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PRODID:UW-Madison-Physics-Events
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UID:UW-Physics-Event-3304
DTSTART:20140228T200000Z
DURATION:PT1H0M0S
DTSTAMP:20260419T212040Z
LAST-MODIFIED:20140227T162044Z
LOCATION:5280 Chamberlin Hall
SUMMARY:Pure Gravity Mediation\, Theory Seminar (High Energy/Cosmology
 )\, Jason Evans\, University of Minnesota
DESCRIPTION:If low energy supersymmetry is realized in nature\, the ap
 parent discovery of a Higgs boson with mass around 125 GeV suggests a 
 supersymmetric mass spectrum in the TeV or multi-TeV range. Multi-TeV 
 scalar masses are a necessary component of supersymmetric models with 
 pure gravity mediation or in any model with strong moduli stabilizatio
 n. The simplest model of pure gravity mediation contains only two free
  parameters: the gravitino mass and $tan beta$. Scalar masses are univ
 ersal at some high energy renormalization scale and gaugino masses are
  determined through anomalies and depend on the gravitino mass and the
  gauge couplings.  This theory requires a relatively large graviton ma
 ss (m_{3/2} gtrsim 300 TeV) and a limited range in tan  beta simeq 1.7
 --2.5. By allowing for non-unversalities in the Higgs soft masses\, th
 e allowed range in tan beta is greatly increased which then permits sm
 allers values of m_{3/2} and makes detection of the gluino at the LHC 
 possible. Furthermore\, if one adopts a no-scale or partial no-scale s
 tructure for the K"ahler manifold\, sfermion masses may vanish at the 
 tree level. It is usually assumed that the leading order anomaly media
 ted contribution to scalar masses appears at 2-loops. However\, there 
 are at least two possible sources for 1-loop scalar masses. These may 
 arise if Pauli-Villars fields are introduced as messengers  of supersy
 mmetry breaking.  We consider the consequences of a spectrum in which 
 the scalar masses associated with the third generation are heavy (orde
 r $m_{3/2}$) with 1-loop scalar masses for the first two generations. 
 A similar spectrum is expected to arise in GUT models based on $E_7/SO
 (10)$ where the first two generations of scalars act as pseudo-Nambu-G
 oldstone bosons. Explicit breaking of this symmetry by the gauge coupl
 ings then generates one-loop masses for the first two generations. In 
 particular\, we show that it may be possible to reconcile the $g_mu - 
 2$ discrepancy with potentially observable scalars and gauginos at the
  LHC.
URL:https://www.physics.wisc.edu/events/?id=3304
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