Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Renormalization of 4-Quark Operators and QCD-Sum Rules   We compute the renormalization mismatch displayed in 1--loop approximation by
classically equivalent 4-quark operators and coming from different possible
definitions of the $\gamma_5$ matrix in dimensional regularization. The result
is then employed to study the effect of the various treatments of $\gamma_5$
upon the size of radiative corrections to 4-quark condensates in the QCD sum
rules for $\rho$ and $A_1$ mesons. We find that a fully anticommuting
$\gamma_5$ which automatically respects non-anomalous chiral Ward-Slavnov
identities leads to considerably smaller corrections and reduces theoretical
uncertainty in the QCD prediction for the $\tau$ hadronic decay rate.

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The categories of this paper are: gr-qc
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The categories of this paper are: patt-sol
11
The categories of this paper are: hep-lat
30
The categories of this paper are: q-alg
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The categories of this paper are: chao-dyn
29
The categories of this paper are: funct-an
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The categories of this paper are: nlin
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The categories of this paper are: astro-ph
14
The categories of this paper are: math-ph
31
The categories of this paper are: ao-sci
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The categories of this paper are: stat
36
The categories of this paper are: cmp-lg
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The categories of this paper are: q-fin
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The categories of this paper are: chem-ph
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The categories of this paper are: cs
12
The categories of this paper are: nucl-th