Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Lowering alpha_s by flipping SU(5)   We show that the prediction for $\alpha_s(M_Z)$ in flipped SU(5) is naturally
lower than in minimal SU(5), and that the former can accommodate the full range
of $\alpha_s(M_Z)$ presently allowed by experiment. Our computations include
two-loop ($\delta_{\rm 2loop}$) and light ($\delta_{\rm light}$) and heavy
($\delta_{\rm heavy}$) threshold effects. Unlike minimal SU(5), in flipped
SU(5) the heavy threshold effects can naturally decrease the predicted value of
$\alpha_s(M_Z)$. We also show that the value of the proton lifetime into the
dominant channel $p\to e^+\pi^0$ is within the observable range at
SuperKamiokande, and should discriminate against minimal supersymmetric SU(5),
where the dominant mode is $p\to\bar\nu K^+$.

30
The categories of this paper are: q-alg
36
The categories of this paper are: cmp-lg
22
The categories of this paper are: chao-dyn
21
The categories of this paper are: adap-org
31
The categories of this paper are: ao-sci
5
The categories of this paper are: gr-qc
27
The categories of this paper are: comp-gas
32
The categories of this paper are: atom-ph
17
The categories of this paper are: q-fin
13
The categories of this paper are: quant-ph
3
The categories of this paper are: physics
35
The categories of this paper are: mtrl-th
10
The categories of this paper are: q-bio
6
The categories of this paper are: astro-ph
23
The categories of this paper are: solv-int
18
The categories of this paper are: econ