Slovak contribution to experiment ATLAS

Pavel Šťavina, Bratislava 2004

Slovak contribution to experiment ATLAS

Even though Slovakia is small country with limited finances we have fulfilled all our obligations at experiment ATLAS.

Slovak contribution is well known within the ATLAS community


CERN


Experiment ATLAS


ATLAS cavern


Slovak ATLAS community

All members of Slovak ATLAS group are involved in calorimetry

HEC group ( D. Bruncko)TileCal group (S. Tokár)


HEC activities

Main obligation of Slovak HEC group is the electronic calibration system for HEC

Part of the system was cold test software Other part of the system is calibration within

all beam tests The group is involved at MC simulation

software development as well


HEC cold tests

Within the HEC sub-detector construction, Slovak group was responsible for cold-testing software development

Totally 132 modules were cold-tested No delay was caused due to our software Project was successfully finished at 2003


HEC cold tests


HEC beam test calibration

Software for calibration data acquisition and analysis was developed

Quality check using the calibration data


HEC beam test calibration


Beam tests MC simulation


Geant4 physics validation

Geant4 is still under development therefore authors need a feedback from users

Precise comparison of simulated and experimental beam test data was used to verify hadronic physics at G4 environment


Geant4 physics validation


TileCal activities

Test Beam Data reconstruction PMT Tests using the Single Photoelectron

Analysis Top Quark Physics – determination of the

top quark charge Fast MC simulation of Calorimeter Response


Test Beam Data Reconstruction

Data from Test Beams analysed:

Calorimeter response to pions investigated (linearity, homogeneity, energy resolution)

A method of energy reconstruction using topology of hadronic shower proposed


PMT Tests using Single p.e. Analysis

TileCal PMTs tested using the single ph.e. method elaborated in Bratislava:

• PMT excess factor found (needed to find the energy to signal factor)

• Details of PMT structure seen (1st dynode effect)

A PMT spectrum analysed by the single p.e. method


Top Quark physics

Possibility of the ATLAS exp. to determine the top quark charge (2 approaches)

Via radiative top production ( ) matrix elements implemented into PYTHIA

By the charges of top decay products

Results: The Atlas has a capability to determine the top charge in one LHC year (10 fb-1 sample) for both approaches

, ~ 2toppp t t Q


Fast MC Simulation of the ATLAS Calorimeter

• The fast MC code for TileCal created works 1000 faster than the full simulation

• Works continue to create the fast MC for full Calorimeter

Fast MC vs Test beam data


Conclusions

In addition to electronic calibration now we start to deal with physics calibration. 1-5th Dec. 2004 we organize the workshop concerning this topic

ATLAS software (Athena framework) independent validation


Conclusions

Precise analysis of detector (calorimeter) physics with the aim to improve detector performance.

Focusing to some processes of possible physics

More experienced physicists are expected to come back to Slovakia

Slovak contribution to experiment ATLAS

Documents

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