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SUMMARY:The hadronic light-by-light scattering contribution to the muon g-
2 from lattice QCD
DTSTART;VALUE=DATE-TIME:20180502T133000Z
DTEND;VALUE=DATE-TIME:20180502T143000Z
DTSTAMP;VALUE=DATE-TIME:20200809T155432Z
UID:indico-event-725444@indico.cern.ch
DESCRIPTION:The anomalous magnetic moment of the muon is one of the most p
romising observables to identify hints for physics beyond the Standard Mod
el of particle physics. This quantity exhibits a persistent discrepancy of
3.5 standard deviations between the direct measurement by the Brookhaven
E821 Collaboration and its theoretical prediction based on the Standard Mo
del. The theory error is now completely dominated by effects of the strong
interaction and in particular by the hadronic light-by-light scattering (
HLbL) contribution.\n\nI will present two complementary approaches to eval
uate this contribution using lattice QCD calculations. In the first approa
ch\, lattice QCD can provide valuable inputs to the recently proposed disp
ersive framework where experimental data are often missing. In this case\,
the dominant contribution is given by the pion-pole contribution\, that c
an be evaluated on the lattice. Information about other resonances can be
obtained from the study of the forward light-by-light scattering amplitude
s on the lattice. The second approach corresponds to the direct lattice QC
D calculation of the full HLbL contribution where the final result is expr
essed as a convolution between a QED kernel\, computed semi-analytically i
n position space and in infinite volume\, and a four point correlation fun
ction computed on the lattice.\n\nhttps://indico.cern.ch/event/725444/
LOCATION:CERN 4/3-006 - TH Conference Room
URL:https://indico.cern.ch/event/725444/
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