Technical Design Report for the Paul Scherrer Institute Experiment R-12-01.1: Studying the Proton "Radius" Puzzle with $\mu p$ Elastic Scattering - INSPIRE

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Technical Design Report for the Paul Scherrer Institute Experiment R-12-01.1: Studying the Proton "Radius" Puzzle with $\mu p$ Elastic Scattering

MUSE

Collaboration

•

R. Gilman
(
- Rutgers U., Piscataway
)

Sep 27, 2017

105 pages

e-Print:

1709.09753 [physics.ins-det]

Experiments:

PSI-R-12-01

View in:

ADS Abstract Service

reference search71 citations

Citations per year

Abstract: (arXiv)

The difference in proton radii measured with

\mu p

atoms and with

ep

atoms and scattering remains an unexplained puzzle. The PSI MUSE proposal is to measure

\mu p

and

e p

scattering in the same experiment at the same time. The experiment will determine cross sections, two-photon effects, form factors, and radii independently for the two reactions, and will allow

\mu p

and

ep

results to be compared with reduced systematic uncertainties. These data should provide the best test of lepton universality in a scattering experiment to date, about an order of magnitude improvement over previous tests. Measuring scattering with both particle polarities will allow a test of two-photon exchange at the sub-percent level, about a factor of four improvement on uncertainties and over an order of magnitude more data points than previous low momentum transfer determinations, and similar to the current generation of higher momentum transfer electron experiments. The experiment has the potential to demonstrate whether the

\mu p

and

ep

interactions are consistent or different, and whether any difference results from novel physics or two-photon exchange. The uncertainties are such that if the discrepancy is real it should be confirmed with

\approx

5

\sigma

significance, similar to that already established between the regular and muonic hydrogen Lamb shift.

activity report
exchange: two-photon
lepton: universality
hydrogen: muonic atom
muon p: elastic scattering
form factor
Lamb shift
proposed experiment

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