Search for large extra dimensions in final states containing one photon or jet and large missing transverse energy produced in p-pbar collisions at sqrt(s) = 1.96 TeV

Abstract

We present the results of searches for large extra dimensions in samples of events with large missing transverse energy and either a photon or a jet produced in p-pbar collisions at sqrt(s) = 1.96 TeV collected with the CDF II detector. For gamma + missing Et and jet + missing Et candidate samples corresponding to 2.0 fb^-1 and 1.1 fb^-1 of integrated luminosity respectively, we observe good agreement with standard model expectations and obtain a combined lower limit on the fundamental parameter of the large extra dimensions model, Md, as a function of the number of extra dimensions in the model.

Figures (3)

• Figure 1: Predicted (solid) and observed (crosses) photon $E_T$ distributions for the $\gamma$ + $E\!\!\!\!/_{\rm T}$ candidate sample. The last bin shows all events containing a photon with $E_T >$ 180 GeV. The expected LED signal for the case of $n =$ 4 and $M_D =$ 0.8 TeV is also shown. The kinematic region above 90 GeV is used for constraining the ADD model. The hatched region indicates the total uncertainty on the combined background prediction.
• Figure 2: Predicted and observed leading jet $E_T$ distributions for the jet + $E\!\!\!\!/_{\rm T}$ candidate sample. The expected LED signal contribution for the case of $n =$ 2 and $M_D =$ 1.0 TeV is also shown.
• Figure 3: 95 % C.L. lower limits on $M_D$ in the ADD model as a function of the number of extra dimensions in the model.