The long-standing problem of explaining the observed polarization of Lambda hyperons, inclusively produced in the high-energy collisions of unpolarized hadrons, is tackled by considering spin- and k(perp)-dependent quark-fragmentation functions. The data on Lambda 's and Lambdabar's produced in p-N processes are used to determine simple phenomenological expressions for these new "polarizing fragmentation functions," which describe the experiments remarkably well.
Lambda polarization from unpolarized quark fragmentation
D'ALESIO, UMBERTO;
2001-01-01
Abstract
The long-standing problem of explaining the observed polarization of Lambda hyperons, inclusively produced in the high-energy collisions of unpolarized hadrons, is tackled by considering spin- and k(perp)-dependent quark-fragmentation functions. The data on Lambda 's and Lambdabar's produced in p-N processes are used to determine simple phenomenological expressions for these new "polarizing fragmentation functions," which describe the experiments remarkably well.
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