Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Finite Volume Corrections to the Electromagnetic Mass of Composite
  Particles   The long-range electromagnetic interaction presents a challenge for numerical
computations in QCD + QED. In addition to power-law finite volume effects, the
standard lattice gauge theory approach introduces non-locality through removal
of photon zero-momentum modes. The resulting finite volume effects must be
quantitatively understood; and, to this end, non-relativistic effective field
theories are an efficient tool, especially in the case of composite particles.
Recently an oddity related to non-locality of the standard lattice approach was
uncovered by the Budapest-Marseille-Wuppertal collaboration. Explicit
contributions from antiparticles appear to be required so that finite volume
QED results for a point-like fermion can be reproduced in the effective field
theory description. We provide transparency for this argument by considering
point-like scalars and spinors in finite volume QED using the method of
regions. For the more germane case of composite particles, we determine that
antiparticle modes contribute to the finite-volume electromagnetic mass of
composite spinors through terms proportional to the squares of time-like form
factors evaluated at threshold. We extend existing finite volume calculations
to one order higher, which is particularly relevant for the electromagnetic
mass of light nuclei. Additionally, we verify that the analogous finite volume
contributions to the nucleon mass in chiral perturbation theory vanish in
accordance with locality.

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The categories of this paper are: supr-con
23
The categories of this paper are: solv-int
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The categories of this paper are: q-fin
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The categories of this paper are: ao-sci
32
The categories of this paper are: atom-ph
15
The categories of this paper are: nucl-ex
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The categories of this paper are: patt-sol
36
The categories of this paper are: cmp-lg
4
The categories of this paper are: cond-mat
28
The categories of this paper are: alg-geom
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The categories of this paper are: mtrl-th
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The categories of this paper are: q-alg
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The categories of this paper are: eess
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The categories of this paper are: chao-dyn
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The categories of this paper are: acc-phys
9
The categories of this paper are: nlin