Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Constant contribution in meson correlators at finite temperature   We discuss a constant contribution to meson correlators at finite
temperature. In the deconfinement phase of QCD, a colored single quark state is
allowed as a finite energy state, which yields to a contribution of wraparound
quark propagation to temporal meson correlators. We investigate the effects in
the free quark case and quenched QCD at finite temperature. The ``scattering''
contribution causes a constant mode in meson correlators with zero spatial
momentum and degenerate quark masses, which can dominate the correlators in the
region of large imaginary times. In the free spectral function, the
contribution yields a term proportional to $\omega\delta(\omega)$. Therefore
this contribution is related to transport phenomena in the quark gluon plasma.
It is possible to distinguish the constant contribution from the other part
using several analysis methods proposed in this paper. As a result of the
analyses, we find that drastic changes in charmonium correlators for $\chi_c$
states just above the deconfinement transition are due to the constant
contribution. The other differences in the $\chi_c$ states are small. It may
indicate the survival of $\chi_c$ states after the deconfinement transition
until, at least, $1.4T_c$.

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The categories of this paper are: econ
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The categories of this paper are: dg-ga
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The categories of this paper are: math-ph
3
The categories of this paper are: physics
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The categories of this paper are: adap-org
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The categories of this paper are: mtrl-th
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The categories of this paper are: cmp-lg
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The categories of this paper are: supr-con
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The categories of this paper are: plasm-ph
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The categories of this paper are: chem-ph
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The categories of this paper are: quant-ph
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The categories of this paper are: cs
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The categories of this paper are: funct-an
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The categories of this paper are: hep-ex
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The categories of this paper are: nucl-th
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The categories of this paper are: q-fin