3,247 research outputs found
The measurement of muon g−2 at Fermilab
The Muon g −2 Experiment at Fermilab (E989) was built to repeat and improve the previous E821 Experiment at Brookhaven National Laboratory (BNL), aiming to reduce the experimental error by a factor of 4 to the final accuracy
of 140 parts per billion (ppb). On April 7th, 2021, the E989 collaboration published the first result based on the first year of data taking (Run-1), measuring aμ = 0.001 165 920 40(54) with a precision of 460 ppb. The measured value is consistent with the BNL measurement and strengthens the long-standing tension with the data-driven SM prediction to a combined discrepancy of 4.2σ. On the theory side,
however, new efforts involving lattice-QCD techniques are starting to question the current consensus on the theoretical prediction, demanding new improvements on
both the experimental and theoretical sides. The Muon g−2 Experiment at Fermilab has now concluded its sixth and final year of data taking, and a new result based on the Run-2 and Run-3 data was published in August 2023. This paper briefly
describes the Muon g − 2 Experiment at Fermilab and its current status
The New Muon g−2 experiment at Fermilab
AbstractThere is a long standing discrepancy between the Standard Model prediction for the muon g−2 and the value measured by the Brookhaven E821 Experiment. At present the discrepancy stands at about three standard deviations, with a comparable accuracy between experiment and theory. Two new proposals – at Fermilab and J-PARC – plan to improve the experimental uncertainty by a factor of 4, and it is expected that there will be a significant reduction in the uncertainty of the Standard Model prediction. I will review the status of the planned experiment at Fermilab, E989, which will analyse 21 times more muons than the BNL experiment and discuss how the systematic uncertainty will be reduced by a factor of 3 such that a precision of 0.14 ppm can be achieved
The Muon experiment at Fermilab
The current discrepancy between the experimental measurement
and theoretical prediction of the muon magnetic anomaly, , stands as a
potential indication of the existence of new physics. The Muon experiment
at Fermilab is set to measure with a four-fold improvement in the
uncertainty with respect to previous experiment, with an aim to determine
whether the discrepancy is well established. The experiment recently
completed its first physics run and a summer programme of essential upgrades,
before continuing on with its experimental programme. The Run-1 data alone are
expected to yield a statistical uncertainty of 350 ppb and the publication of
the first result is expected in late-2019.Comment: International Workshop on e+e- collisions from Phi to Psi (PhiPsi19),
C19-02-25, FERMILAB-CONF-19-180-E-PP
The Muon g-2 experiment at Fermilab
The upcoming Fermilab E989 experiment will measure the muon anomalous
magnetic moment . This measurement is motivated by the previous
measurement performed in 2001 by the BNL E821 experiment that reported a 3-4
standard deviation discrepancy between the measured value and the Standard
Model prediction. The new measurement at Fermilab aims to improve the precision
by a factor of four reducing the total uncertainty from 540 parts per billion
(BNL E821) to 140 parts per billion (Fermilab E989). This paper gives the
status of the experiment.Comment: Proceedings for the XIIth Quark Confinement and the Hadron Spectrum
conference (28 August 2016 to 4 September 2016
Theoretical Status of Muon (g-2)
The theoretical status of the muon anomaly is reviewed including the recent
change in the light by light hadronic correction. Specific attention is given
to the implications of the shift in the difference between the BNL experimental
result and the standard model prediction for sparticle mass limits. The
implication of the BNL data for Yukawa unification is discussed and the role of
gaugino mass nonuniversalities in the satisfaction of Yukawa unification is
explored. An analysis of the BNL constraint for the satisfaction of the relic
density constraint and for the search for dark matter is also given.Comment: 9 pages, Latex aipproc.Invited plenary talk at the Coral Gables
Conference, at Fort Lauderdale, Florida, Dec 12-16, 2001. Vernon Hughes and
Alan Krisch, session organizer
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