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UID:UW-Physics-Event-3881
DTSTART:20160216T213000Z
DTEND:20160216T223000Z
DTSTAMP:20260420T001437Z
LAST-MODIFIED:20160216T130302Z
LOCATION:5280 Chamberlin Hall
SUMMARY:The Unnatural (or Split) Composite Higgs\, Theory Seminar (Hig
 h Energy/Cosmology)\, Tony Gherghetta\, University of Minnesota
DESCRIPTION:<br>
\nA simple way to trivially satisfy precision-electro
 weak and flavor constraints in composite Higgs models is to require a 
 large global symmetry breaking scale\, f > 10 TeV. This leads to a tun
 ing of order 10^-4 to obtain the observed Higgs mass\, but gives rise 
 to a 'split' spectrum where the strong-sector resonances with masses g
 reater than 10 TeV are separated from the pseudo Nambu-Goldstone boson
 s\, which remain near the electroweak scale. To preserve gauge-couplin
 g unification (due to a composite top quark)\, the symmetry breaking s
 cale satisfies an upper bound f < 100-1000 TeV\, which implies that th
 e resonances are not arbitrarily heavy and may be accessible at future
  colliders. Furthermore\, by identifying dark matter with a pseudo Nam
 bu-Goldstone boson\, the smallest coset space containing a stable\, sc
 alar singlet and an unbroken SU(5) symmetry is SU(7) / SU(6) x U(1). I
 nterestingly\, this coset space also contains a metastable color-tripl
 et pseudo Nambu-Goldstone boson that can decay via a displaced vertex 
 when produced at colliders\, leading to a distinctive signal of unnatu
 ralness.
URL:https://www.physics.wisc.edu/events/?id=3881
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