MRI Consortium: Development of Instrumentation to Measure the Spin Precession Frequency in the Fermilab Muon g-2 Experiment

Overview: The new g-2 Experiment aims to resolve the discrepancy between the Standard Model theory and experimental measurement of the muon anomalous magnetic moment, a. The measurement hinges on a precise measurement of the anomalous precession frequency, !a. This proposal is for the calorimeter to collect the data from which the value !a will be extracted. The calorimeter will be installed alongside the g-2 Muon storage ring at Fermi National Accelerator Laboratory in Batavia, Illinois. Intellectual Merit: A recent triumph for the standard model was the discovery of a boson with a mass of 125 GeV/c2. This value was predicted through precision frontier measurements of standard model parameters and directly observed by energy frontier experiments. With this piece of the standard model in place the eld of particle physics has entered a new era. Discoveries such as neutrino mass demonstrate that the standard model is incomplete. So far the energy frontier has not provided any clues as to what the next step may be. Therefore the role of the precision measurement frontier is critical to move the eld forward. The measurement of a has been a crucible for the Standard Model for decades and is still relevant today. The most recent measurement of this value is at odds with the theoretical prediction. The signicance of this discrepancy is 3.6 , not enough to indicate denitive evidence or rule out the possibility of new physics. Eorts are underway to improve the theoretical prediction of a through better understanding of hadronic vacuum polarization and light by light scattering. And the Department of Energy has charged the new g-2 Experiment to improve the precision of the experimental determination of a. Taken together these improvements will either validate the standard model or indicate the presence of new physics. The physics community is very interested in this measurement. The nal report from the previous measurement of a, published in 2006, was cited more in 2012 than any other year. Broader Impact: We involve students in a variety of rare opportunities to design state of the art detectors, electronics and DAQ for modern particle physics experiments. We distribute our work to others in the eld who might have similar needs, as many of our developments represent the new technologies people seek WFDs, SiPMs, GPUs, We host Workshops on Intensity Frontier instrumentation (give talks here; list). We have summer programs. We employ our previous MRI equipment in Modern Physics lab experiments. We focus on two main impacts: new technology development (design and build and use WFDs,use SiPMs,GPU computing) , and educational advancement, both at university level PhDs, BSs, as well as outreach to elementry/middle/high schools.