Abstract
We report on a search for large extra dimensions in a data sample of approximately 1 fb(-1) of pp[over] collisions at sqrt s=1.96 TeV. We investigate Kaluza-Klein graviton production with a photon and missing transverse energy in the final state. At the 95% C.L. we set limits on the fundamental mass scale M(D) from 884 to 778 GeV for two to eight extra dimensions.
Highlights
Z ! W ! e Noncollision Misidentified jets W Total Background DataNumber of expected events12:1 1:3 3:8 0:3 2:8 1:4 2:2 1:5 1:5 0:2 22:4 2:5the e= template is obtained from a data sample of isolated electrons.The total number of background events from misidentified jets (Nmisid) can be predicted from the fake photon sample based on the rates at which jets, passing all other photon identification criteria, fail or pass the track isolation requirement
We first determine the number of events (N1) in the sample that fail the track isolation requirement
We fit the DCA distribution of the events that pass the track isolation to a linear sum of the e= and misidentified jets templates in order to extract the number of misidentified jets (N2) passing the track isolation
Summary
The total number of background events from misidentified jets (Nmisid) can be predicted from the fake photon sample based on the rates at which jets, passing all other photon identification criteria, fail or pass the track isolation requirement. We fit the DCA distribution of the events that pass the track isolation to a linear sum of the e= and misidentified jets templates in order to extract the number of misidentified jets (N2) passing the track isolation. We fit the DCA distribution in the photon sample to a linear sum of the three templates, fixing the contribution of misidentified jets as described above, and determine the e= and noncollision contributions. The LED signal is stacked on top of SM backgrounds
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