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Approved2010HIPlotsJetEtMiss

Etmiss Resolution in Heavy Ion Events

Introduction

A study of the ATLAS calorimeter Etmiss resolution with the 2010 Heavy Ion (HI) collision data has been performed. The results are compared to those obtained previously with proton-proton (pp) collision data in 2010.

Data Set

The data set consists of 1654 events, corresponding to an integrated luminosity of 1.7 inverse microbarns. The events are required to have:

  • a leading jet with ET > 100 GeV
  • a second leading jet in the opposite hemisphere with Δφ > π/2 and ET > 25 GeV

Etmiss is computed from cells with a 2 sigma noise cut, calibrated with Global Cell Weighting (GCW), and calculated in the pseudorapidity range |η|<4.5. A vertex correction is applied when determining Etmiss.

Contacts for these plots: Tancredi Carli, Richard Teuscher

[METLinear] Resolution vs SumET, Cell-based MET, GCW calibrated, calculated in |η|<4.5

Exmiss and Eymiss resolution as a function of the total transverse energy (ΣET) for Pb+Pb and pp collision events. For Pb+Pb, due to low statistics, RMS values are plotted instead of sigma from the fit. The line represents independent fits to the resolution obtained in Pb+Pb data and in pp data at 7 TeV ( ATLAS-CONF-2010-057). Exmiss , Eymiss and ΣET are computed from cells with energy > 2σ(noise) calibrated with Global Cell Weighting (GCW). eps file

[METLog] Resolution vs SumET (log scale on x axis) Cell-based MET GCW calibrated, calculated in |η|<4.5

Exmiss and Eymiss resolution as a function of the total transverse energy (ΣET) for Pb+Pb and pp collision events. For Pb+Pb, due to low statistics, RMS values are plotted instead of sigma from the fit. The line represents independent fits to the resolution obtained in Pb+Pb data and in pp data at 7 TeV ( ATLAS-CONF-2010-057). Exmiss , Eymiss and ΣET are computed from cells with energy > 2σ(noise) calibrated with Global Cell Weighting (GCW). A logarithmic scale is used on the X axis.eps file

Topic attachments
I Attachment History Action Size Date Who Comment
Unknown file formateps MET-HI-Linear.eps r1 manage 270.8 K 2011-01-18 - 10:56 RichardTeuscher MET-HI-Linear
GIFgif MET-HI-Linear.gif r1 manage 14.7 K 2011-01-18 - 10:46 RichardTeuscher MET-HI-Linear
Unknown file formateps MET-HI-Log.eps r1 manage 270.2 K 2011-01-18 - 10:56 RichardTeuscher MET-HI-Log
GIFgif MET-HI-Log.gif r1 manage 14.2 K 2011-01-18 - 10:47 RichardTeuscher MET-HI-Log
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Topic revision: r3 - 2011-02-04 - TancrediCarli
 
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