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SUMMARY:Hadronic light-by-light contribution to $(g-2)_\\mu$ near the SU(3
)-flavor-symmetric point
DTSTART;VALUE=DATE-TIME:20200805T052000Z
DTEND;VALUE=DATE-TIME:20200805T054000Z
DTSTAMP;VALUE=DATE-TIME:20221207T160238Z
UID:indico-contribution-2082@conference-indico.kek.jp
DESCRIPTION:Speakers: En-Hung Chao (*) (Johannes Gutenberg-Universität Ma
inz)\nUnderstanding the tension between the Standard Model prediction and
the experimental results on the anomalous magnetic moment of the muon (a_\
\mu) has been an active research field over the past two decades. The theo
retical uncertainty mainly comes from the hadronic contributions\, among w
hich the hadronic light-by-light scattering ($a_\\mu^{hlbl}$) process play
s an important role. We investigate this contribution on the lattice with
a position-space approach. In our setup\, we treat separately the QED part
in the continuum and infinite volume and the QCD part on the lattice\, wh
ich helps to avoid finite-size effects due to the photon in finite-volume.
However\, noticeable finite-size effects due to long-distance physics sti
ll persist in our approach. In our recent work [arXiv:2006.16224]\, we hav
e performed computations of $a_\\mu^{hlbl}$ on the lattice with $N_f=3$ en
sembles having degenerate light and strange quark masses. Our results have
satisfactory statistical errors and allow us to concentrate on our strate
gy to control the finite-size effects using the pion-exchange contribution
. The extension of our setup to include non flavor-symmetric ensembles doe
s not require much effort\, thanks to the pre-computed single-propagator t
race in position space shared among other Mainz projects. Our work in prog
ress toward the physical point will be briefly reported\, with focus on th
e Wick-contraction topologies that vanish at the flavor-symmetric point.\n
\nhttps://conference-indico.kek.jp/event/113/contributions/2082/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2082/
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