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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). mass

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Searches at LHC for Physics Beyond the Standard Model

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  1. 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

  2. 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

  3. 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

  4. 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

  5. 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

  6. 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

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