Measurement of the Positive Muon Anomalous Magnetic Moment to 0.20 ppm

Journal Article · 17 October 2023 · Phys.Rev.Lett.

DOI: https://doi.org/10.1103/PhysRevLett.131.161802 · OSTI ID:1996954

Aguillard, D. P.  ^[1]; Albahri, T.  ^[2]; Allspach, D.  ^[3]; Anisenkov, A.  ^[4]; Badgley, K.  ^[3]; Baeßler, S.  ^[5]; Bailey, I.  ^[6]; Bailey, L.  ^[7]; Baranov, V. A. ^[8]; Barlas-Yucel, E.  ^[9]; Barrett, T.  ^[10]; Barzi, E.  ^[3]; Bedeschi, F.  ^[11]; Berz, M.  ^[12]; Bhattacharya, M.  ^[3]; Binney, H. P.  ^[13]; Bloom, P.  ^[14]; Bono, J.  ^[3]; Bottalico, E.  ^[2]; Bowcock, T.  ^[2] ; Braun, S.  ^[13]; Bressler, M.  ^[15]; Cantatore, G.  ^[16]; Carey, R. M.  ^[17]; Casey, B. C.K.  ^[3]; Cauz, D.  ^[18]; Chakraborty, R.  ^[19]; Chapelain, A.  ^[10]; Chappa, S. ^[3]; Charity, S.  ^[2]; Chen, C.  ^[20]; Cheng, M.  ^[9]; Chislett, R.  ^[7]; Chu, Z.  ^[21]; Chupp, T. E.  ^[1]; Claessens, C.  ^[13]; Convery, M. E.  ^[3]; Corrodi, S.  ^[22]; Cotrozzi, L.  ^[23]; Crnkovic, J. D.  ^[3]; Dabagov, S.  ^[24]; Debevec, P. T.  ^[9]; Di Falco, S.  ^[11]; Di Sciascio, G.  ^[25]; Drendel, B.  ^[3]; Driutti, A.  ^[23]; Duginov, V. N.  ^[8]; Eads, M.  ^[26]; Edmonds, A.  ^[17]; Esquivel, J.  ^[3]; Farooq, M.  ^[1]; Fatemi, R.  ^[19]; Ferrari, C.  ^[27]; Fertl, M.  ^[28]; Fienberg, A. T.  ^[13]; Fioretti, A.  ^[27]; Flay, D.  ^[15]; Foster, S. B.  ^[17]; Friedsam, H. ^[3]; Froemming, N. S. ^[26]; Gabbanini, C.  ^[27]; Gaines, I.  ^[3]; Galati, M. D.  ^[23]; Ganguly, S.  ^[3]; Garcia, A.  ^[13]; George, J.  ^[10]; Gibbons, L. K.  ^[10]; Gioiosa, A.  ^[11]; Giovanetti, K. L.  ^[29]; Girotti, P.  ^[11]; Gohn, W.  ^[19]; Goodenough, L.  ^[3]; Gorringe, T.  ^[19]; Grange, J.  ^[1]; Grant, S.  ^[22]; Gray, F.  ^[30]; Haciomeroglu, S.  ^[2]; Halewood-Leagas, T.  ^[2]; Hampai, D.  ^[31]; Han, F.  ^[19]; Hempstead, J.  ^[13]; Hertzog, D. W.  ^[13]; Hesketh, G.  ^[7]; Hess, E. ^[11]; Hibbert, A. ^[2]; Hodge, Z.  ^[13]; Hong, K. W.  ^[32]; Hong, R.  ^[19]; Hu, T.  ^[33]; Hu, Y.  ^[34]; Iacovacci, M.  ^[35]; Incagli, M.  ^[11]; Kammel, P.  ^[13]; Kargiantoulakis, M.  ^[3]; Karuza, M.  ^[36]; Kaspar, J. ^[13]; Kawall, D.  ^[15]; Kelton, L.  ^[19]; Keshavarzi, A.  ^[37]; Kessler, D. S.  ^[15]; Khaw, K. S.  ^[33]; Khechadoorian, Z.  ^[10]; Khomutov, N. V.  ^[8]; Kiburg, B.  ^[3]; Kiburg, M.  ^[3]; Kim, O.  ^[38]; Kinnaird, N.  ^[17]; Kraegeloh, E.  ^[1]; Krylov, V. A.  ^[8]; Kuchinskiy, N. A. ^[8]; Labe, K. R.  ^[10]; LaBounty, J.  ^[13]; Lancaster, M.  ^[37]; Lee, S.  ^[39]; Li, B.  ^[40]; Li, D.  ^[41]; Li, L.  ^[34]; Logashenko, I.  ^[42]; Lorente Campos, A.  ^[19]; Lu, Z.  ^[34]; Lucà, A.  ^[3]; Lukicov, G.  ^[7]; Lusiani, A.  ^[43]; Lyon, A. L.  ^[3]; MacCoy, B.  ^[13]; Madrak, R.  ^[3]; Makino, K.  ^[12]; Mastroianni, S.  ^[44]; Miller, J. P.  ^[17]; Miozzi, S.  ^[25]; Mitra, B.  ^[38]; Morgan, J. P.  ^[3]; Morse, W. M.  ^[45]; Mott, J.  ^[3]; Nath, A.  ^[35]; Ng, J. K.  ^[33]; Nguyen, H.  ^[3]; Oksuzian, Y.  ^[22]; Omarov, Z.  ^[46]; Osofsky, R.  ^[13]; Park, S.  ^[39]; Pauletta, G. ^[18]; Piacentino, G. M. ^[25]; Pilato, R. N.  ^[2]; Pitts, K. T.  ^[19]; Plaster, B.  ^[19]; Počanić, D.  ^[32]; Pohlman, N.  ^[26]; Polly, C. C.  ^[3]; Price, J.  ^[2]; Quinn, B.  ^[38]; Qureshi, M. U.H.  ^[28]; Ramachandran, S.  ^[3]; Ramberg, E. ^[3]; Reimann, R.  ^[28]; Roberts, B. L.  ^[17]; Rubin, D. L.  ^[10]; Santi, L.  ^[18]; Schlesier, C.  ^[3]; Schreckenberger, A.  ^[3]; Semertzidis, Y. K.  ^[39]; Shemyakin, D.  ^[42]; Sorbara, M.  ^[47]; Stapleton, J.  ^[3]; Still, D. ^[3]; Stöckinger, D.  ^[48]; Stoughton, C.  ^[3]; Stratakis, D.  ^[3]; Swanson, H. E.  ^[13]; Sweetmore, G.  ^[37]; Sweigart, D. A.  ^[10]; Syphers, M. J.  ^[26]; Tarazona, D. A.  ^[10]; Teubner, T.  ^[2]; Tewsley-Booth, A. E.  ^[19]; Tishchenko, V.  ^[45]; Tran, N. H.  ^[2]; Turner, W.  ^[2]; Valetov, E.  ^[12]; Vasilkova, D.  ^[7]; Venanzoni, G.  ^[11]; Volnykh, V. P.  ^[8]; Walton, T.  ^[3]; Weisskopf, A.  ^[12]; Welty-Rieger, L. ^[3]; Winter, P.  ^[22]; Wu, Y.  ^[22]; Yu, B.  ^[38]; Yucel, M.  ^[3]; Zeng, Y.  ^[33]; Zhang, C.  ^[2]

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1. Michigan U.
2. U. Liverpool (main)
3. Fermilab
4. Novosibirsk State U.; Novosibirsk, IYF
5. Oak Ridge; Virginia U.
6. Cockcroft Inst. Accel. Sci. Tech.; Lancaster U.
7. University Coll. London
8. Dubna, JINR
9. Illinois U., Urbana
10. Cornell U.
11. INFN, Pisa
12. Michigan State U.
13. Washington U., Seattle
14. North Carolina Central U.
15. Massachusetts U., Amherst
16. Trieste U.; INFN, Trieste
17. Boston U.
18. INFN, Udine; Udine U.
19. Kentucky U.
20. Tsung-Dao Lee Inst., Shanghai; Shanghai Jiaotong U.
21. Shanghai Jiaotong U.; SKLPPC, Shanghai; Shanghai Jiao Tong U.
22. Argonne
23. Pisa U.; INFN, Pisa
24. Moscow Phys. Eng. Inst.; Frascati
25. INFN, Rome2; U. Rome 2, Tor Vergata (main)
26. Northern Illinois U.; Fermilab
27. CNR, INO, Pisa; INFN, Pisa
28. U. Mainz, PRISMA
29. James Madison U.
30. Colorado U., Denver
31. Frascati
32. Virginia U.
33. Tsung-Dao Lee Inst., Shanghai
34. Shanghai Jiaotong U.; SKLPPC, Shanghai
35. Naples U.; INFN, Naples
36. Rijeka U.
37. Manchester U.
38. Mississippi U.
39. IBS, Daejeon, CAPP
40. Hangzhou, Zhejiang U.
41. SUSTech, SKLQSE, Shenzhen
42. Novosibirsk State U.
43. Pisa, Scuola Normale Superiore
44. INFN, Naples
45. Brookhaven
46. KAIST, Taejon
47. Rome U., Tor Vergata
48. Dresden, Tech. U.

We present a new measurement of the positive muon magnetic anomaly, $a_{\mu }\equiv (g_{\mu }-2)/2$ , from the Fermilab Muon $g-2$ Experiment using data collected in 2019 and 2020. We have analyzed more than 4 times the number of positrons from muon decay than in our previous result from 2018 data. The systematic error is reduced by more than a factor of 2 due to better running conditions, a more stable beam, and improved knowledge of the magnetic field weighted by the muon distribution, ${\tilde{\omega }}_p^{\prime }$ , and of the anomalous precession frequency corrected for beam dynamics effects, ${\omega }_a$ . From the ratio ${\omega }_a/{\tilde{\omega }}_p^{\prime }$ , together with precisely determined external parameters, we determine $a_{\mu }=116592057\left(25\right)\times {10}^{-11}$ (0.21 ppm). Combining this result with our previous result from the 2018 data, we obtain $a_{\mu }\left(\mathrm{FNAL}\right)=116592055\left(24\right)\times {10}^{-11}$ (0.20 ppm). The new experimental world average is $a_{\mu }\left(\exp \right)=116592059\left(22\right)\times {10}^{-11}$ (0.19 ppm), which represents a factor of 2 improvement in precision.

• Research Organization: Rijeka U.; University Coll. London; U. Rome 2, Tor Vergata (main); James Madison U.; Dresden, Tech. U.; U. Liverpool (main); IBS, Daejeon, CAPP; Cornell U.; KAIST, Taejon; Virginia U.; Massachusetts U., Amherst; Michigan U.; Mississippi U.; Colorado U., Denver; Lancaster U.; SKLPPC, Shanghai; INFN, Pisa; Washington U., Seattle; Michigan State U.; Pisa U.; Manchester U.; Rome U., Tor Vergata; Naples U.; Kentucky U.; Dubna, JINR; Brookhaven National Laboratory (BNL), Upton, NY (United States); Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States); Tsung-Dao Lee Inst., Shanghai; Pisa, Scuola Normale Superiore; Shanghai Jiao Tong U.; Novosibirsk, IYF; Moscow Phys. Eng. Inst.; Shanghai Jiaotong U.; CNR, INO, Pisa; Illinois U., Urbana; Trieste U.; Northern Illinois U.; INFN, Rome2; Novosibirsk State U.; Cockcroft Inst. Accel. Sci. Tech.; U. Mainz, PRISMA; INFN, Udine; INFN, Trieste; Hangzhou, Zhejiang U.; Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); Argonne National Laboratory (ANL), Argonne, IL (United States); SUSTech, SKLQSE, Shenzhen; Frascati; Boston U.; INFN, Naples; Udine U.; North Carolina Central U.
• Sponsoring Organization: US Department of Energy
• Grant/Contract Number: AC02-07CH11359; 89243024CSC000002
• OSTI ID: 1996954
• Report Number(s): FERMILAB-PUB-23-385-AD-CSAID-PPD; oai:inspirehep.net:2687002; arXiv:2308.06230
• Journal Information: Phys.Rev.Lett., Journal Name: Phys.Rev.Lett. Journal Issue: 16 Vol. 131
• Country of Publication: United States
• Language: English