CERN Accelerating science

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: : (a) A schematic depiction of the ITk Layout 03-00-00 as presented in this document. (b) A zoomed-in view of the pixel detector. In each case, only one quadrant and only active detector elements are shown. The horizontal axis is along the beam line with zero being the nominal interaction point. The vertical axis is the radius measured from the interaction point. Thicker lines in the flat barrel sections are due to their tilt in the $\phi$-direction, while thicker lines in the endcap disks are due to their staggering along the $z$-direction, where $z$-positions vary between distinct values as a function of $\phi$ location.

: : (a) A schematic depiction of the ITk Layout 03-00-00 as presented in this document. (b) A zoomed-in view of the pixel detector. In each case, only one quadrant and only active detector elements are shown. The horizontal axis is along the beam line with zero being the nominal interaction point. The vertical axis is the radius measured from the interaction point. Thicker lines in the flat barrel sections are due to their tilt in the $\phi$-direction, while thicker lines in the endcap disks are due to their staggering along the $z$-direction, where $z$-positions vary between distinct values as a function of $\phi$ location.

Transverse view of the Inner Tracker Layout 03-00-00 presented in this document.

Transverse view of the Inner Tracker Layout 03-00-00 presented in this document.

Longitudinal view of the Inner Tracker Layout 03-00-00 presented in this document.

Longitudinal view of the Inner Tracker Layout 03-00-00 presented in this document.

Number of combined potential strip and pixel measurements along a particle trajectory as a function of the truth particle pseudorapidity for the ITk Layout 03-00-00. A sample of single-muon events with $\pT=1~\GeV$ is used. The muons are produced with a uniform distribution between 0~to~2~mm in transverse distance to the beam line and at fixed values of $z =$ -15 cm, 0 cm, and 15 cm, in equal amounts.

Number of combined potential strip and pixel measurements along a particle trajectory as a function of the truth particle pseudorapidity for the ITk Layout 03-00-00. A sample of single-muon events with $\pT=1~\GeV$ is used. The muons are produced with a uniform distribution between 0~to~2~mm in transverse distance to the beam line and at fixed values of $z =$ -15 cm, 0 cm, and 15 cm, in equal amounts.

Integrated radiation length ($\mathrm{X}_0$) traversed by a straight track as a function of the absolute pseudorapidity $|\eta|$ at the exit of the ITk volume for the ITk Layout 03-00-00, broken down by sub-system and material category. The Inner Positioning Tube (IPT) is a support carbon-fibre cylinder just outside the beam pipe. The Patch Panel~1 (PP1) is an interface located in the endcaps that facilitates power distribution, signal transmission, and optical conversion between the detector modules and external systems. The moderator is located beyond the active detector area.

Integrated radiation length ($\mathrm{X}_0$) traversed by a straight track as a function of the absolute pseudorapidity $|\eta|$ at the exit of the ITk volume for the ITk Layout 03-00-00, broken down by sub-system and material category. The Inner Positioning Tube (IPT) is a support carbon-fibre cylinder just outside the beam pipe. The Patch Panel~1 (PP1) is an interface located in the endcaps that facilitates power distribution, signal transmission, and optical conversion between the detector modules and external systems. The moderator is located beyond the active detector area.

Integrated nuclear interaction length ($\Lambda_0$) traversed by a straight track as a function of the absolute pseudorapidity $|\eta|$ at the exit of the ITk volume for the ITk Layout 03-00-00, broken down by sub-system and material category. The Inner Positioning Tube (IPT) is a support carbon-fibre cylinder just outside the beam pipe. The Patch Panel~1 (PP1) is an interface located in the endcaps that facilitates power distribution, signal transmission, and optical conversion between the detector modules and external systems. The moderator is located beyond the active detector area.

Integrated nuclear interaction length ($\Lambda_0$) traversed by a straight track as a function of the absolute pseudorapidity $|\eta|$ at the exit of the ITk volume for the ITk Layout 03-00-00, broken down by sub-system and material category. The Inner Positioning Tube (IPT) is a support carbon-fibre cylinder just outside the beam pipe. The Patch Panel~1 (PP1) is an interface located in the endcaps that facilitates power distribution, signal transmission, and optical conversion between the detector modules and external systems. The moderator is located beyond the active detector area.

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: : Material thickness in (a)~radiation lengths ($X_{0}$) and (b) nuclear interaction lengths ($\Lambda_{0}$) seen by particles until reaching the minimum number of hits required for track reconstruction. The ITk detector is compared with the Run 3 detector.

: : Material thickness in (a)~radiation lengths ($X_{0}$) and (b) nuclear interaction lengths ($\Lambda_{0}$) seen by particles until reaching the minimum number of hits required for track reconstruction. The ITk detector is compared with the Run 3 detector.

Location of the material for one quadrant of the ITk Layout 03-00-00.

Location of the material for one quadrant of the ITk Layout 03-00-00.

Distribution of the mean number of pixel and strip clusters vs $\eta$, at $\langle\mu\rangle=0$ and $\langle\mu\rangle=200$.

Distribution of the mean number of pixel and strip clusters vs $\eta$, at $\langle\mu\rangle=0$ and $\langle\mu\rangle=200$.

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: : Expected physics seeding efficiency as a function of (a) $\eta$ and (b) $\pT$ for $t\bar{t}$ events at $\left\langle\mu\right\rangle$ = 200 for hard-scatter particles with $\pT >1~\GeV$. The seeding efficiency is shown separately for pixel-only, strip-only and both combined.

: : Expected physics seeding efficiency as a function of (a) $\eta$ and (b) $\pT$ for $t\bar{t}$ events at $\left\langle\mu\right\rangle$ = 200 for hard-scatter particles with $\pT >1~\GeV$. The seeding efficiency is shown separately for pixel-only, strip-only and both combined.

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: : Expected technical and physics seeding efficiencies as a function of (a) $\eta$ and (b) $\pT$ for $t\bar{t}$ events at $\left\langle\mu\right\rangle=200$ for hard-scatter particles with $\pT>1~\GeV$. The efficiency is shown for the combined pixel and strip seeding.

: : Expected technical and physics seeding efficiencies as a function of (a) $\eta$ and (b) $\pT$ for $t\bar{t}$ events at $\left\langle\mu\right\rangle=200$ for hard-scatter particles with $\pT>1~\GeV$. The efficiency is shown for the combined pixel and strip seeding.

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: : Expected number of seeds per particle as a function of (a) $\eta$ and (b) $\pT$ for $t\bar{t}$ events at $\left\langle\mu\right\rangle$ = 200 for hard-scatter particles with $\pT>1~\GeV$, shown separately for pixel-only, strip-only and both combined.

: : Expected number of seeds per particle as a function of (a) $\eta$ and (b) $\pT$ for $t\bar{t}$ events at $\left\langle\mu\right\rangle$ = 200 for hard-scatter particles with $\pT>1~\GeV$, shown separately for pixel-only, strip-only and both combined.

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: Expected physics tracking efficiency for single muons with (a) $\pT=2$, (b) 10 and (c) 100~\GeV without \pileup. The results are compared for muons between the ITk and the Run 3 detector. : Caption not extracted

: Expected physics tracking efficiency for single muons with (a) $\pT=2$, (b) 10 and (c) 100~\GeV without \pileup. The results are compared for muons between the ITk and the Run 3 detector. : Caption not extracted

Expected physics tracking efficiency for single muons, electrons and pions with $\pT=10~\GeV$ without \pileup.

Expected physics tracking efficiency for single muons, electrons and pions with $\pT=10~\GeV$ without \pileup.

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: : Expected physics tracking efficiency as a function of (a) $\eta$ and (b) $\pT$ in $t\bar{t}$ events at $\left\langle\mu\right\rangle$ = 200 for hard-scatter particles with $\pT>1~\GeV$ with the ITk detector compared with the Run 3 detector, in conditions with a uniform $\left\langle\mu\right\rangle$ distribution between 0~and~80.

: : Expected physics tracking efficiency as a function of (a) $\eta$ and (b) $\pT$ in $t\bar{t}$ events at $\left\langle\mu\right\rangle$ = 200 for hard-scatter particles with $\pT>1~\GeV$ with the ITk detector compared with the Run 3 detector, in conditions with a uniform $\left\langle\mu\right\rangle$ distribution between 0~and~80.

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: : Comparison between the expected technical and physics tracking efficiencies as a function of (a) $\eta$ and (b)~$\pT$ in $t\bar{t}$ events at $\left\langle\mu\right\rangle=200$ for hard-scatter particles with $\pT>1~\GeV$ with the ITk detector.

: : Comparison between the expected technical and physics tracking efficiencies as a function of (a) $\eta$ and (b)~$\pT$ in $t\bar{t}$ events at $\left\langle\mu\right\rangle=200$ for hard-scatter particles with $\pT>1~\GeV$ with the ITk detector.

Expected physics tracking efficiency as a function of \pileup in $t\bar{t}$ events for hard-scatter particles with $\pT>1~\GeV$ with the ITk detector.

Expected physics tracking efficiency as a function of \pileup in $t\bar{t}$ events for hard-scatter particles with $\pT>1~\GeV$ with the ITk detector.

Expected physics tracking efficiency as a function of \pileup in $t\bar{t}$ events at $\left\langle\mu\right\rangle$ = 200 for hard-scatter particles with $\pT>1~\GeV$ with the ITk detector in different $|\eta|$ ranges.

Expected physics tracking efficiency as a function of \pileup in $t\bar{t}$ events at $\left\langle\mu\right\rangle$ = 200 for hard-scatter particles with $\pT>1~\GeV$ with the ITk detector in different $|\eta|$ ranges.

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: : Physics tracking efficiency for tracks in jets as a function of the jet $p_T$ in $Z'$ events in which the $Z'$ decays hadronically, comparing (a) the inclusive efficiency for all tracks matched to the jet ($\Delta R<0.4$) or within the jet core ($\Delta R < 0.02$) and (b)~reconstruction scenarios with perfect, or no, classification of merged clusters in the jet core.

: : Physics tracking efficiency for tracks in jets as a function of the jet $p_T$ in $Z'$ events in which the $Z'$ decays hadronically, comparing (a) the inclusive efficiency for all tracks matched to the jet ($\Delta R<0.4$) or within the jet core ($\Delta R < 0.02$) and (b)~reconstruction scenarios with perfect, or no, classification of merged clusters in the jet core.

Number of reconstructed tracks per event with $\pT> 1~\GeV$ as a function of the number of interactions for $t\bar{t}$ events at $\left\langle\mu\right\rangle$ = 200 with the ITk detector compared with the Run 3 detector, in conditions with a uniform $\left\langle\mu\right\rangle$ distribution between 0~and~80. The dashed lines illustrate the results of linear fits performed over the limited range corresponding to $\langle\mu\rangle$ between 120 and 280 for the ITk and between 20 and 60 (extrapolated to 0--120) for the Run 3 detector to illustrate the \pileup dependence of this quantity.

Number of reconstructed tracks per event with $\pT> 1~\GeV$ as a function of the number of interactions for $t\bar{t}$ events at $\left\langle\mu\right\rangle$ = 200 with the ITk detector compared with the Run 3 detector, in conditions with a uniform $\left\langle\mu\right\rangle$ distribution between 0~and~80. The dashed lines illustrate the results of linear fits performed over the limited range corresponding to $\langle\mu\rangle$ between 120 and 280 for the ITk and between 20 and 60 (extrapolated to 0--120) for the Run 3 detector to illustrate the \pileup dependence of this quantity.

Fraction of mis-reconstructed tracks, defined as the difference between a quadratic fit in the full $\mu$ range and a linear fit extrapolated from the $\mu < 20$ region. The number of tracks corresponding to real particles and containing enough hits to satisfy the reconstruction criteria is expected to scale linearly with \pileup. The mis-reconstructed track population is composed of fake tracks not corresponding to any particle and tracks corresponding to actual particles but that include mis-attributed hits from \pileup particles, and is expected to increase faster than linearly with \pileup.

Fraction of mis-reconstructed tracks, defined as the difference between a quadratic fit in the full $\mu$ range and a linear fit extrapolated from the $\mu < 20$ region. The number of tracks corresponding to real particles and containing enough hits to satisfy the reconstruction criteria is expected to scale linearly with \pileup. The mis-reconstructed track population is composed of fake tracks not corresponding to any particle and tracks corresponding to actual particles but that include mis-attributed hits from \pileup particles, and is expected to increase faster than linearly with \pileup.

Fraction of all tracks with matching probability less than 50\% as computed in Monte Carlo simulation, which estimates the fraction of tracks not closely corresponding to a charged particle, also known as the fake track creation rate.

Fraction of all tracks with matching probability less than 50\% as computed in Monte Carlo simulation, which estimates the fraction of tracks not closely corresponding to a charged particle, also known as the fake track creation rate.

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: : Transverse impact parameter ($d_0$) resolution as a function of $\eta$ for (a) 2~\GeV and (b) 100~\GeV muons without \pileup, compared between the ITk and the Run 3 detector.

: : Transverse impact parameter ($d_0$) resolution as a function of $\eta$ for (a) 2~\GeV and (b) 100~\GeV muons without \pileup, compared between the ITk and the Run 3 detector.

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: : Longitudinal impact parameter ($z_0$) resolution as a function of $\eta$ for (a) 2~\GeV and (b) 100~\GeV muons without \pileup, compared between the ITk and the Run 3 detector.

: : Longitudinal impact parameter ($z_0$) resolution as a function of $\eta$ for (a) 2~\GeV and (b) 100~\GeV muons without \pileup, compared between the ITk and the Run 3 detector.

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: : Relative transverse momentum resolution as a function of $\eta$ for (a) 2~\GeV and (b) 100~\GeV muons without \pileup, compared between the ITk and the Run 3 detector.

: : Relative transverse momentum resolution as a function of $\eta$ for (a) 2~\GeV and (b) 100~\GeV muons without \pileup, compared between the ITk and the Run 3 detector.

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: : (a) Distribution of the number of local \pileup density around the hard-scatter vertex, evaluated in $t\bar{t}$ events with $\langle\mu\rangle=200$ in the ITk sample and with a uniform \pileup profile between 0~and~80 in the Run 3 sample. (b) Primary vertex reconstruction efficiency evaluated in $t\bar{t}$ events with $\langle\mu\rangle=200$ as a function of the local \pileup density around the hard-scatter vertex. For comparison, the performance obtained with the Run 3 ATLAS detector with a uniform \pileup profile between 0 and 80 is also shown.

: : (a) Distribution of the number of local \pileup density around the hard-scatter vertex, evaluated in $t\bar{t}$ events with $\langle\mu\rangle=200$ in the ITk sample and with a uniform \pileup profile between 0~and~80 in the Run 3 sample. (b) Primary vertex reconstruction efficiency evaluated in $t\bar{t}$ events with $\langle\mu\rangle=200$ as a function of the local \pileup density around the hard-scatter vertex. For comparison, the performance obtained with the Run 3 ATLAS detector with a uniform \pileup profile between 0 and 80 is also shown.

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: : Primary vertex combined reconstruction and selection efficiency evaluated in $t\bar{t}$ events with$\langle\mu\rangle=200$. The efficiency is presented as a function of (a) the local \pileup density around the hard-scatter vertex and (b) the number of interactions. For comparison, the performance obtained with the Run 3 ATLAS detector with a uniform \pileup profile between 0~and~80 is also shown.

: : Primary vertex combined reconstruction and selection efficiency evaluated in $t\bar{t}$ events with$\langle\mu\rangle=200$. The efficiency is presented as a function of (a) the local \pileup density around the hard-scatter vertex and (b) the number of interactions. For comparison, the performance obtained with the Run 3 ATLAS detector with a uniform \pileup profile between 0~and~80 is also shown.

Longitudinal position resolution of the reconstructed primary vertex, evaluated in $t\bar{t}$ events with $\langle\mu\rangle=200$. For comparison, the performance obtained with the Run 3 ATLAS detector with a uniform \pileup profile between 0~and~80 is also shown.

Longitudinal position resolution of the reconstructed primary vertex, evaluated in $t\bar{t}$ events with $\langle\mu\rangle=200$. For comparison, the performance obtained with the Run 3 ATLAS detector with a uniform \pileup profile between 0~and~80 is also shown.