Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Can STAR $p+p$ data help constrain fragmentation functions for strange
  hadrons   STAR has measured a variety of strange particle species in $p+p$ collisions
at $\sqrt{s}$=200 GeV. These high statistics data are ideal for comparing to
existing leading- and next-to-leading order perturbative QCD (pQCD) models.
Leading-order (LO) models such as PYTHIA need to be tuned to describe
identified strange particle data from STAR. We show that tuned PYTHIA can also
describe the pt-spectra of strange resonances. More rigorous Next-to-Leading
order pQCD calculations using parameterized fragmentation functions for quarks
and gluons will also be compared to STAR data. The OPAL experiment has recently
released $e^{+}e^{-}$ data from light quark flavor tagged analyses allowing for
the first time to make precise parameterizations of light flavor separated
fragmentation function. We show that our Lambda data put a more stringent
constraint on the gluon fragmentation function than $e^{+}e^{-}$ data.
Furthermore we show that pQCD fails to describe the observed enhancement of
baryon-to-meson ratio at intermediate pt (2-6 GeV/c), which may be a first
indication of other, non-perturbative mechanisms at play in $p+p$ collisions at
that momentum.

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The categories of this paper are: nucl-ex
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The categories of this paper are: supr-con
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The categories of this paper are: hep-th
4
The categories of this paper are: cond-mat
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The categories of this paper are: alg-geom
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The categories of this paper are: comp-gas
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The categories of this paper are: stat
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The categories of this paper are: dg-ga
35
The categories of this paper are: mtrl-th
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The categories of this paper are: hep-lat
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The categories of this paper are: ao-sci
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The categories of this paper are: physics
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The categories of this paper are: gr-qc
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The categories of this paper are: nlin
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The categories of this paper are: chao-dyn
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The categories of this paper are: eess