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PRODID:UW-Madison-Physics-Events
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SEQUENCE:0
UID:UW-Physics-Event-3333
DTSTART:20140425T191500Z
DURATION:PT1H0M0S
DTSTAMP:20260308T043454Z
LAST-MODIFIED:20140424T142825Z
LOCATION:5280 Chamberlin Hall
SUMMARY:Soft R-Parity Violation\, Theory Seminar (High Energy/Cosmolog
 y)\, Yuhsin Tsai\, Univ. of California-Davis
DESCRIPTION:Supersymmetric (SUSY) models with R-parity generically pre
 dict sparticle decays with invisible neutralinos\, which yield distinc
 tive missing energy events at colliders. Since most LHC searches are d
 esigned with this expectation\, the putative bounds on sparticle masse
 s become considerably weaker if R-parity is violated so that squarks a
 nd gluinos decay to jets with large QCD backgrounds. In this talk I wi
 ll introduce a scenario in which baryonic R-parity violation (RPV) ari
 ses effectively from soft SUSY-breaking interactions. The model featur
 es a global R-symmetry that initially forbids RPV interactions\, a hid
 den R-breaking sector\, and a heavy mediator that communicates this br
 eaking to the visible sector. After R-symmetry breaking\, the mediator
  is integrated out and an effective RPV A-term arises at tree leve. Al
 though this mediator must be heavy compared to soft masses\, the model
  introduces no new hierarchy since viable RPV can arise when the media
 tor mass is near the SUSY breaking scale. In generic regions of parame
 ter space\, a light thermally-produced gravitino is stable and can be 
 a viable dark matter candidate.
URL:https://www.physics.wisc.edu/events/?id=3333
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