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Searches at LHC for Physics Beyond the Standard Model. SUSY Inclusive search Backgrounds SUSY parameters Heavy long-lived particles Universal Extra Dimensions Black holes Resonances in the Drell-Yan mass distribution. Universal Extra Dimensions (UED). mass

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searches at lhc for physics beyond the standard model

Searches at LHC for Physics Beyond the Standard Model

  • SUSY
    • Inclusive search
    • Backgrounds
    • SUSY parameters
  • Heavy long-lived particles
  • Universal Extra Dimensions
  • Black holes
  • Resonances in the Drell-Yan mass distribution
universal extra dimensions ued
Universal Extra Dimensions (UED)
  • mass
    • degenerate spectrum
  • Conservation of KK parity (-1)n
    • n=1 similar to SUSY but Spin(KK) = Spin(SM)
  • 2nd excitationcan be singly produced

Long decay chains

Pair production of g1 g1 ,q1 g1 and q1 q1

Signal: 4 leptons (2 pairs OSSF), jets, and

missing energy

R. Ströhmer WIN07

universal extra dimensions ued1
Universal Extra Dimensions (UED)

CMS

preliminary

CMS

preliminary

Z veto: one OSSF

with M<5 GeV or M>80 GeV

µ: pt> 5 GeV, |η|<2.4

e: pt> 7 GeV, |η|<2.5

R. Ströhmer WIN07

rs gravitons heavy bosons

e

graviton

p

p

θ

e

RS Gravitons & Heavy Bosons

ATLAS

preliminary

Characterisation

  • Measure spin
    • G* Spin 2
    • Z’ Spin 1

5 sigma discovery

R. Ströhmer WIN07

spectacular states micro black holes
Spectacular States : Micro Black Holes
  • Large EDs
  • Micro black hole decaying via Hawking radiation
    • Photons + Jets + …
  • We will certainly know something funny is happening
    • Large multiplicities
    • Large ET
    • Large missing ET
    • Highly spherical compared to BGs
  • Theory uncertainty limits interpretation
    • Geometrical information difficult to disentangle

CMS

preliminary

Invariant mass [GeV/c2]

R. Ströhmer WIN07

sphericity

conclusions
Conclusions
  • ATLAS & CMS have significant discovery potential for physics beyond the standard model
  • New physics could already show up in early data
  • In order to claim a discovery on needs to understand the background
    • detector performance
    • standard model processes
  • discovery of “something” is only first step, the second is to distinguish between models and determine parameters

R. Ströhmer WIN07