Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Rescattering effects in the hadronic-light-by-light contribution to the
  anomalous magnetic moment of the muon   We present a first model-independent calculation of $\pi\pi$ intermediate
states in the hadronic-light-by-light (HLbL) contribution to the anomalous
magnetic moment of the muon $(g-2)_\mu$ that goes beyond the scalar QED pion
loop. To this end we combine a recently developed dispersive description of the
HLbL tensor with a partial-wave expansion and demonstrate that the known
scalar-QED result is recovered after partial-wave resummation. Using dispersive
fits to high-statistics data for the pion vector form factor, we provide an
evaluation of the full pion box, $a_\mu^{\pi\text{-box}}=-15.9(2)\times
10^{-11}$. We then construct suitable input for the $\gamma^*\gamma^*\to\pi\pi$
helicity partial waves based on a pion-pole left-hand cut and show that for the
dominant charged-pion contribution this representation is consistent with the
two-loop chiral prediction and the COMPASS measurement for the pion
polarizability. This allows us to reliably estimate $S$-wave rescattering
effects to the full pion box and leads to our final estimate for the sum of
these two contributions: $a_\mu^{\pi\text{-box}} +
a_{\mu,J=0}^{\pi\pi,\pi\text{-pole LHC}}=-24(1)\times 10^{-11}$.

31
The categories of this paper are: ao-sci
6
The categories of this paper are: astro-ph
21
The categories of this paper are: adap-org
1
The categories of this paper are: cs
9
The categories of this paper are: nlin
13
The categories of this paper are: quant-ph
10
The categories of this paper are: q-bio
16
The categories of this paper are: stat
20
The categories of this paper are: acc-phys
36
The categories of this paper are: cmp-lg
15
The categories of this paper are: nucl-ex
19
The categories of this paper are: eess
35
The categories of this paper are: mtrl-th
22
The categories of this paper are: chao-dyn
3
The categories of this paper are: physics
34
The categories of this paper are: chem-ph