Resolutions of ATLAS Detectors

In summary, the ATLAS detector has published information on the performance of its inner detector tracking, including a formula for the momentum resolution and information on changes made after Run 1 and the installation of the B-Layer. They have also published information on the performance of the ECAL, including a formula and experimental values for the energy resolution. It is recommended to search for this information on ATLAS's website.
  • #1
ChrisVer
Gold Member
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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:
[itex] \sigma_{1/p_T} = 0.34 \text{TeV}^{-1} \Big(1 \oplus \frac{44 \text{GeV}}{p_T} \Big) [/itex]
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:
[itex] \frac{\sigma_E}{E(\text{GeV})} = \frac{a}{\sqrt{E(\text{GeV})}} \oplus b[/itex]
[itex]a_{\text{design}}=10 \%[/itex]
[itex]b_{\text{design}}=0.7 \%[/itex]
or from tests on e, μ and pions:
[itex]a_{\text{exper}}=10.7 \%[/itex]
[itex]b_{\text{exper}}=0.5 \%[/itex]
(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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  • #2
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".
 

1. What is the purpose of ATLAS detectors?

The ATLAS (A Toroidal LHC Apparatus) detectors are designed to study the collisions of particles produced by the Large Hadron Collider (LHC) at CERN. They aim to observe and measure the properties of subatomic particles, such as protons and neutrons, in order to better understand the fundamental forces and building blocks of the universe.

2. How do ATLAS detectors work?

The ATLAS detectors are made up of different layers of specialized equipment, including tracking detectors, calorimeters, and muon chambers. When particles from a collision pass through these layers, they leave behind traces of energy that can be measured and analyzed to determine their type and properties.

3. What is the resolution of ATLAS detectors?

The resolution of ATLAS detectors refers to their ability to accurately measure the properties of particles. This is determined by the precision of the equipment used and is typically expressed as a percentage of the particle's energy or momentum. The resolution of ATLAS detectors can vary depending on the type of particle being measured and the specific detector being used.

4. What are some challenges faced in maintaining and operating ATLAS detectors?

The ATLAS detectors are extremely complex and delicate pieces of equipment, requiring constant maintenance and careful calibration to ensure accurate measurements. Additionally, the high-energy collisions at the LHC can cause damage to the detectors, requiring regular repairs and upgrades. The vast amount of data produced by the detectors also poses challenges in data storage and analysis.

5. How have ATLAS detectors advanced our understanding of particle physics?

The ATLAS detectors have played a crucial role in the discovery of the Higgs boson, a fundamental particle that gives mass to other particles. They have also provided evidence for the existence of other particles, such as the top quark and W and Z bosons. These discoveries have helped to confirm and refine our understanding of the Standard Model of particle physics and have opened up new avenues for research and exploration of the universe.

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