Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Prospect for Heavy Quarks Lighter than $M_W$   As the excitement surrounding the heavy top quark discovery subsides, while
the expectation for LEP II physics gathers, it is a good time to sit back and
reflect on whether energy regions available to us have been fully explored. We
emphasize that a loophole exists where heavy quarks, perhaps the actual top
quark itself, could still be hidden below $M_W$. This would typically involve
scalar induced decays of the heavy quark, and could be realized in models with
more than one Higgs doublet, e.g. MSSM. We illustrate such mechanisms with two
Higgs doublet models, the addition of singlet quarks, as well as reconsidering
a fourth family of quarks and leptons. Curiously, the present $R_b$--$R_c$
problem may be a harbinger of such scenarios. Given that LEP-II would be
running soon, and in view of the large amount of data that the Tevatron has
collected, we urge our experimental colleagues to conduct a critical analysis.

19
The categories of this paper are: eess
36
The categories of this paper are: cmp-lg
8
The categories of this paper are: hep-ex
2
The categories of this paper are: math
3
The categories of this paper are: physics
33
The categories of this paper are: plasm-ph
14
The categories of this paper are: math-ph
32
The categories of this paper are: atom-ph
7
The categories of this paper are: hep-th
15
The categories of this paper are: nucl-ex
1
The categories of this paper are: cs
35
The categories of this paper are: mtrl-th
13
The categories of this paper are: quant-ph
17
The categories of this paper are: q-fin
25
The categories of this paper are: patt-sol
5
The categories of this paper are: gr-qc