Phys. Rev. Lett. 89, 272301 (2002) [4 pages]Decisive Role of Fragmentation Functions in Hard Hadron ProductionReceived 2 May 2002; published 16 December 2002 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. © 2002 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.89.272301
DOI:
10.1103/PhysRevLett.89.272301
PACS:
25.75.–q, 13.85.–t, 13.87.Fh
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