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VERSION:2.0
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PRODID:UW-Madison-Physics-Events
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SEQUENCE:0
UID:UW-Physics-Event-1503
DTSTART:20090410T193000Z
DTEND:20090410T203000Z
DTSTAMP:20260420T111925Z
LAST-MODIFIED:20090403T153815Z
LOCATION:5280 Chamberlin Hall
SUMMARY:Light Higgsino-LSP Scenario in the BMSSM\, Theory/Phenomenolog
 y Seminar\, Jeonghyeon Song\, Konkuk University\, Seoul\, Korea
DESCRIPTION:The modest addition of the dimension-5 term lambda(H_u.H_d
 )^2/M to the superpotential of the Minimal Supersymmetric Standard Mod
 el (MSSM) originated from physics beyond the MSSM (BMSSM) has a signif
 icant impact on the scenario of the Higgsino-dominated neutralino stat
 e being the lightest supersymmetric particle (LSP). It increases the m
 ass difference between the LSP and the lighter chargino as well as tha
 t between the LSP and the second-lightest neutralino. This enhances th
 e LHC discovery potential of the chargino and neutralino decays\, prod
 ucing more energetic charged leptons or pions than the decays without 
 the BMSSM corrections. Furthermore\, the coannihilation between the li
 ghter chargino or second-lightest neutralino and the LSP is reduced su
 bstantially such that the LSP mass does not have to be very heavy. Con
 sequently\, an almost pure Higgsino LSP with its mass ~100 GeV in the 
 BMSSM can account for all the relic density of cold dark matter in the
  Universe unless tan(beta) is too large. 
URL:https://www.physics.wisc.edu/events/?id=1503
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