Physics - Medium and High Energy Seminar

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Medium & HIgh Energy Seminar: Precision measurements of the positive muon lifetime

Event Type
Seminar/Symposium
Sponsor
Medium & High Energy Physics
Location
Room 464 Loomis Lab
Date
Apr 30, 2013   1:00 pm  
Speaker
Tim Gorringe, Univ. of Kentucky.
Views
2458

I will describe the final results from two sister experiments --

MuLan and MuCap -- conducted at at Paul Scherrer Institute (PSI)

in Switzerland. In the MuLan experiment the positive muon lifetime

was measured to +/-1.0 ppm precision and used to extract the Fermi

Constant G_F to +/-0.6 ppm. In the MuCap experiment the

muonic hydrogen atom lifetime was measured to +/-10 ppm precision

and used to extract the induced pseudoscalar coupling g_p of

the proton weak interaction to +/-7%.  The results are

significant improvements in the experimental determination

of these fundamental constants and offer improved tests of

electroweak interactions (G_F) and QCD symmetries (g_p).

I will discuss our novel, low-energy, time-structured  muon beam

at PSI, the experimental challenges of part-per-million lifetime

measurements, as well as  presenting our final MuLan and MuCap results.

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