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)

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

Level 1 Discovery Diagrams pp collider → gluon fusion strongest channel for high P T events

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

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

UED Level 2 Signature Z (2) →l + l - 2 nd KK level excitation should still be accessible at LHC with mass ~2 TeV KK parity conservation allows pair production through even  /Z excitations f 0 f 0 → Z (2) → l + l -

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

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

Servant, Tait Hep-ph/

Prediction for Ω B(1) h 2 hep-ph/ Graph plotted in 2002 – slightly outdated Lower band should span 0.09 to 0.13 corresponding to m = GeV, using latest WMAP results