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Muon g-2/EDM experiment at J-PARC
muon g factor $g_{\mu}$
- $-2.002 331 8418(13)$
| Numerical value | $-2.002 331 8418$ |
| Standard uncertainty | $+0.000 000 0013$ |
| Relative standard uncertainty | $6.3 \times 10^{-10}$ |
define $a_{\mu} = (g-2)_{\mu}/2$, which differs from the SM prediction by
$$\delta a_\mu = a_\mu^{{\rm exp}} - a_\mu^{{\rm SM}} = (279\pm 76)\times 10^{-11}$$
corresponding to a $3.7 \sigma$ deviation.
Muon summary
| Type | Ek | P | E |
| Slow muon (g-2, SOA) | ~/Sline | ~/Hline | G4BL |
| Slow muon (Mu1S2S, SOA) | ~/Sline | ~/Hline | G4BL |
| Surface muon | ~/Sline | 28.3 | G4BL |
| g-2 muon (J-PARC) | ~/Sline | ~/Hline | G4BL |
| g-2 muon (FNAL) | ~/Sline | ~/Hline | G4BL |