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CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
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SEQUENCE:2
UID:UW-Physics-Event-6557
DTSTART:20211112T213000Z
DTEND:20211112T223000Z
DTSTAMP:20260414T192155Z
LAST-MODIFIED:20211106T213526Z
LOCATION:2103 Chamberlin Hall
SUMMARY:The naturalness issue and weak scale supersymmetry in the LHC 
 era\, Physics Department Colloquium\, Howard Baer\, University of Okla
 homa
DESCRIPTION:Weak scale supersymmetry (SUSY) has been\, for many years\
 , the dominant
\nparadigm for physics beyond the Standard Model and in
  fact the simplest model
\npredicted the Higgs mass to lie exactly in 
 the range where it was discovered.
\nAnd yet the community seems disco
 uraged as to the likelihood of SUSY due to
\nlack of superpartners at 
 LHC and the somewhat large value of the Higgs mass:
\nthese are though
 t to exacerbate the ``naturalness'' question.
\nA more nuanced evaluat
 ion of electroweak naturalness points to
\na highly natural SUSY mass 
 spectrum characterized by light Higgsino states
\nwith mass ~100-300 G
 eV while the SUSY breaking scale lies
\nin the multi-TeV region. Such 
 a spectrum of superparticles seems to emerge
\nfrom simple statistical
  ideas applied to the string theory landscape of vacua.
\nThe natural 
 SUSY particle mass spectrum
\n1. gives rise to distinctive SUSY signat
 ures at LHC but
\n2. might also allow SUSY to escape LHC detection so 
 that a
\nhigher energy hadron collider may be needed.
\nThe required l
 ight higgsino states should appear at
\nan e+e- collider operating at 
 CM energy 400-600 GeV:
\nthe International Linear Collider or ILC.
\nR
 equiring naturalness also in the QCD sector\, one expects two dark mat
 ter
\nparticles: the axion along with a higgsino-like neutralino where
  typically
\nthe axion makes up the bulk of dark matter.
\nDetection o
 f a higgsino-like WIMP is ultimately expected while the axion
\nwould 
 have a suppressed coupling to photons which makes its detection
\nmore
  challenging than was previously expected.
URL:https://www.physics.wisc.edu/events/?id=6557
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