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Type: Journal article
Title: Structure and production of lambda baryons
Author: Boros, C.
Londergan, J.
Thomas, A.
Citation: Physical Review D: Particles, Fields, Gravitation and Cosmology, 1999; 61(1):014007-
Publisher: American Physical Society
Issue Date: 1999
ISSN: 0556-2821
Statement of
C. Boros, J. T. Londergan, A. W. Thomas
Abstract: We discuss the quark parton structure of the Λ baryon and the fragmentation of quarks into Λ baryons. We show that the hyperfine interaction, responsible for the Δ-N and Σ0-Λ mass splittings, leads not only to sizable SU(3) and SU(6) symmetry breaking in the quark distributions of the Λ, 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 Λ polarization in semi-inclusive DIS experiments while models based on SU(3) flavor symmetry predict zero or negative Λ polarization. Our approach also provides a natural explanation for the dependence of the maximum of the ξ=ln(1/z) spectrum on the mass of the particles produced in e+e- annihilation.
Rights: ©1999 American Physical Society
DOI: 10.1103/PhysRevD.61.014007
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Special Research Centre for the Subatomic Structure of Matter publications

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