Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Universal anti-baryon density in $e^+e^-$,$\gamma p$, pp, pA and AA
  collisions   We compiled the systematical measurements of anti-nucleus production in
ultra-relativistic heavy ion collisions as well as those in $pp$, $p\bar{p}$,
$\gamma p$ and $e^{+}e^{-}$ at various beam energies. The anti-baryon phase
space density inferred from $\bar{d}/\bar{p}$ ratio in $A+A$, $p+A$,
$pp(\bar{p})$ and $\gamma p$ collisions is found to follow a universal
distribution as a function of center of mass of beam energy and can be
described in a statistical model. We demonstrated that anti-baryon density in
all the collisions is the highest when the collisions are dominated by the
processes of $g+g$ or $\bar{q}+g$. In $e^+e^-$ collisions at LEP, the cross
section of $q\bar{q}g$ is suppressed by a factor of strong coupling constant
$\alpha_s$ relative to $q\bar{q}$. This can consistently explain the $\bar{d}$
suppression observed by ALEPH relative to that in $e^+e^-\to ggg$ by ARGUS. We
discuss the implications to the baryon enhancement at high transverse momentum
at RHIC when jet is quenched.

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The categories of this paper are: math-ph
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The categories of this paper are: quant-ph
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The categories of this paper are: econ
28
The categories of this paper are: alg-geom
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The categories of this paper are: bayes-an
5
The categories of this paper are: gr-qc
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The categories of this paper are: adap-org
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The categories of this paper are: nucl-th
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The categories of this paper are: funct-an
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The categories of this paper are: hep-ph
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The categories of this paper are: astro-ph
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The categories of this paper are: eess
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The categories of this paper are: mtrl-th
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The categories of this paper are: chao-dyn
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The categories of this paper are: plasm-ph
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The categories of this paper are: acc-phys