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BEGIN:VEVENT
DTSTAMP:20260915T045701Z
LAST-MODIFIED:20121116T203436Z
DTSTART:20120124T203000Z
DTEND:20120124T213000Z
UID:event353@bu.edu
URL:http://physics.bu.edu/internal/events/show/353
SUMMARY:Final Results from MuLan: A High Energy Experiment with Low Energy 
	Muons
DESCRIPTION:Featuring Robert Carey\, Boston University\nHosted by: Rama Ban
	sil\nPoster: http://physics.bu.edu/posters/2012_Spring/01_Carey.pdf\n\nPart
	 of the Physics Department Colloquia Series.\n\nAbstract: Three of the most
	 important inputs to the Standard Model of Elementary particle physics are 
	the fine structure constant\, \, the mass of the Z and the Fermi constant\,
	 GF \, the last of which is determined through measurements of the muon lif
	etime. Until 1999\, incomplete theoretical calculations limited the precisi
	on with which GF could be extracted from experiment. When van Ritbergen and
	 Stuart finished their work on the missing radiative corrections in 1999\, 
	the precision was entirely limited by knowledge of the muon lifetime\, pavi
	ng the way for a new measurement. After several years of technical developm
	ent\, the MuLan experiment\, sited at the Paul Scherrer Institut (Villigen\
	, Switzerland)\, was commissioned in 2004. The collaboration staged major p
	roduction runs in 2004\, 2006 and 2007. Our first result appeared in 2007. 
	The final result (1 ppm on τμ\, 0.6 ppm on GF ) is the most precise 
	particle lifetime measurement ever made. In my talk\, I will explain how th
	is very simple measurement is made and describe our strategies for controll
	ing the systematic errors. I hope to convince you that it is still possible
	 to do interesting and important experiments in particle physics with a rel
	atively small budget.
LOCATION:SCI 109\, 590 Commonwealth Avenue\, 02215
STATUS:CONFIRMED
CLASS:PUBLIC
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