Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Radiative transitions between $0^{-+}$ and $1^{--}$ heavy quarkonia on
  the light front   We present calculations of radiative transitions between vector and
pseudoscalar quarkonia in the light-front Hamiltonian approach. The valence
sector light-front wavefunctions of heavy quarkonia are obtained from the Basis
Light-Front Quantization (BLFQ) approach in a holographic basis. We study the
transition form factor with both the traditional "good current" $J^+$ and the
transverse current $\vec J_\perp$ (in particular, $J^R=J^x+i J^y$). This allows
us to investigate the role of rotational symmetry by considering vector mesons
with different magnetic projections ($m_j=0,\pm 1$). We use the $m_j=0$ state
of the vector meson to obtain the transition form factor, since this procedure
employs the dominant spin components of the light-front wavefunctions and is
more robust in practical calculations. While the $m_j=\pm 1$ states are also
examined, transition form factors depend on subdominant components of the
light-front wavefunctions and are less robust. Transitions between states below
the open-flavor thresholds are computed, including those for excited states.
Comparisons are made with the experimental measurements as well as with Lattice
QCD and quark model results. In addition, we apply the transverse current to
calculate the decay constant of vector mesons where we obtain consistent
results using either $m_j=0$ or $m_j=1$ light-front wavefunctions. This
consistency provides evidence for features of rotational symmetry within the
model.

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The categories of this paper are: nucl-ex
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The categories of this paper are: q-alg
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The categories of this paper are: alg-geom
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The categories of this paper are: q-fin
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The categories of this paper are: cs
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The categories of this paper are: eess
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The categories of this paper are: ao-sci
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The categories of this paper are: hep-th
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The categories of this paper are: physics
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The categories of this paper are: econ
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The categories of this paper are: supr-con
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The categories of this paper are: math-ph
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The categories of this paper are: stat
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The categories of this paper are: chao-dyn
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The categories of this paper are: acc-phys
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The categories of this paper are: bayes-an