Measurement of the Muon Anomalous Magnetic Moment to 0.7 ppm Results from the Data of 2000 Yannis K. Semertzidis Brookhaven National Lab Muon g-2 Collaboration.

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Measurement of the Muon Anomalous Magnetic Moment to 0.7 ppm Results from the Data of 2000 Yannis K. Semertzidis Brookhaven National Lab Muon g-2 Collaboration ICHEP02 Amsterdam, 31 July 2002

† † ‡ # Muon g-2 Collaboration †Spokesperson ‡Project Manager # Resident Spokesperson

The Muon Storage Ring: B ≈ 1.45T, P μ ≈3.09 GeV/c Inner Ring of Detectors High Proton Intensity from AGS Muon Injection

n=0.148 n=0.126 Field Focusing Index: n=0.137 Weak Focusing Ring. Tune Plane:

4 Billion e + with E>2GeV

5-parameter Function Not Quite Adequate. Fourier Spectrum of the Residuals: f g-2 ≈229 KHz f CBO ≈466 KHz

Modulation of N 0, A, with f cbo :

Amplitudes of A N, A A, A, Consistent with Values from MC Simulations. Modulation of N 0, A, with f cbo :

Fit dN/dt of each Detector Separately with the 5-parameter (ideal) Function. Then Fit ω a versus Detector: Straight line fit: χ 2 /dof=59/21, ω a /2π= ±0.14 Hz Sine wave fit: χ 2 /dof=24/19, ω a /2π= ±0.14 Hz

Fit dN/dt with the 5-parameter Function including the Modulation of N 0, A, with f cbo. Fit ω a versus Detector: Straight line fit: χ 2 /dof=24/21, ω a /2π= ±0.16 Hz

Function Modulating N 0, A, with f cbo. Four Independent Analyses of ω a Using Various Studies:

Function Modulating N 0, A, with f cbo. Function Modulating N 0, A with f cbo. Four Independent Analyses of ω a Using Various Studies:

Function Modulating N 0, A, with f cbo. Function Modulating N 0, A with f cbo. Strobing the data at f cbo ; ω a Becomes Independent of f cbo. Four Independent Analyses of ω a Using Various Studies:

Function Modulating N 0, A, with f cbo. Function Modulating N 0, A with f cbo. Strobing the data at f cbo ; ω a Becomes Independent of f cbo. Ratio Method; ω a Becomes Independent of Slow Effects, e.g. Muon Losses. Four Independent Analyses of ω a Using Various Studies:

Function Modulating N 0, A, with f cbo. Function Modulating N 0, A with f cbo. Strobing the data at f cbo ; ω a Becomes Independent of f cbo. Ratio Method; ω a Becomes Independent of Slow Effects, e.g. Muon Losses. Four Independent Analyses of ω a Using Various Studies: Systematic Uncertainties for the ω a Analysis. Source of Errors Size [ppm] Coherent Betatron Oscillations (CBO) Pileup Gain Changes Lost Muons Binning & Fitting Procedure Others Total

Magnetic Field Measurement Systematic Uncertainties for the ω p Analysis. Source of Errors Size [ppm] Absolute Calibration of Standard Probe Calibration of Trolley Probe Trolley Measurements of B-field Interpolation with Fixed Probes Uncertainty from Muon Distribution Others Total

Computation of a μ : Analyses of ω a and ω p are Separate and Independent (“Blind Analysis”). When Ready, only then, Offsets are Removed and a μ is Computed.

Theory (a μ )×10 10 Results a μ (SM)= (7)× (0.6 ppm) See, e.g., review article by J. Hisano, hep-ph/ Also talks by Z. Bern and T. Teubner at ICHEP02 Caution: More a μ (SM) out there and more to come!

Results From the Data of 2000: a μ (exp)= (7)(5)× (0.7 ppm) Exp. World Average: a μ (exp)= (8)× (0.7 ppm) (a μ )× World Average Theory

Results From the Data of 2000: a μ (exp)= (7)(5)× (0.7 ppm) Exp. World Average: a μ (exp)= (8)× (0.7 ppm) (a μ )× World Average Aa aa Theory w/out EW Correction! an

Outlook In 2001 we have collected 3 Billion electrons with E>2GeV from a run with negative muons (μ - ). Run at n=0.122 and n= We have scientific approval for more running time aiming to collect an extra 6 Billion electrons. However, the President’s budget does not include running time for the AGS & now is in Congress’ hands.

Outlook In 2001 we have collected 3 Billion electrons with E>2GeV from a run with negative muons (μ - ). Run at n=0.122 and n= We have scientific approval for more running time aiming to collect an extra 6 Billion electrons. However, the President’s budget does not include running time for the AGS & now is in Congress’ hands.

Summary: a μ (exp)= (8)× (0.7 ppm); Sensitive to EW Contribution. Have 3 Billion electrons with E>2GeV from the 2001 run (μ - ). New evaluation of a μ (SM) is to be announced soon by Davier, Eidelman, et al., including new e + e - data. More data from Novosibirsk, Beijing, … will even further improve knowledge of a µ (had1). Stay Tuned!

Summary: a μ (exp)= (8)× (0.7 ppm); Sensitive to EW Contribution. Have 3 Billion electrons with E>2GeV from the 2001 run (μ - ). New evaluation of a μ (SM) is to be announced soon by Davier, Eidelman, et al., including new e + e - data. More data from Novosibirsk, Beijing, … will even further improve knowledge of a µ (had1). Stay Tuned!

Summary: a μ (exp)= (8)× (0.7 ppm); Sensitive to EW Contribution. Have 3 Billion electrons with E>2GeV from the 2001 run (μ - ). New evaluation of a μ (SM) is to be announced soon by Davier, Eidelman, et al., including new e + e - data. More data from Novosibirsk, Beijing, … will even further improve knowledge of a µ (had1). Stay Tuned!