The Status and Prospects of the Muon $g-2$ Experiment at Fermilab
- Washington U., Seattle
The E989 Muon $g-2$ Experiment at Fermilab aims to measure the muon magnetic anomaly, $$a_\mu$$, to an unprecedented precision of 140 parts per billion (ppb), representing a four-fold improvement over the current best measurement, achieved at Brookhaven National Lab. There stands a greater than 3 standard deviations discrepancy between the Brookhaven measurement of $$a_\mu$$ and the theoretical value predicted using the Standard Model. The Fermilab experiment seeks to either resolve or confirm this discrepancy, which is suggestive of new physics interactions. To achieve the E989 target precision, the anomalous precession frequency of muons in a magnetic storage ring must be determined with a systematic uncertainty below 70\,ppb, and the average magnetic field experienced by these stored muons must be known equally well. The muon anomalous precession frequency is imprinted on the time-dependent energy distribution of decay positrons observed by 24 electromagnetic calorimeters. A suite of pulsed NMR probes continually monitors the magnetic field. This document presents the current status of the Fermilab experiment while emphasizing the ongoing analysis of the 2018 Run 1 dataset and the systematic effects that complicate it.
- Research Organization:
- Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), High Energy Physics (HEP)
- Contributing Organization:
- Muon g-2
- DOE Contract Number:
- AC02-07CH11359
- OSTI ID:
- 1545100
- Report Number(s):
- arXiv:1905.05318; FERMILAB-CONF-19-207-E; 1734928
- Resource Relation:
- Conference: 54th Rencontres de Moriond on QCD and High Energy Interactions, La Thuile, Italy, 03/23-03/30/2019
- Country of Publication:
- United States
- Language:
- English
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