AKK update: Improvements from new theoretical input and experimental data

作者：Albino S^*; Kniehl B A; Kramer G

来源：Nuclear Physics B, 2008, 803(1-2): 42-104.

DOI：10.1016/j.nuclphysb.2008.05.017

We perform a number of improvements to the previous AKK extraction of fragmentation functions for pi(+/-), K-+/-, p/p, K-S(0) and Lambda/Lambda particles at next-to-leading order. Inclusive hadron production measurements from pp(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 root 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 chi(2). To further exploit the data, all published normalization errors are incorporated via a correlation matrix.

• 出版日期2008-11-1