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BEGIN:VEVENT
DTSTAMP:20261018T061033Z
LAST-MODIFIED:20121116T203436Z
DTSTART:20110912T160000Z
DTEND:20110912T170000Z
UID:event856@bu.edu
URL:http://physics.bu.edu/internal/events/show/856
SUMMARY:Gustavo Marques Tavares - Explaining the t-tbar Asymmetry with a Li
	ght Axigluon
DESCRIPTION:\nPart of the Preliminary Oral Exam.\n\nTitle:  Explaining
	 the t-tbar Asymmetry with a Light Axigluon\n\n Examining Committee:  
	Martin Schmaltz\, John Butler\, Claudio Chamon and Andrew Cohen\n\n Abstrac
	t:\n In this talk I propose a light axigluon with flavor universal coupling
	s to quarks to explain the Tevatron t-tbar forward-backward asymmetry. In t
	his model the asymmetry arises from interference between s-channel gluon an
	d axigluon diagrams and requires a relatively weakly coupled axigluon (g_{a
	xi} = g_{qcd}/3). Axigluon-gluon interference does not contribute to the t-
	tbar cross section. New contributions to the cross section arise only at fo
	urth order in the axigluon coupling and are very small for a sufficiently b
	road axigluon. I will also present possible UV completions of the phenomeno
	logical axigluon which explain the required small couplings and large width
	. Such UV completions necessarily contain new colored fermions or scalars b
	elow the axigluon mass and predict multi-jet events with large cross sectio
	ns at the Tevatron and LHC.
LOCATION:PRB 595\, 3 Cummington Mall\, 02215
STATUS:CONFIRMED
CLASS:PUBLIC
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