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Decisive role of fragmentation functions in hard hadron production
Xiaofei Zhang1, George Fai, Péter Lévai
1Center for Nuclear Research, Department of Physics, Kent State University, Kent, OH 44242, USA.
Physical Review Letters
|January 7, 2003
Abstract:
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.