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
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[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
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