Abstract
We present preliminary COMPASS results on pion and kaon multiplicities produced in semi inclusive deep inelastic scattering of 160[Formula: see text]GeV muons off an isoscalar ([Formula: see text]LiD) target. The results constitute an impressive data set of more than 400 points in p and 400 in K, covering a large x,Q[Formula: see text] and z domain in a fine binning, which will be used in future QCD fits at next to leading order to extract quark fragmentation functions. We show results of a first leading order fit performed to extract the favored and unfavored quark fragmentation functions into pions D[Formula: see text] and D[Formula: see text].
Highlights
Parton fragmentation functions (FFs), like parton distribution functions (PDFs), are non perturbative objects
To access the strange quark polarization ∆s from polarized SIDIS, the strange quark FF into kaon DKs is needed and it constitutes by far the largest contribution to the uncertainty in the extraction
Data sensitive to FFs exist from e+e− and p pbar reactions, but they are unsufficient for a good flavor separation; they lie at relatively too high Q2 values
Summary
We present preliminary COMPASS results on pion and kaon multiplicities produced in semi inclusive deep inelastic scattering of 160 GeV muons off an isoscalar (6LiD) target. The results constitute an impressive data set of more than 400 points in p and 400 in K, covering a large x,Q2 and z domain in a fine binning, which will be used in future QCD fits at next to leading order to extract quark fragmentation functions. We show results of a first leading order fit performed to extract the favored and unfavored quark fragmentation functions into pions Dπfav and Dπunfav.
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