Etmiss reconstruction and calibration

Etmiss reconstruction and calibration is performed in the MissingEt package.

ETMiss is calculated from the energy deposed in all calorimeter cells and from muons. A correction is applied for the energy lost in the cryostat ( MET_EtMissFinal).

  • The calorimeter cell energy can be calibrated in various different ways:
    • H1-stylecalibration: an H1 weight is applied, depending on cell energy density (E/V) and on the calorimeter region. H1-weights are optimized from jets. Different H1-weights are available for G3 and G4 simulated data and for different detector configuration
    • weights from Local Hadron Calibration of Topoclusters are applied
    • Refined calibration: apply different weights to cells owning to different reconstructed objects (electrons, jets,...)
  • Muons reconstructed from Moore or from MuonBoy can be used.
  • The correction for the energy lost in the cryostat is calculated from the energy deposed in cryostat by jets (NOT added in case of Local Hadron Calibration, where the weights correct also for energy lost in dead materials)

  • The electronic noise suppression in calorimeters can be done or applying a cell energy threshold in term of number of sigma noise (default: abs(E)>2sigma(noise)), or using only cells in Topological clusters

  • H1-weights to be used, Muons choice, cryostat correction, Noise suppression method , criteria for the Identification of rec objects in Refined calib can be changed via jobOptions.

Default MET_EtMissFinal calculation in various releases

Starting from release 12.0.4 the Etmiss to be used for Physics is: MET_EtMissRefFinal

ETmiss is also calculated from truth particles for reference (MET_EtMissTruth).

EtMiss Evolution in the various releases

Deliverables in RELEASE 12 and 13

More on MissingET

* MissingET Basic quantities

* How To Retrieve MET objects from AOD

* ESD/AOD MET Keys

* CBNT MissingET quantities till 12.0.0 , CBNT MissingET quantities in 12.0.1 , CBNT/AACBNT MissingET quantities in 12.0.4

* Shift, Resolution, Tails...

* MissingET package Doxygen Documentation

* MissingETEvent package Doxygen Documentation

ETmiss validation

Fake ETmiss studies

* Fake muons study - Frank Paige talk at SUSY meeting 31 May 2006

* Proposal to study Etmiss tails in main calorimeter crack region

* Etmiss significance in D0 - Ariel Schwartzman thesis (pag 187)

* CaloCells "killer" code, etc

ETmiss in ATLFAST

Documentation

* Performance Documentation

* ATLAS ETmiss Talks at Conferences

EtMiss CSC note page

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Topic revision: r3 - 2007-05-17 - DonatellaCavalli
 
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