Signals for minimal supergravity at the CERN Large Hadron Collider: Multijet plus missing energy channel

Same-sign diboson signature from supersymmetry models with light Higgsinos at the LHC

In supersymmetric models with light Higgsinos (which are motivated by electroweak naturalness arguments), the direct production of Higgsino pairs may be difficult to search for at the LHC due to the low visible energy release from their decays. However, the wino pair production reaction W2(±)Z4→(W(±)Z1,2)+(W(±)W1(∓)) also occurs at substantial rates and leads to final states including equally opposite-sign and same-sign diboson production. We propose a novel search channel for LHC14 based on the same-sign diboson plus missing ET final state which contains only modest jet activity. Assuming gaugino mass unification, and an integrated luminosity ≳100  fb(-1), this search channel provides a reach for supersymmetry well beyond that from usual gluino pair production.

Dijet searches for supersymmetry at the large hadron collider

We present several strategies for searching for supersymmetry in dijet channels, using the two leading jets' momenta alone rather than the full missing transverse energy. Preliminary investigations suggest that signal-to-background ratios of at least 4-5 should be achievable at the LHC, with discovery possible for squarks as heavy as approximately 1.7 TeV.

Upper limits on sparticle masses from g -- 2 and the possibility for discovery of supersymmetry at colliders and in dark matter searches

We analyze the implications of the new physics effect seen in the g -- 2 Brookhaven measurement and show that if the effect arises from supersymmetry, then the sign of the Higgs mixing parameter mu is determined to be positive in the standard sign convention. Further, analyses within the minimal supergravity model show that the Brookhaven result leads to upper limits on the universal gaugino and scalar masses of m(1/2) < or = 800 GeV and m(0) < or = 1.5 TeV for tan beta < or = 55. Our analysis strongly suggests that supersymmetry via production of sparticles must be found at the CERN Large Hadron Collider. Further, sgn(mu) positive is favorable for the discovery of supersymmetric cold dark matter.