Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Scale Optimisation and Event Shapes in Deep-Inelastic Scattering   We study the effect of optimising the renormalisation and factorisation
scales on perturbative calculations of event shape means defined in the Breit
frame of ep DIS. Unlike in the case of e^+e^- event shape means, this has only
a small effect on the NLO QCD predictions and a large power correction is still
required to fit the data. However, if separate renormalization scales are
introduced for the quark- and gluon-initiated sub-processes the optimisation
has a much larger effect and greatly reduces the size of the required power
corrections. Unfortunately, there are then problems fitting the low energy data
for some observables.

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The categories of this paper are: hep-lat
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The categories of this paper are: physics
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The categories of this paper are: solv-int
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The categories of this paper are: chem-ph
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The categories of this paper are: funct-an
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The categories of this paper are: nucl-ex
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The categories of this paper are: adap-org
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The categories of this paper are: chao-dyn
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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: comp-gas
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The categories of this paper are: quant-ph
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The categories of this paper are: alg-geom
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The categories of this paper are: gr-qc
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The categories of this paper are: q-bio
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The categories of this paper are: q-fin