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Theory Seminars (High Energy/Cosmology) 

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Events on Thursday, February 21st, 2019
 Gravity safe, electroweak natural axionic solution to strong CP and SUSY mu problems
 Time: 2:30 pm
 Place: 5280 Chamberlin Hall
 Speaker: Howard Baer, University of Oklahoma
 Abstract: Particle physics models with PecceiQuinn (PQ) symmetry breaking as a consequence of supersymmetry (SUSY) breaking are attractive in that
they solve the strong CP problem with a SUSY DFSZlike axion,
link the SUSY breaking and PQ breaking intermediate mass scales
and can resolve the SUSY mu problem with a naturalnessrequired
weak scale mu term whilst soft SUSY breaking terms inhabit the
multiTeV regime as required by LHC sparticle mass limits and
the Higgs mass measurement.
On the negative ledger, models based on global symmetries suffer a generic gravity spoliation problem. We present two models based on the discrete Rsymmetry Z_{24}^R which may emerge from compactification of 10d Lorentzian spacetime in string theory where the mu term and dangerous proton decay and Rparity violating operators are either suppressed or forbidden while a gravitysafe PQ symmetry emerges as an accidental approximate global symmetry leading to a solution to the strong CP problem and a weakscale/natural value for the mu term.  Host: Vernon Barger
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