Thursday, December 9, 2010, 11:00 am — Small Seminar Room, Bldg. 510
I will discuss the MuLan collaboration's recent 1.0 part-per-million measurement of the positive muon lifetime. This measurement is over a factor of 15 more precise than any previous measurement, and is the most precise particle lifetime ever measured. The experiment used a time-structured low-energy muon beam and an array of plastic scintillators read-out by 500MHz 8-bit waveform digitizers and a fast DAQ to record over 2 x 10^12 decays. Two different muon-stopping targets were used in separate data-taking periods. The results from these two data-taking periods are in excellent agreement.
The muon lifetime gives the most precise value for the Fermi constant and is also used to extract
the mu^- p singlet capture rate, which determines the proton's weak induced
pseudoscalar coupling g_P.
Hosted by: David Jaffe
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