Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2001-08-06
Eur.Phys.J.C22:269-276,2001
Physics
High Energy Physics
High Energy Physics - Phenomenology
19 pages, 7 figures, minor changes for publication in EPJC
Scientific paper
10.1007/s100520100815
By combining recent HERMES data on semi-inclusive DIS $\pi^\pm$-production with the singlet fragmentation function $D_\Sigma^{\pi^+}$, which is well determined from $e^+e^-$ data, we are able to extract, for the first time, the flavoured fragmentation functions $D_u^{\pi^+}$, $D_d^{\pi^+}$ and $D_s^{\pi^+}$ without making any assumptions about favoured and unfavoured transitions. Whereas $D_u^{\pi^+}$ and $D_d^{\pi^+}$ are very well determined, the accuracy of $D_s^{\pi^+}$ is limited by the uncertainty in evolving $D_\Sigma^{\pi^+}$ from the $Z^0$ pole down to the SIDIS scale of a few $(GeV)^2$. We discuss how the precision on $D_s^{\pi^+}$ could be improved. Knowledge of the $D_{q=u,d,s}^{\pi^+}$ will permit the extraction of the polarized parton densities from future polarized SIDIS asymmetry measurements. We study the precision that can be expected in such an extraction.
Christova Ekaterina
Kretzer Stefan
Leader Elliot
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