Decisive role of fragmentation functions in hard hadron production.
It is demonstrated that the fragmentation functions at large momentum fraction play a key role in hard hadron production from relativistic proton-proton collisions. We find that this region of the fragmentation functions is not strongly constrained by the electron-positron data. This freedom can be used (together with the transverse-momentum distribution of partons) to reproduce hard pion-to-proton ratio data in relativistic proton-proton collisions.
Zhang
Xiaofei
X
Center for Nuclear Research, Department of Physics, Kent State University, Kent, OH 44242, USA.
Fai
George
G
Lévai
Péter
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