Abstract
The proton radius puzzle is the difference between the proton radius as measured with electron scattering and in the excitation spectrum of atomic hydrogen, and that measured with muonic hydrogen spectroscopy. The MUSE experiment seeks to resolve this puzzle by simultaneously measuring elastic electron and muon scattering on the proton, in both charge states, thereby providing new information to the puzzle. MUSE addresses issues of two-photon effects, lepton universality and, possibly, new physics, while providing simultaneous form factor, and therefore radius, measurements with both muons and electrons.
Highlights
The proton radius puzzle arose in 2010 when the CREMA collboration measured the radius of the proton using the Lamb Shift in muonic hydrogen
The proton radius puzzle is the difference between the proton radius as measured with electron scattering and in the excitation spectrum of atomic hydrogen, and that measured with muonic hydrogen spectroscopy
The MUSE experiment seeks to resolve this puzzle by simultaneously measuring elastic electron and muon scattering on the proton, in both charge states, thereby providing new information to the puzzle
Summary
The proton radius puzzle arose in 2010 when the CREMA collboration measured the radius of the proton using the Lamb Shift in muonic hydrogen. The CREMA collaboration have begun an extended measurement series on heavier nuclei, lower Q2 electron scattering experiments are planned at JLab and Mainz, and the MUSE collaboration has been formed to address the missing piece in the puzzle: elastic muon scattering on the proton. We will measure with both beam charge states, leading to a comparison of the radius as extracted simultaneously from electron and muon scattering, and a check on the contribution of two-photon-effects, which change sign with the lepton charge and are believed to cause the breakdown of the Rosenbluth separation used to extract form factors and thereby the proton charge radius from electron scattering data
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
