Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Light Threshold Effects in Supersymmetric Grand Unified Theories   Supersymmetric Grand Unified Theories have a rich spectrum of particles
barely heavier than the intermediate vector bosons. As their non-supersymmetric
counterparts, they lead to many relations among low energy observables. But the
precise form of the predictions is modified by the extended spectrum. If the
masses of these new particles are comparable to $M_Z$, the standard computation
of their effect becomes inaccurate. We present a detail discussion of the
correct procedure, and carry out the relevant computations to one loop order.
The procedure we propose has the advantage over other existing methods that
two-loop running of gauge couplings can be incorporated readily and
consistently. Attention is paid to the special treatment that the top and Higgs
particles must receive. The size of the effect is explored for a range of
parameters in the minimal supersymmetric $SU(5)$ grand-unified theory with
radiative breaking. It is found that the naive (leading-log) computation can be
fairly inaccurate.

24
The categories of this paper are: dg-ga
30
The categories of this paper are: q-alg
6
The categories of this paper are: astro-ph
17
The categories of this paper are: q-fin
14
The categories of this paper are: math-ph
4
The categories of this paper are: cond-mat
1
The categories of this paper are: cs
26
The categories of this paper are: bayes-an
20
The categories of this paper are: acc-phys
28
The categories of this paper are: alg-geom
32
The categories of this paper are: atom-ph
23
The categories of this paper are: solv-int
25
The categories of this paper are: patt-sol
13
The categories of this paper are: quant-ph
31
The categories of this paper are: ao-sci
18
The categories of this paper are: econ