AKK update: Improvements from new theoretical input and experimental data

By S. Albino, Bernd A. Kniehl, G. Kramer. 2008

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Abstract We perform a number of improvements to the previous AKK extraction of fragmentation functions for π ± , K ± , p / p ¯ , K S 0 and Λ / Λ ¯ particles at next-to-leading order. Inclusive hadron production measurements from p p ( p ¯ ) reactions at BRAHMS, CDF, PHENIX and STAR are added to the data sample. We use the charge-sign asymmetry of the produced hadrons in pp reactions to constrain the valence quark fragmentations. Data from e + e − reactions in regions of smaller x and lower s are added. Hadron mass effects are treated for all observables and, for each particle, the hadron mass used for the description of the e + e − reaction is fitted. The baryons' fitted masses are found to be only around 1% above their true masses, while the values of the mesons' fitted masses have the correct order of magnitude. Large x resummation is applied in the coefficient functions of the e + e − reactions, and also in the evolution of the fragmentation functions, which in most cases results in a significant reduction of the minimized χ 2 . To further exploit the data, all published normalization errors are incorporated via a correlation matrix.

Subfields: Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/6c0434373f94ba3800764d6dc3444fea562f3650

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In Nuclear and High Energy Physics

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