AKK update: Improvements from new theoretical input and experimental data Original Research Article

We perform a number of improvements to the previous AKK extraction of fragmentation functions for image, image, image, image and image particles at next-to-leading order. Inclusive hadron production measurements from image 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 image reactions in regions of smaller x and lower image are added. Hadron mass effects are treated for all observables and, for each particle, the hadron mass used for the description of the image reaction is fitted. The baryonsʹ fitted masses are found to be only around 1% above their true masses, while the values of the mesonsʹ fitted masses have the correct order of magnitude. Large x resummation is applied in the coefficient functions of the image reactions, and also in the evolution of the fragmentation functions, which in most cases results in a significant reduction of the minimized image. To further exploit the data, all published normalization errors are incorporated via a correlation matrix.