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DTSTAMP:20260802T035429Z
LAST-MODIFIED:20121116T203436Z
DTSTART:20100302T203000Z
DTEND:20100302T213000Z
UID:event609@bu.edu
URL:http://physics.bu.edu/internal/events/show/609
SUMMARY:Searching for Physics Beyond the Standard Model Through Dipole Inte
	ractions
DESCRIPTION:Featuring Lee Roberts\, Boston University\nPoster: http://physi
	cs.bu.edu/internal//posters/2010_Spring/06_Roberts.pdf\n\nPart of the Physi
	cs Department Colloquia Series.\n\nAbstract: I will review physics of the e
	lectric and magnetic dipole operators\, first focusing on the history\, whi
	ch is intimately tied to the development of the standard model\, and then o
	n the searches for physics beyond the Standard Model using the dipole inter
	action. The measurement of magnetic dipoles of elementary particles began w
	ith the experiments of Stern and Gerlach\, which eventually told us that th
	e g‐factor for spin was 2. Refined investigations showed that gs > 2\, wh
	ich resulted in the first "quantum loop" calculation by Schwinger. The magn
	etic anomalies\, a=(g‐2)/2 of the electron and muon are now known to a re
	lative precisions of ±0.23 parts per billion and ±0.54 parts per million 
	respectively\, and there appears to be a several sigma difference between t
	he measured muon anomaly and the Standard‐Model value. The related electr
	ic dipole moment (EDM)\, which is forbidden by parity and time reversal sym
	metries (and by implication the combination of charge conjugation‐parity)
	\, has been searched for down to sensitivities of ~10-26 e‐cm and ~10‐1
	9 e‐cm\, with no hint of a signal. Since the Standard‐Model EDM is < 10
	‐36 e‐cm\, the experimental observation of an EDM would signify the pre
	sence of new physics\, and a new\, non‐Standard‐Model source of CP viol
	ation\, which is needed to explain the predominance of matter over anti‐m
	atter in the universe. Observation of the related Standard‐Model forbidde
	n process μ+ → e+ γ\, or the spontaneous conversion of a muon to an ele
	ctron in the field of an atomic nucleus\, which could also go through a dip
	ole operator\, would unambiguously signify the presence of New Physics: Cha
	rged lepton flavor violation.
LOCATION: \, \, 
STATUS:CONFIRMED
CLASS:PUBLIC
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