Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Proton tensor charges from a Poincar\'e-covariant Faddeev equation   The proton's tensor charges are calculated at leading order in a
symmetry-preserving truncation of all matter-sector equations relevant to the
associated bound-state and scattering problems. In particular, the nucleon
three-body bound-state equation is solved without using a diquark approximation
of the two-body scattering kernel. The computed charges are similar to those
obtained in contemporary simulations of lattice-regularised quantum
chromodynamics, an outcome which increases the tension between theory and
phenomenology. Curiously, the theoretical calculations produce a value of the
scale-invariant ratio $(-\delta_T d/\delta_T u)$ which matches that obtained in
simple quark models, even though the individual charges are themselves
different. The proton's tensor charges can be used to constrain extensions of
the Standard Model using empirical limits on nucleon electric dipole moments.

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The categories of this paper are: dg-ga
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The categories of this paper are: hep-ex
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The categories of this paper are: nucl-ex
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The categories of this paper are: q-fin
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The categories of this paper are: eess
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The categories of this paper are: atom-ph
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The categories of this paper are: quant-ph
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The categories of this paper are: patt-sol
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The categories of this paper are: cmp-lg
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The categories of this paper are: hep-th
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The categories of this paper are: math
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The categories of this paper are: solv-int
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The categories of this paper are: stat
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The categories of this paper are: math-ph
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The categories of this paper are: bayes-an
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The categories of this paper are: alg-geom