Spin effects in the fragmentation of transversely polarized and unpolarized quarks

Details Spin effects in the fragmentation of transversely polarized and unpolarized quarks Spin effects in the fragmentation of transversely polarized and unpolarized quarks

2000-11-29

arxiv.org/abs/hep-ph/0011361v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

5 pages + 2 eps figures, uses aipproc.sty and epsfig.sty. Talk delivered by M. Anselmino at the "14th International Spin Physi

Scientific paper

10.1063/1.1384123

We study the fragmentation of a transversely polarized quark into a non collinear (k_T not= 0) spinless hadron and the fragmentation of an unpolarized quark into a non collinear transversely polarized spin 1/2 baryon. These nonperturbative properties are described by spin and k_T dependent fragmentation functions and are revealed in the observation of single spin asymmetries. Recent data on the production of pions in polarized semi-inclusive DIS and long known data on Lambda polarization in unpolarized p-N processes are considered: these new fragmentation functions can describe the experimental results and the single spin effects in the quark fragmentation turn out to be surprisingly large.

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