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DTSTAMP:20260918T221838Z
LAST-MODIFIED:20151002T141227Z
DTSTART:20151007T193000Z
DTEND:20151007T203000Z
UID:event1477@bu.edu
URL:http://physics.bu.edu/internal/events/show/1477
SUMMARY:Towards a No-Lose Theorem for Naturalness
DESCRIPTION:Featuring Prashant Saraswat\, Maryland/JHU\n\nPart of the HET S
	eminar Series.\n\nWe derive a phenomenological no-lose theorem for naturaln
	ess up to the TeV scale\, which applies when quantum corrections to the Hig
	gs mass from top quarks are canceled by perturbative BSM particles (top par
	tners) of similar multiplicity due to to some symmetry. Null results from L
	HC searches already seem to disfavor such partners if they are colored. Any
	 partners with SM charges and ~TeV masses will be exhaustively probed by th
	e LHC and a future 100 TeV collider. Therefore\, we focus on neutral top pa
	rtners. While these arise in Twin Higgs theories\, we analyze neutral top p
	artners as model-independently as possible using EFT and Simplified Model m
	ethods. We classify all perturbative neutral top partner structures in orde
	r to compute their irreducible low-energy signatures at proposed future lep
	ton and hadron colliders\, as well as the irreducible tunings suffered in e
	ach scenario. Central to our theorem is the assumption that SM-charged BSM 
	states appear in the UV completion of neutral naturalness\, which is the ca
	se in all known examples. Direct production at the 100 TeV collider then al
	lows this scale to be probed at the ~10 TeV level. We find that proposed fu
	ture colliders probe any such scenario of naturalness with tuning of 10% or
	 better. This provides very strong model-independent motivation for both ne
	w lepton and hadron colliders\, which in tandem act as discovery machines f
	or general naturalness. We put our results in context by discussing other p
	ossibilities for naturalness\, including "swarms" of top partners\, inheren
	tly non-perturbative or exotic physics\, or theories without SM-charged sta
	tes in the UV completion. Realizing a concrete scenario which avoids our ar
	guments while still lacking experimental signatures remains an open model-b
	uilding challenge.
LOCATION:PRB 595\, 3 Cummington Mall\, 02215
STATUS:CONFIRMED
CLASS:PUBLIC
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