Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The QGP-Stall or Not ?   In 1996, D.H. Rischke and M. Gyulassy proposed to use the time-delay signal
in Bose-Einstein correlations (BEC) as a signature for the possible formation
of a quark-gluon plasma (QGP) in relativistic heavy-ion collisions. In
particular, they suggested to measure the ratio of the transversal
interferometry radii, $R_{out}/R_{side}$, which can be obtained by fitting
experimental BEC data with a parametrization introduced by G. Bertsch et al. in
1988. The transverse radius parameter $R_{out}$ has compared to the transverse
radius parameter $R_{side}$ an additional temporal dependence which should be
sensitive to a prolonged lifetime of a fireball, in case a QGP was formed in a
relativistic heavy-ion collision. This latter phenomenon is known under the
term ``QGP stall''. In the following, I shall explain why I believe that the
time-delay signal in Bose-Einstein correlations is not a good signature for the
possible formation of a QGP.

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The categories of this paper are: q-fin
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The categories of this paper are: funct-an
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The categories of this paper are: gr-qc
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The categories of this paper are: cond-mat
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The categories of this paper are: physics
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The categories of this paper are: q-alg
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The categories of this paper are: econ
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The categories of this paper are: atom-ph
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The categories of this paper are: plasm-ph
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The categories of this paper are: cs
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The categories of this paper are: stat
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The categories of this paper are: hep-ph
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The categories of this paper are: alg-geom
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The categories of this paper are: supr-con
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The categories of this paper are: chao-dyn
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The categories of this paper are: hep-lat