Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: BPS index and 4d N=2 superconformal field theories   We study the BPS index for the four-dimensional rank-one N=2 superconformal
field theories H_0, H_1, H_2, E_6, E_7, E_8. We consider compactifications of
the E-string theory on T^2 in which these theories arise as low energy limits.
Using this realization we clarify the general structure of the BPS index. The
index is characterized by two exponents and a sequence of invariants. We
determine the exponents and the first few invariants.

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The categories of this paper are: ao-sci
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The categories of this paper are: nucl-th
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The categories of this paper are: q-bio
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The categories of this paper are: adap-org
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The categories of this paper are: astro-ph
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The categories of this paper are: bayes-an
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The categories of this paper are: hep-ph
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The categories of this paper are: acc-phys
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The categories of this paper are: cmp-lg
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The categories of this paper are: supr-con
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The categories of this paper are: dg-ga
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The categories of this paper are: q-alg
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The categories of this paper are: comp-gas
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The categories of this paper are: eess
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The categories of this paper are: mtrl-th
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The categories of this paper are: math