Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Proton Isovector Helicity Distribution on the Lattice at Physical Pion
  Mass   We present a state-of-the-art calculation of the isovector quark helicity
Bjorken-$x$ distribution in the proton using lattice-QCD ensembles at the
physical pion mass. We compute quasi-distributions at proton momenta $P_z \in
\{2.2, 2.6, 3.0\}$~GeV on the lattice, and match them systematically to the
physical parton distribution using large-momentum effective theory (LaMET). We
reach an unprecedented precision through high statistics in simulations,
large-momentum proton matrix elements, and control of excited-state
contamination. The resulting distribution with combined statistical and
systematic errors is in agreement with the latest phenomenological analysis of
the spin-dependent experimental data; in particular, $\Delta \bar{u}(x)>\Delta
\bar{d}(x)$.

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The categories of this paper are: stat
32
The categories of this paper are: atom-ph
31
The categories of this paper are: ao-sci
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The categories of this paper are: solv-int
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The categories of this paper are: funct-an
14
The categories of this paper are: math-ph
36
The categories of this paper are: cmp-lg
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The categories of this paper are: patt-sol
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The categories of this paper are: bayes-an
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The categories of this paper are: math
7
The categories of this paper are: hep-th
1
The categories of this paper are: cs
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The categories of this paper are: gr-qc
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The categories of this paper are: q-alg
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The categories of this paper are: q-bio
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The categories of this paper are: mtrl-th