Performance assumptions for an upgraded ATLAS detector at a High-Luminosity LHC

ATL-PHYS-PUB-2013-004

13 March 2013

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Abstract
This note documents the performance assumptions used for the preparation of the ATLAS inputs to the 2012 European Strategy for Particle Physics. In particular, it lists the parametrization functions describing the object selection efficiencies and resolutions for an upgraded detector observing proton-proton collisions at a High Luminosity LHC.
Figures
Figure 01:
The distribution of irreducible di-photon and reducible gamma-jet and jet-jet backgrounds from MC truth generated events, after smearing photons and fakes with functions parameters described in the text.

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Figure 02a:
Probability for a true 1 prong tau to pass the Loose/medium/tight identification.

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Figure 02b:
Probability for a true multi prong (2 or 3 tracks reconstructed) tau to pass the Loose/medium/tight identification.

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Figure 03:
Noise term obtained from the fits to the resolution as a function of mu shown for |eta|<0.8 in the EM+JES anti-k_t. A linear fit was performed to allow to extrapolate to mu = 140.

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Figure 04:
Mean pile-up jet multiplicity extrapolation as a function of mu for each p_T threshold. The fit is a power law proportional to mu^2.

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Figure 05a:
b-jet tagging efficiency as function of p_T and |eta| in a sample of ttbar events.

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Figure 05b:
c-jet tagging efficiency as function of p_T and |eta| in a sample of ttbar events.

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Figure 05c:
Light-jet tagging efficiency as function of p_T and |eta| in a sample of ttbar events.

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Figure 06a:
Light jet rejection as a function of the b-jet efficiency of IP3D+SV1 for three different sample with mu=0, mu=20, mu=40.

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Figure 06b:
Light jet rejection as a function of mu, normalized to the value at mu=0, of IP3D+SV1 at a b-jet efficiency of 70%.

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2024-03-19 01:28:44