Resolutions of ATLAS Detectors

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SUMMARY

The discussion focuses on the resolutions of ATLAS detector components, specifically the momentum resolution for the Inner Detector and energy resolution for the CAL systems. The user references the formula for the Inner Detector momentum resolution, \(\sigma_{1/p_T} = 0.34 \text{TeV}^{-1} \Big(1 \oplus \frac{44 \text{GeV}}{p_T} \Big)\), noting it is based on Run1 data prior to the installation of the B-Layer. For the ECAL, the energy resolution is described by \(\frac{\sigma_E}{E(\text{GeV})} = \frac{a}{\sqrt{E(\text{GeV})}} \oplus b\), with design and experimental parameters provided. The user seeks updated references to confirm if these resolutions have changed post-B-Layer installation.

PREREQUISITES
  • Understanding of ATLAS detector components and their functions
  • Familiarity with momentum and energy resolution formulas
  • Knowledge of quadrature addition in statistical analysis
  • Basic grasp of particle physics terminology and concepts
NEXT STEPS
  • Research recent publications from ATLAS on detector performance updates
  • Explore the impact of the B-Layer installation on momentum resolution
  • Investigate the latest energy resolution measurements for the ECAL
  • Learn about the statistical methods used in analyzing detector resolutions
USEFUL FOR

Particle physicists, researchers involved in the ATLAS experiment, and anyone interested in the performance metrics of high-energy physics detectors.

ChrisVer
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Hi,
I was looking for ATLAS detector parts resolutions (momentum for Inner Detector and Energy for the CAL systems).
Does anyone have a nice reference?
So far I found something like this for the ID:
\sigma_{1/p_T} = 0.34 \text{TeV}^{-1} \Big(1 \oplus \frac{44 \text{GeV}}{p_T} \Big)
With ##\oplus## meaning that the two terms are added in quadrature and then the square root is taken.
However this formula was from Run1 and before the installation of the B-Layer.
Has the last altered this expression?

Similarily for the ECAL:
\frac{\sigma_E}{E(\text{GeV})} = \frac{a}{\sqrt{E(\text{GeV})}} \oplus b
a_{\text{design}}=10 \%
b_{\text{design}}=0.7 \%
or from tests on e, μ and pions:
a_{\text{exper}}=10.7 \%
b_{\text{exper}}=0.5 \%
(http://iopscience.iop.org/article/10.1088/1748-0221/3/08/S08003/meta)

Do you know if they have changed (ref)?
I don't think that the dependencies will be changed (1/p or sqrt(1/E) ) but the numbers in front probably have.

Thanks.
 
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ChrisVer said:
Does anyone have a nice reference?
You can simply go through the list of things ATLAS published, e. g. this page for the performance of the inner detector tracking. Found with google: "atlas inner detector momentum resolution".
 

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