Large Jet Multiplicities and New Physics at the LHC

Abstract

We consider a search strategy for new physics at the Large Hadron Collider which focuses on the signature of many jets and missing transverse energy, but no charged leptons. We show that this signature can be useful in probing a wide class of models, including natural supersymmetry, in which dark matter is produced in conjunction top quarks. As an example, we apply this strategy to a simplified supersymmetric model with a light gluino, light stop and light neutralino. The efficacy of this strategy is comparable to (and in some cases better than) that of other strategies which require charged leptons and/or b-tagged jets.

Production Yield of Muon-Induced Neutrons in Lead

“…As astronomical observation favours a weakly interacting LSP, the strong interaction particles have to decay. Their cascade decay to the LSP would cause a high jet ( j) multiplicity as signature [174,221]. The signature for the LSP would be missing transverse energy ( / E T ) in the final state accompanied by standard model particles [174].…”

Learning how to count: a high multiplicity search for the LHC

“…Instead, the backgrounds are generated in different p T bins of the heavy particle, p T heavy , where a heavy particle is any one of t, W ± , Z 0 , or H 0 . 4 This ensures that the regions of phase space that result in the largest contamination of the signal region are computed with sizeable significance. Another important consideration is that events with small p T heavy can still have large H T as a consequence of high jet activity.…”

“…ref. [1]), but more recently high multiplicity searches have been advocated as an effective technique for helping to probe scenarios with natural supersymmetry as well as those with baryonic R-parity violating supersymmetry [2][3][4][5][6][7][8][9][10][11][12]. High multiplicity final states also arise in theories of strong dynamics where new colored objects can produce four to eight top quarks through the production of "coloron" vector resonances or colored technipions [13,14].…”