AKK Update: Improvements from New Theoretical Input and Experimental Data

S. Albino; B. A. Kniehl; G. Kramer

doi:10.1016/j.nuclphysb.2008.05.017

paper

AKK Update: Improvements from New Theoretical Input and Experimental Data

arXiv:0803.2768 · doi:10.1016/j.nuclphysb.2008.05.017

Abstract

We perform a number of improvements to the previous AKK extraction of fragmentation functions for $π^{\pm}$ , $K^{\pm}$ , $p / p ˉ$ , $K_{S}^{0}$ and $Λ/ Λ ˉ$ particles at next-to-leading order. Inclusive hadron production measurements from $pp (p ˉ)$ 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.

AKK Update: Improvements from New Theoretical Input and Experimental Data

Abstract

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