</sub> </i>is the hadron transverse momentum inside the jet. © <i>1994 American Institute of</i>")