Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2006-06-23
Phys.Rev.D74:034012,2006
Physics
High Energy Physics
High Energy Physics - Phenomenology
19 pages, 20 figures
Scientific paper
10.1103/PhysRevD.74.034012
We analyze the energy scale dependence of fragmentation functions from $e^+$-$e^-$ collisions using conventional momentum measures $x_p$ and $\xi_p$ and rapidity $y$. We find that replotting fragmentation functions on a normalized rapidity variable results in a compact form precisely represented by the beta distribution, its two parameters varying slowly and simply with parton energy scale $Q$. The resulting parameterization enables extrapolation of fragmentation functions to low $Q$ in order to describe fragment distributions at low transverse momentum $p_t$ in heavy ion collisions at RHIC.
Kettler David T.
Trainor Thomas A.
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