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UED Observables at the LHC

UED Observables at the LHC. UED Observables at the LHC?. Level 1 Discovery Potential 4 leptons + missing energy Neutral LKP escapes detection Level 2 Discovery Potential f 0 f 0 → Z ** → l + l - Dijet Production enhancement at high E CM Exchange of gluon excitations g (2n).

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UED Observables at the LHC

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  1. UED Observables at the LHC

  2. UED Observables at the LHC? • Level 1 Discovery Potential • 4 leptons + missing energy • Neutral LKP escapes detection • Level 2 Discovery Potential • f0 f0 → Z**→ l +l - • Dijet Production enhancement at high ECM • Exchange of gluon excitations g(2n)

  3. UED Level 1 Discovery • 4 leptons + missing energy • Q* pair production each decaying to V+j • WWjj, WZjj, ZZjj • ZZjj most promising with 4 charged leptons in final state • Each jet carries a LKP escaping detection, carrying away readily discernible missing energy

  4. Level 1 Discovery Diagrams pp collider → gluon fusion strongest channel for high PT events

  5. Existing Analysis for • hep-ph/0205314 Matchev, Cheng, and Schmaltz provide some analysis results

  6. Discovery Reach hep-ph/0205314 Matchev, Cheng, and Schmaltz • LHC can resolve with 5σ statistics missing ET events if R < 1 TeV after the first year (low luminosity = 10 fb-1) • LHC will be able to 5σ resolve missing ET events after 2nd year (@ high luminosity) if R<1.5 TeV

  7. UED Level 2 Signature Z(2)→l +l - • 2nd KK level excitation should still be accessible at LHC with mass ~2 TeV • KK parity conservation allows pair production through even /Z excitations • f0 f0 → Z(2) → l +l -

  8. Dijet Production • At high ECM, gluon excitations enhance jet production through virtual gluon exchange • Polessello, Laforge, Ferrag, Escalier, Balazs (hep-ph/0402295 pg. 95) have performed a PYTHIA simulation of these processes

  9. Dijet Production Left: Number of dijets vs. transverse momentum Pt Right: KK contribution to the cross section

  10. Servant, Tait • Hep-ph/0206071

  11. Prediction for ΩB(1)h2 • hep-ph/0206071 • Graph plotted in 2002 – slightly outdated • Lower band should span 0.09 to 0.13 corresponding to m = 750 - 950 GeV, using latest WMAP results

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