Hadronic vacuum polarization of the muon on 2+1+1-flavor HISQ ensembles: an update

Conference · Tue Dec 21 00:00:00 EST 2021

OSTI ID:1839554

Lahert, Shaun ^[1]; DeTar, Carleton  ^[2]; El-Khadra, Aida  ^[1]; Gámiz, Elvira  ^[3]; Gottlieb, Steven  ^[4]; Kronfeld, Andreas  ^[5]; Neil, Ethan  ^[6]; Peterson, Curtis T.  ^[6]; Van de Water, Ruth  ^[5]

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1. Illinois U., Urbana
2. U. Utah, Salt Lake City
3. Granada U., Theor. Phys. Astrophys.
4. Indiana U.
5. Fermilab
6. U. Colorado, Boulder

We give an update on the status of the Fermilab Lattice-HPQCD-MILC calculation of the contribution to the muon's anomolous magnetic moment from the light-quark, connected hadronic vacuum polarization. We present preliminary, blinded results in the intermediate window for this contribution, $$a_{\mu, \textrm{W}}^{ll}$$. The calculation is performed on $$N_f =2+1+1$$ highly-improved staggered quark (HISQ) ensembles from the MILC collaboration with physical pion mass at four lattice spacings between 0.15 fm and 0.06 fm. We also present preliminary results for a study of the two-pion contributions to the vector-current correlation function performed on the 0.15 fm ensemble where we see a factor of four improvement over traditional noise reduction techniques.

• Research Organization: Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
• Sponsoring Organization: USDOE Office of Science (SC), High Energy Physics (HEP)
• Contributing Organization: Fermilab Lattice; HPQCD; MILC
• DOE Contract Number: AC02-07CH11359
• OSTI ID: 1839554
• Report Number(s): FERMILAB-CONF-21-769-T; arXiv:2112.11647; oai:inspirehep.net:1995797
• Country of Publication: United States
• Language: English