ExoticsHighlyExcitedStringStatesResults

Introduction

Using fully simulated data samples, we have set limits on the cross section versus lower-mass threshold for string ball production. Assuming a data sample with an integrated luminosity of 100 pb^-1 at a proton-proton centre of mass energy of 10 TeV, cross section values greater than 185 fb over the threshold mass range of 3.0 to 5.4 TeV have been excluded at the 95% confidence level. Based on a simple model for string ball production, values of the string scale of less than 1.6 TeV and the Planck scale of less than 2.4 TeV could be excluded.

Note

ATL-PHYS-PUB-2009-011

All figures

Invariant Mass Distributions

Figure 1: Reconstructed invariant mass distributions with only particle identification cuts applied. In addition, for the QCD dijet sample, the parton transverse momentum defined in the rest frame of the parton-parton scattering was required to be greater than 70 GeV.

Background Rejection

Figure 2: Reconstructed scalar sum of transverse momentum + missing transverse energy distributions.

Figure 3: Reconstructed invariant mass distributions with scalar sum of transverse momentum greater than 2.4 TeV.

Figure 4: Reconstructed invariant mass distributions with scalar sum of transverse momentum greater than 2.4 TeV and lepton p_T > 100 GeV.

Exclusion Limits

Figure 5: Cross section upper limits assuming a luminosity of 100 pb^-1.

Responsible: FabienneLedroit
Last reviewed by: Never reviewed