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ExoticsHighlyExcitedStringStatesResults

Introduction

This page shows the results of ATLAS on the search for highly-excited string states.

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

mass-all.png

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

sum.png

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

mass-cutet.png

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

acceptance.png

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

Exclusion Limits

j-thresh.png

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


Major updates:
-- FabienneLedroit - 11 May 2009
-- DougGingrich - 14 May 2009

Responsible: FabienneLedroit
Last reviewed by: Never reviewed

Topic attachments
I Attachment History Action Size Date Who Comment
PDFpdf ATL-PHYS-PUB-2009-011.pdf r1 manage 106.7 K 2009-05-14 - 22:37 DougGingrich note
Unknown file formateps acceptance.eps r1 manage 10.5 K 2009-05-14 - 22:20 DougGingrich Figure 4
PNGpng acceptance.png r1 manage 43.7 K 2009-05-14 - 22:08 DougGingrich Figure 4
Unknown file formateps j-thresh.eps r1 manage 9.4 K 2009-05-14 - 22:21 DougGingrich Figure 5
PNGpng j-thresh.png r1 manage 56.7 K 2009-05-14 - 22:09 DougGingrich Figure 5
Unknown file formateps mass-all.eps r1 manage 15.7 K 2009-05-14 - 22:12 DougGingrich Figure 1
PNGpng mass-all.png r1 manage 65.9 K 2009-05-14 - 22:04 DougGingrich Figure 1
Unknown file formateps mass-cutet.eps r1 manage 10.4 K 2009-05-14 - 22:19 DougGingrich Figure 3
PNGpng mass-cutet.png r1 manage 44.1 K 2009-05-14 - 22:07 DougGingrich Figure 3
Unknown file formateps sum.eps r1 manage 15.8 K 2009-05-14 - 22:18 DougGingrich Figure 2
PNGpng sum.png r1 manage 64.4 K 2009-05-14 - 22:06 DougGingrich Figure 2
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Topic revision: r5 - 2010-12-06 - ElmarRitsch
 
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