Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Robustness and Predictivity of 4 TeV Unification   The stability of the predictions of two of the standard model parameters,
$\alpha_3(M_Z)$ and $\sin^2 \theta(M_Z)$, in a $M_U \sim 4$ TeV unification
model is examined. It is concluded that varying the unification scale between
$M_U \simeq 2.5$ TeV and $M_U \simeq 5$ TeV leaves robust all predictions
within reasonable bounds. Choosing $M_U = 3.8 \pm 0.4$ TeV gives, at lowest
order, accurate predictions at $M_Z$. The impact of threshold effects on
unification depends on the spectrum of states beyond the standard model.

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The categories of this paper are: nlin
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The categories of this paper are: plasm-ph
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The categories of this paper are: physics
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The categories of this paper are: patt-sol
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The categories of this paper are: econ
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The categories of this paper are: quant-ph
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The categories of this paper are: q-fin
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The categories of this paper are: alg-geom
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The categories of this paper are: bayes-an
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The categories of this paper are: hep-th
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The categories of this paper are: nucl-th
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The categories of this paper are: hep-ex
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The categories of this paper are: hep-lat
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The categories of this paper are: q-alg
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The categories of this paper are: adap-org
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The categories of this paper are: cond-mat