Structure and Production of Lambda Baryons

Details Structure and Production of Lambda Baryons Structure and Production of Lambda Baryons

1999-08-05

arxiv.org/abs/hep-ph/9908260v2

Phys.Rev.D61:014007,2000

Physics

High Energy Physics

High Energy Physics - Phenomenology

24 pages, 9 figures, minor changes

Scientific paper

10.1103/PhysRevD.61.014007

We discuss the quark parton structure of the $\Lambda$ baryon and the fragmentation of quarks into $\Lambda$ baryons. We show that the hyperfine interaction, responsible for the $\Delta$-$N$ and $\Sigma^0$-$\Lambda$ mass splittings, leads not only to sizeable SU(3) and SU(6) symmetry breaking in the quark distributions of the $\Lambda$, but also to significant polarized non-strange quark distributions. The same arguments suggest flavor asymmetric quark fragmentation functions and non-zero polarized non-strange quark fragmentation functions. The calculated fragmentation functions give a good description of all measured observables. We predict significant positive $\Lambda$ polarization in semi-inclusive DIS experiments while models based on SU(3) flavor symmetry predict zero or negative $\Lambda$ polarization. Our approach also provides a natural explanation for the dependence of the maximum of the $\xi=\ln(1/z)$ spectrum on the mass of the particles produced in $e^+e^-$ annihilation.

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