Chinese Physics C > 2010, Vol. 34 > Issue(6): 741-744 DOI: 10.1088/1674-1137/34/6/021

Status of the Fermilab muon (g－2) experiment

Department of Physics, Boston University, Boston, MA 02215, USA

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The New Muon (g－2) Collaboration at Fermilab has proposed to measure the
anomalous magnetic moment of the muon, a_μ, a factor of four better than was done in E821 at the Brookhaven AGS, which obtained a_μ=[116 592 089 (63)]× 10^－11±0.54 ppm. The last digit of a_μis changed from the published value owing to a new value of the ratio of the muon-to-proton magnetic moment that has become available. At present there appears to be a difference between the Standard-Model value and the measured value, at the ~3 standard deviation level when electron-positron annihilation data are used to determine the lowest-order hadronic piece of the Standard Model contribution. The improved experiment, along with further advances in the determination of the hadronic contribution, should clarify this difference. Because of its ability to constrain the interpretation of discoveries made at the LHC, the improved measurement will be of significant value, whatever discoveries may come from the LHC.

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Lee Roberts, on behalf, of the and New Muon. Status of the Fermilab muon (g－2) experiment[J]. Chinese Physics C, 2010, 34(6): 741-744. doi: 10.1088/1674-1137/34/6/021

Lee Roberts, on behalf, of the and New Muon. Status of the Fermilab muon (g－2) experiment[J]. Chinese Physics C, 2010, 34(6): 741-744. doi:10.1088/1674-1137/34/6/021 shu

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Received: 2010-02-05
Revised: 1900-01-01

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沈阳化工大学材料科学与工程学院沈阳 110142

Status of the Fermilab muon (g－2) experiment

Corresponding author:Lee Roberts,

Department of Physics, Boston University, Boston, MA 02215, USA

Received Date:2010-02-05
Accepted Date:1900-01-01
Available Online:2010-06-05

Abstract:

The New Muon (g－2) Collaboration at Fermilab has proposed to measure the
anomalous magnetic moment of the muon, a_μ, a factor of four better than was done in E821 at the Brookhaven AGS, which obtained a_μ=[116 592 089 (63)]× 10^－11±0.54 ppm. The last digit of a_μis changed from the published value owing to a new value of the ratio of the muon-to-proton magnetic moment that has become available. At present there appears to be a difference between the Standard-Model value and the measured value, at the ~3 standard deviation level when electron-positron annihilation data are used to determine the lowest-order hadronic piece of the Standard Model contribution. The improved experiment, along with further advances in the determination of the hadronic contribution, should clarify this difference. Because of its ability to constrain the interpretation of discoveries made at the LHC, the improved measurement will be of significant value, whatever discoveries may come from the LHC.