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Public Inner Detector Plots for Collision Data

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Results from first collisions on 23 November 2009

Shift in z0 of tracks as a result of RF cogging.
This plot was made from the best quality collision candidates recorded by ATLAS on 23 November, and selecting tracks with at least 6 SCT hits, more than 10 TRT hits and |d0|<10mm (distance of closest approach to the nominal beam line). The distribution in red is for luminosity blocks LB<140 (before RF adjustment) and in blue for LB>145 (after RF adjustment). The shift in z0 is consistent with the 12cm expected from beam pick up measurements of the arrival times of the beams (cf. the beam pickup system plots).
TrackZposition_140541_f175_silverEvents_newLabels_largerBins.png
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Scatter plot of hits on tracks in the first collision events. TRT hits are shown in blue, and SCT hits in red. The pixel detector was not switched on, and the SCT was running at reduced voltage. The solenoid magnetic field was zero, so tracks are straight. HitScatter23Nov.png
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Distribution of impact parameter, d0, of tracks in first collision events. d023Nov.png
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First results with stable beams at 900 GeV

Scatter plot of hits on barrel tracks in the first collision events with stable beams. TRT hits are shown in blue, SCT in red, and Pixel in green. The solenoid is at full field, and the curved tracks can clearly be seen in the TRT. InDetScatterPlot-141811-noframe.png
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Unbiased x residual distribution, integrated over all hits-on-tracks in the pixel barrel. The x residual is defined as the measured hit position minus the expected hit position from the track extrapolation, projected onto the local x coordinate (the precision coordinate). The distribution is shown for the 900 GeV collisions run 141749, compared with a minimum bias Monte Carlo simulation sample reconstructed with perfect ID alignment. The distributions are normalised to equal area. A track selection requiring pT>2.0 GeV, |d0| < 10mm, N(Pix+SCT)Hits>=6 and nTRTHits>=15 is applied. This result is achieved using the alignment constants calculated from cosmic ray samples. PIXX.png
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Unbiased x residual distribution, integrated over all hits-on-tracks in the SCT barrel. The x residual is defined as the measured hit position minus the expected hit position from the track extrapolation, projected onto the local x coordinate (the precision coordinate). The distribution is shown for the 900 GeV collisions run 141749, compared with a minimum bias Monte Carlo simulation sample reconstructed with perfect ID alignment. The distributions are normalised to equal area. A track selection requiring pT>2.0 GeV, |d0| < 10mm, N(Pix+SCT)Hits>=6 and nTRTHits>=15 is applied. This result is achieved using the alignment constants calculated from cosmic ray samples. SCTX.png
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X and Z distribution of position of primary vertices for the run 142165. The pt cut for incoming tracks is lowered to 100 MeV. Tracks contributing less than chi2 value of 15 (per two degrees of freedom) to the reconstructed vertex are accepted to the fit. display_142165_lg.gif
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X and Y distribution of position of primary vertices for the run 142165. The pt cut for incoming tracks is lowered to 100 MeV. Tracks contributing less than chi2 value of 15 (per two degrees of freedom) to the reconstructed vertex are accepted to the fit. display_142165_tr.gif
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X distribution of position of primary vertices for the run 142165. The pt cut for incoming tracks is lowered to 100 MeV. Tracks contributing less than chi2 value of 15 (per two degrees of freedom) to the reconstructed vertex are accepted to the fit. display_142165_x.gif
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Y distribution of position of primary vertices for the run 142165. The pt cut for incoming tracks is lowered to 100 MeV. Tracks contributing less than chi2 value of 15 (per two degrees of freedom) to the reconstructed vertex are accepted to the fit. display_142165_y.gif
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Z distribution of position of primary vertices for the run 142165. The pt cut for incoming tracks is lowered to 100 MeV. Tracks contributing less than chi2 value of 15 (per two degrees of freedom) to the reconstructed vertex are accepted to the fit. display_142165_z.gif
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The beam spot is determined from an unbinned maximum-likelihood (ML) fit to the distribution of selected primary vertices. The fit makes use of the estimated error on the position of each reconstructed vertex, allowing for a constant error scale factor. The fit can extract both the position and the size of the beam spot.
This series of six plots show the beam spot position during a run, as a function of time, where time is measured in Luminosity Blocks (each lasting approximately two minutes).

Beam spot stability - x position vs Luminosity Block

data09_900GeV.00141749.physics_MinBias-VTX.n4-LR2-nt.root.x.png
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Beam spot stability - y position vs Lumi Block data09_900GeV.00141749.physics_MinBias-VTX.n4-LR2-nt.root.y.png
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Beam spot stability - z position vs Lumi Block data09_900GeV.00141749.physics_MinBias-VTX.n4-LR2-nt.root.z.png
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Beam spot stability - x width vs Lumi Block data09_900GeV.00141749.physics_MinBias-VTX.n4-LR2-nt.root.sigx.png
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Beam spot stability - y width vs Lumi Block data09_900GeV.00141749.physics_MinBias-VTX.n4-LR2-nt.root.sigy.png
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Beam spot stability - z width vs Lumi Block data09_900GeV.00141749.physics_MinBias-VTX.n4-LR2-nt.root.sigz.png
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First alignment update with collision data

During 2008 and 2009, a large sample of cosmic ray tracks was used to align the Inner Detector. Since these tracks tend to be vertical, they are much more useful for aligning the barrel than the end caps. After only a few days of collision data, the quality of the end cap alignment was dramatically improved, as shown in the following plots, where the position and orientation of end cap disks is updated. The most notable change is an improvement in the alignment residuals for SCT end cap C. The distributions are normalised to equal area. A track selection requiring pT>2.0 GeV, |d0| < 10mm and N(Pix+SCT)Hits>=6 is applied.

SCT barrel local x residuals for a minimum bias Monte Carlo sample with perfect alignment (solid blue), collision data using the alignment based on cosmic rays (open black squares) and after a first update using collision data (open red circles). A double Gaus fit is performed but only the mean and sigma of the narrower Gaussian are shown.

Approved_SCTBarResX.png
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SCT end-cap A local x residuals for a minimum bias Monte Carlo sample with perfect alignment (solid blue), collision data using the alignment based on cosmic rays (open black squares) and after a first update using collision data (open red circles). A single Gaussian fit is performed. Approved_SCTECAResX.png
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SCT end-cap C local x residuals for a minimum bias Monte Carlo sample with perfect alignment (solid blue), collision data using the alignment based on cosmic rays (open black squares) and after a first update using collision data (open red circles). A single Gaussian fit is performed. Approved_SCTECCResX.png
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Pixel barrel local x residuals for a minimum bias Monte Carlo sample with perfect alignment (solid blue), collision data using the alignment based on cosmic rays (open black squares) and after a first update using collision data (open red circles). A double Gaus fit is performed but only the mean and sigma of the narrower Gaussian are shown. Approved_PixBarResX.png
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Pixel end-cap A local x residuals for a minimum bias Monte Carlo sample with perfect alignment (solid blue), collision data using the alignment based on cosmic rays (open black squares) and after a first update using collision data (open red circles). A single Gaussian fit is performed. Approved_PixECAResX.png
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Pixel end-cap C local x residuals for a minimum bias Monte Carlo sample with perfect alignment (solid blue), collision data using the alignment based on cosmic rays (open black squares) and after a first update using collision data (open red circles). A single Gaussian fit is performed. Approved_PixECCResX.png
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Refined alignment with December 2009 collision data

The ID alignment has been further improved by using the whole collision data taken in 2009. The validation plots below show the performance of the alignment which is used for the Feb10 reprocessing, using the following alignment tags:

Unbiased residual distribution in x, integrated over all hits-on-tracks in the pixel barrel for the MC perfect alignment (red) and the current alignment with collision data taken in 2009 (blue). The residual is defined as the measured hit position minus the expected hit position from the track extrapolation. Shown is the projection onto the local x coordinate, which is the precision coordinate. Tracks are selected to have pT > 2 GeV, |d0|<10mm and ≥ 6 silicon hits. The mean and FWHM/2.35 are quoted.

PIXX_Apr2010.png
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Unbiased residual distribution in x, integrated over all hits-on-tracks in the pixel ECs for the MC perfect alignment (red) and the current alignment with collision data taken in 2009 (blue). The residual is defined as the measured hit position minus the expected hit position from the track extrapolation. Shown is the projection onto the local x coordinate, which is the precision coordinate. Tracks are selected to have pT > 2 GeV, |d0|<10mm and ≥ 6 silicon hits. The mean and FWHM/2.35 are quoted.

PIXECX_Apr2010.png
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Unbiased residual distribution in x, integrated over all hits-on-tracks in the SCT barrel for the MC perfect alignment (red) and the current alignment with collision data taken in 2009 (blue). The residual is defined as the measured hit position minus the expected hit position from the track extrapolation. Shown is the projection onto the local x coordinate, which is the precision coordinate. Tracks are selected to have pT > 2 GeV, |d0|<10mm and ≥ 6 silicon hits. The mean and FWHM/2.35 are quoted.

SCTX_Apr2010.png
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Unbiased residual distribution in x, integrated over all hits-on-tracks in the SCT ECs for the MC perfect alignment (red) and the current alignment with collision data taken in 2009 (blue). The residual is defined as the measured hit position minus the expected hit position from the track extrapolation. Shown is the projection onto the local x coordinate, which is the precision coordinate. Tracks are selected to have pT > 2 GeV, |d0|<10mm and ≥ 6 silicon hits. The mean and FWHM/2.35 are quoted.

SCTECX_Apr2010.png
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2010 Beam Spot results at 7 TeV

Two dimensional distribution in the x-z plane of primary vertices with at least 10 tracks per vertex for run 152166 at √s = 7 TeV. One can recognize a small tilt of the luminous region of 471μrad 15μrad. With the small beam spot expected at √s = 7 TeV, the width of the transverse distribution of primary vertices is dominated by the vertexing resolution of about 75μm for the selection used for this figure. First results from beam spot fits indicate a luminous size σ(x) of about 45μm with an error that is completely dominated by systematics.

data10_7TeV.00152166.express_express-DB_BEAMSPOT.f236_c103.MergeNt-nt-xz10.gif
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Two dimensional distribution in the y-z plane of primary vertices with at least 10 tracks per vertex for run 152166 at √s = 7 TeV. With the small beam spot expected at √s = 7 TeV, the width of the transverse distribution of primary vertices is dominated by the vertexing resolution of about 75μm for the selection used for this figure. First results from beam spot fits indicate a luminous size σ(y) of about 70μm with an error that is completely dominated by systematics.

data10_7TeV.00152166.express_express-DB_BEAMSPOT.f236_c103.MergeNt-nt-yz10.gif
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Two dimensional distribution in the transverse plane of primary vertices with at least 10 tracks per vertex for run 152166 at √s = 7 TeV. With the small beam spot expected at √s = 7 TeV, the width of the transverse distribution of primary vertices is dominated by the vertexing resolution of about 75μm for the selection used for this figure. First results from beam spot fits indicate a luminous size of about 45μm in x and 70μm in y with errors that are completely dominated by systematics.

data10_7TeV.00152166.express_express-DB_BEAMSPOT.f236_c103.MergeNt-nt-yx10.gif
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Luminous centroid position in x over the course of run 152166 (LHC Fill 1005) at √s = 7 TeV. The data points shown are the results from fits to samples of 10 minutes of data. Errors are statistical only.

152166-x.gif
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Luminous centroid position in y over the course of run 152166 (LHC Fill 1005) at √s = 7 TeV. The data points shown are the results from fits to samples of 10 minutes of data. Errors are statistical only.

152166-y.gif
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Luminous centroid position in z over the course of run 152166 (LHC Fill 1005) at √s = 7 TeV. The data points shown are the results from fits to samples of 10 minutes of data. Errors are statistical only.

152166-z.gif
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Luminous size in z over the course of run 152166 (LHC Fill 1005) at √s = 7 TeV. The data points shown are the results from fits to samples of 10 minutes of data. Errors are statistical only.

152166-sigz.gif
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Beam Spot Results from December 2009

Two dimensional distribution in the x-z plane of primary vertices with at least 4 tracks per vertex for run 142193 at √s = 900GeV. These are the primary vertices used as input to the beam spot maximum likelihood fit. The luminous region parameters extracted using primary vertices with at least 4 tracks per vertex are in excellent agreement with the parameters obtained when requiring at least 10 tracks per vertex (see below). The errors shown for the beam spot fit results are statistical only. data09_900GeV.00142193.physics_MinBias-VTX-LR5.DPD.r988.v2.2-nt-xz.gif
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Two dimensional distribution in the y-z plane of primary vertices with at least 4 tracks per vertex for run 142193 at √s = 900GeV. These are the primary vertices used as input to the beam spot maximum likelihood fit. The luminous region parameters extracted using primary vertices with at least 4 tracks per vertex are in excellent agreement with the parameters obtained when requiring at least 10 tracks per vertex (see below). The errors shown for the beam spot fit results are statistical only. data09_900GeV.00142193.physics_MinBias-VTX-LR5.DPD.r988.v2.2-nt-yz.gif
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Two dimensional distribution in the x-z plane of primary vertices with at least 10 tracks per vertex for run 142193 at √s = 900GeV. Compared to the figure above, the increased number of tracks per vertex improves the primary vertex resolution to about 100μm, so that the RMS width of the transverse distribution is dominated by the luminous size. The transverse luminous size extracted from the maximum likelihood fit is σ(x) = 200μm 1μm, the longitudinal size is σ(z) = 41.3mm 0.1mm. The errors shown for the beam spot fit results are statistical only. data09_900GeV.00142193.physics_MinBias-VTX-LR5.DPD.r988.v2.2-nt-xz10.gif
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Two dimensional distribution in the y-z plane of primary vertices with at least 10 tracks per vertex for run 142193 at√ s = 900GeV. Compared to the figure above, the increased number of tracks per vertex improves the primary vertex resolution to about 100μm, so that the RMS width of the transverse distribution is dominated by the luminous size. The transverse luminous size extracted from the maximum likelihood fit is σ(y) = 279μm 1μm, the longitudinal size is σ(z) = 41.3mm 0.1mm. The errors shown for the beam spot fit results are statistical only. data09_900GeV.00142193.physics_MinBias-VTX-LR5.DPD.r988.v2.2-nt-yz10.gif
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Two dimensional distribution in the y-x plane of primary vertices with at least 10 tracks per vertex for run 142193 at √s = 900GeV. With the requirement of 10 tracks per vertex, the primary vertex resolution of about 100μm is sufficiently small so that the RMS widths are dominated by the luminous size. The transverse luminous sizes extracted from the maximum likelihood fit are σ(x) = 200μm 1μm and σ(y) = 279μm 1μm . Both the RMS widths of the transverse primary vertex distributions and the extracted transverse luminous sizes show that the average luminous size σ(y) is about 40% larger than σ(x). The errors shown for the beam spot fit results are statistical only. data09_900GeV.00142193.physics_MinBias-VTX-LR5.DPD.r988.v2.2-nt-yx10.gif
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Luminous centroid position in x over the course of run 142193 (LHC fill 911). Both the results from fits to samples of 10 minutes of data (points) and the result from the overall fit (line with error band) are shown. Errors are statistical only. 142193-x.gif
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Luminous centroid position in y over the course of run 142193 (LHC fill 911). Both the results from fits to samples of 10 minutes of data (points) and the result from the overall fit (line with error band) are shown. Errors are statistical only. 142193-y.gif
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Luminous centroid position in z over the course of run 142193 (LHC fill 911). Both the results from fits to samples of 10 minutes of data (points) and the result from the overall fit (line with error band) are shown. Errors are statistical only. 142193-z.gif
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Luminous size σ(x) over the course of run 142193 (LHC fill 911). The data points shown are the results from fits to samples of 10 minutes of data. During the time period shown the luminous size σ(x) decreased by about 20%. Errors are statistical only. 142193-sigx.gif
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Luminous size σ(y) over the course of run 142193 (LHC fill 911). The data points shown are the results from fits to samples of 10 minutes of data. During the time period shown the luminous size σ(y) increased by about 20%. Errors are statistical only. 142193-sigy.gif
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Luminous size σ(z) over the course of run 142193 (LHC fill 911). The data points shown are the results from fits to samples of 10 minutes of data. Errors are statistical only. 142193-sigz.gif
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Two dimensional distribution in the x-z plane of primary vertices with at least 10 tracks per vertex for run 142308 at √s = 2.36TeV. Taking into account the degradation of the primary vertex resolution to about 135μm due to the SCT being off, one finds from the RMS width a slightly smaller luminous size σ(x) than at 900 GeV. The reduction in transverse width is much smaller than for σ(y). The longitudinal luminous size is also smaller than at 900 GeV. The transverse luminous size extracted from the maximum likelihood fit is σ(x) = 180μm 5μm, the longitudinal size is σ(z) = 27.0mm 0.4mm. (Taking the average luminous size from both runs taken at √s = 2.36TeV one finds very similar average transverse luminous sizes in x and y: σ(x) = 165μm 4μm and σ(y) = 163μm 4μm). The errors shown for the beam spot fit results are statistical only. data09_2TeV.00142308.physics_MinBias-VTX-LR5.DPD.r988.v4.2-nt-xz10.gif
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Two dimensional distribution in the y-z plane of primary vertices with at least 10 tracks per vertex for run 142308 at √s = 2.36TeV. In spite of the degradation of the primary vertex resolution to about 135μm due to the SCT being off, one can clearly see the smaller RMS width of the transverse primary vertex distribution that is expected at the higher energy. The longitudinal luminous size is also smaller than at 900 GeV. The transverse luminous size extracted from the maximum likelihood fit is σ(y) = 143μm 5μm, the longitudinal size is σ(z) = 27.0mm 0.4mm. The errors shown for the beam spot fit results are statistical only. data09_2TeV.00142308.physics_MinBias-VTX-LR5.DPD.r988.v4.2-nt-yz10.gif
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Luminous size σ(x) over the course of run 142308 (LHC fill 916) at √s = 2.36TeV. Both the results from fits to samples of 10 minutes of data (points) and the result from the overall fit (line with error band) are shown. Errors are statistical only. 142308-sigx.gif
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Luminous size σ(y) over the course of run 142308 (LHC fill 916) at √s = 2.36TeV. Both the results from fits to samples of 10 minutes of data (points) and the result from the overall fit (line with error band) are shown. Errors are statistical only. 142308-sigy.gif
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Luminous size σ(z) over the course of run 142308 (LHC fill 916) at√ s = 2.36TeV. Both the results from fits to samples of 10 minutes of data (points) and the result from the overall fit (line with error band) are shown. Errors are statistical only. 142308-sigz.gif
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Evolution of the luminous size in x over several runs at √s = 900GeV from December 10 to December 12. Errors are statistical only. beamspothistory-sigx.gif
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Evolution of the luminous size in y over several runs at √s = 900GeV from December 10 to December 12. Errors are statistical only. beamspothistory-sigy.gif
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Evolution of the luminous size in z over several runs at √s = 900GeV from December 10 to December 12. Errors are statistical only. beamspothistory-sigz.gif
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Alignment Performance with 2010 7 TeV Collisions data

The validation plots below show the performance of the alignment which was used for the May 2010 reprocessing. This alignment was derived using the Global X2 algorithm using the 2009 900 GeV collisions dataset, and corresponds to the following alignment tags:

Unbiased residual distribution in x, integrated over all hits-on-tracks in the pixel barrel for the MC perfect alignment (red) and the current alignment with sqrt(s)=7 TeV collision data (run 153565) taken in 2010 (blue). The MC distributions are normalised to the number of entries in the data distributions. The residual is defined as the measured hit position minus the expected hit position from the track extrapolation. Shown is the projection onto the local x coordinate, which is the precision coordinate. Tracks are selected to have pT > 2 GeV and ≥ 6 silicon hits. The FWHM/2.35 of the distributions are quoted. PIXX_May2010Alignment.png
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Unbiased residual distribution in x, integrated over all hits-on-tracks in the pixel endcaps (both endcaps A and C) for the MC perfect alignment (red) and the current alignment with sqrt(s)=7 TeV collision data (run 153565) taken in 2010 (blue). The MC distributions are normalised to the number of entries in the data distributions. The residual is defined as the measured hit position minus the expected hit position from the track extrapolation. Shown is the projection onto the local x coordinate, which is the precision coordinate. Tracks are selected to have pT > 2 GeV and ≥ 6 silicon hits. The FWHM/2.35 of the distributions are quoted. PIXECX_May2010Alignment.png
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Unbiased residual distribution in x, integrated over all hits-on-tracks in the SCT barrel for the MC perfect alignment (red) and the current alignment with sqrt(s)=7 TeV collision data (run 153565) taken in 2010 (blue). The MC distributions are normalised to the number of entries in the data distributions. The residual is defined as the measured hit position minus the expected hit position from the track extrapolation. Shown is the projection onto the local x coordinate, which is the precision coordinate. Tracks are selected to have pT > 2 GeV and ≥ 6 silicon hits. The FWHM/2.35 of the distributions are quoted. SCTX_May2010Alignment.png
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Unbiased residual distribution in x, integrated over all hits-on-tracks in the SCT endcaps (both endcaps A and C) for the MC perfect alignment (red) and the current alignment with sqrt(s)=7 TeV collision data (run 153565) taken in 2010 (blue). The MC distributions are normalised to the number of entries in the data distributions. The residual is defined as the measured hit position minus the expected hit position from the track extrapolation. Shown is the projection onto the local x coordinate, which is the precision coordinate. Tracks are selected to have pT > 2 GeV and ≥ 6 silicon hits. The FWHM/2.35 of the distributions are quoted. SCTECX_May2010Alignment.png
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The TRT unbiased residuals, as obtained from 7 TeV collision data (run 153565) and Monte Carlo, separately for the barrel and end-caps. The Monte Carlo distributions are normalized to the number of entries in the data. Tracks are required to have: pT > 2 GeV and >= 6 silicon hits. The Full-Width-Half-Maximum reported in the plots (FWHM/2.35) is comparable to the sigma of a single Gaussian fit. A single Gaussian fit (iterated until the range corresponds to +/- 1.5*sigma) gives 144 microns (144 microns) and 165 microns (136 microns) for barrel and end-cap data (MC), respectively. For these low-momentum tracks, the width of the residual distribution is larger than the intrinsic accuracy per hit expected from the drift-time measurement because of the contribution from multiple scattering to the track parameter errors. The measured resolution in the end-caps is worse than in the barrel and than that expected from the Monte Carlo. Unlike the barrel, the TRT end-cap geometry did not allow for detailed studies with cosmic rays, further commissioning of the TRT end-caps is required to achieve performance similar to that of the barrel. TRTR_May2010Alignment.png
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TRTECR_May2010Alignment.png
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Alignment Performance with 2010 7 TeV Collisions data and October 2010 alignment (Autumn reprocessing constants)

The validation plots below show the performance of the alignment which was used for the Autumn 2010 reprocessing. This alignment was derived using the Global X2 algorithm using the 2010 7 TeV GeV collisions dataset, and corresponds to the following alignment tags
  • Silicon constants: InDetAlign_Collision_7T_2010_07
  • TRT alignment constants: TRTAlign_Collision_7T_2010_07
  • TRT L3 alignment constants: TRTCalibDX_L3BarrelEndcap_01
  • Error scaling: TrkErrorScaling_7T_2010_03
  • All this tags are collected in: COMCOND-REPPxx-007-05 family
Distribution of the local x unbiased residuals of the pixel barrel modules. Plot produced with tracks (pT> 2 GeV) reconstructed in LHC Minimum Bias events at center of mass energy 7 TeV. Full blue circles show the real data residuals after the detector alignment, and the open red circles show the residuals using MC with a perfectly aligned detector (normalized to the number of entries in the data distribution). The local x coordinate of the pixels is along the most precise pixel direction. PIXX_Oct2010Alignment.png
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Distribution of the local y unbiased residuals of the pixel barrel modules. Plot produced with tracks (pT> 2 GeV) reconstructed in LHC Minimum Bias events at center of mass energy 7 TeV. Full blue circles show the real data residuals after the detector alignment, and the open red circles show the residuals using MC with a perfectly aligned detector (normalized to the number of entries in the data distribution). The local y coordinate of the pixels is along the broad pixel direction. PIXY_Oct2010Alignment.png
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Distribution of the local x unbiased residuals of the pixel end-cap modules. Plot produced with tracks (pT> 2 GeV) reconstructed in LHC Minimum Bias events at center of mass energy 7 TeV. Full blue circles show the real data residuals after the detector alignment, and the open red circles show the residuals using MC with a perfectly aligned detector (normalized to the number of entries in the data distribution).The local x coordinate of the pixels is along the most precise pixel direction. PIXECX_Oct2010Alignment.png
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Distribution of the local y unbiased residuals of the pixel end-cap modules. Plot produced with tracks (pT> 2 GeV) reconstructed in LHC Minimum Bias events at center of mass energy 7 TeV. Full blue circles show the real data residuals after the detector alignment, and the open red circles show the residuals using MC with a perfectly aligned detector (normalized to the number of entries in the data distribution).The local y coordinate of the pixels is along the broad pixel direction. PIXECY_Oct2010Alignment.png
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Distribution of the local x unbiased residuals of the SCT barrel modules. Plot produced with tracks (pT> 2 GeV) reconstructed in LHC Minimum Bias events at center of mass energy 7 TeV. Full blue circles show the real data residuals after the detector alignment, and the open red circles show the residuals using MC with a perfectly aligned detector (normalized to the number of entries in the data distribution). The local x coordinate of the SCT is across the micro-strip direction. SCTX_Oct2010Alignment.png
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Distribution of the local x unbiased residuals of the SCT end-cap modules. Plot produced with tracks (pT> 2 GeV) reconstructed in LHC Minimum Bias events at center of mass energy 7 TeV. Full blue circles show the real data residuals after the detector alignment, and the open red circles show the residuals using MC with a perfectly aligned detector (normalized to the number of entries in the data distribution). The local x coordinate of the SCT is across the micro-strip direction. SCTECX_Oct2010Alignment.png
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The TRT unbiased residuals, as obtained from 7 TeV LHC collision data after detector alignment and Monte Carlo (perfectly aligned detector), separately for the barrel and end-caps. The Monte Carlo distributions (open red circles) are normalized to the number of entries in the data (full blue circles). Tracks are required to have pT> 2 GeV. For low-momentum tracks, the width of the residual distribution is expected to be larger than the intrinsic accuracy per hit as predicted from the drifttime measurement because of the contribution from multiple scattering. TRTR_Oct2010Alignment.png
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TRTECR_Oct2010Alignment.png
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Residual maps for the TRT innermost barrel layer using the May 2010 alignment (left) and October 2010 alignment (right). The mean residual is plotted as a function of the global z and ϕ sector position of the reconstructed hit. The z axis is parallel to the straw direction. Coherent misalignments corresponding to barrel module deformations, are uncorrected in the May 2010 and give rise to structure in the mean residual vs z. These misalignments are removed by the wire-by-wire alignment in the October 2010 alignment constants, where the average residuals are centered around zero with no evidence of variation of along the straw. TRT_barrel_ResMaps_May10.png
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TRT_barrel_ResMaps_Oct10.png
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TRT end-cap A residual maps for May 2010 alignment (left) and October 2010 alignment (right). The mean residual is plotted as a function of the TRT end-cap wheel number (increasing with increasing global |z|) and ϕ sector position of the reconstructed hit. Coherent misalignments corresponding to end-cap 4-plane wheel deformations, are uncorrected in the May 2010 and give rise to structure in the mean residual vs Phi. These misalignments are removed by the wire-by-wire alignment in the October 2010 alignment constants, where the average residuals are centered around zero with no evidence of variation of along the ϕ sectors. TRT_ECA_ResMaps_PhiZ_May10.png
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TRT_ECA_ResMaps_PhiZ_Oct10.png
eps version of the Oct10 residual maps figure
TRT end-cap A residual maps for May 2010 alignment (left) and October 2010 alignment (right). The mean residual is plotted as a function of the TRT end-cap wheel number (increasing with increasing global |z|) and the radius of the reconstructed hit. In this view, the straws are radial. Coherent misalignments corresponding to end-cap 4-plane wheel deformations, are uncorrected in the May 2010 and give rise to structure in the mean residual vs position along the straw. The observed alternating pattern is a result of the back-to-back mechanical assembly of the TRT end-cap wheels. These misalignments are removed by the wire-by-wire alignment in the October 2010 alignment constants, where the average residuals are centered around zero with no evidence of variation of along the straw. TRT_ECA_ResMap_RZ_May10.png
eps version of the May10 residual maps figure
TRT_ECA_ResMap_RZ_Oct10.png
eps version of the Oct10 residual maps figure


Responsible: PippaWells
Last reviewed by: Never reviewed

Topic attachments
I Attachment History Action Size Date Who Comment
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Unknown file formateps PIXECX_May2010Alignment.eps r1 manage 14.7 K 2010-06-02 - 15:01 UnknownUser Pixel Endcaps X residual for May2010 alignment update
PNGpng PIXECX_May2010Alignment.png r1 manage 21.3 K 2010-06-02 - 15:02 UnknownUser Pixel Endcaps X residual for May2010 alignment update
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Unknown file formateps PIXX_Apr2010.eps r1 manage 16.2 K 2010-04-22 - 12:33 PippaWells Updated to FWHM/2.35
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Unknown file formateps PIXX_May2010Alignment.eps r1 manage 14.5 K 2010-06-02 - 12:59 UnknownUser Pixel Barrel X residual for May2010 alignment update
PNGpng PIXX_May2010Alignment.png r1 manage 22.1 K 2010-06-02 - 12:58 UnknownUser Pixel Barrel X residual for May2010 alignment update
Unknown file formateps PIXX_Oct2010Alignment.eps r2 r1 manage 14.3 K 2010-10-28 - 16:01 SalvadorMarti  
PNGpng PIXX_Oct2010Alignment.png r2 r1 manage 111.5 K 2010-10-28 - 16:02 SalvadorMarti  
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PNGpng PIXY_Oct2010Alignment.png r2 r1 manage 128.7 K 2010-10-28 - 16:04 SalvadorMarti  
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Unknown file formateps SCTECX_May2010Alignment.eps r1 manage 13.8 K 2010-06-02 - 15:04 UnknownUser SCT Endcaps X Residual for May2010 Alignment
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Unknown file formateps SCTECX_OCT2010Alignment.eps r1 manage 15.0 K 2010-10-28 - 16:14 SalvadorMarti  
Unknown file formateps SCTECX_Oct2010Alignment.eps r1 manage 14.9 K 2010-10-27 - 18:58 SalvadorMarti  
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Unknown file formateps SCTX_May2010Alignment.eps r1 manage 14.8 K 2010-06-02 - 15:03 UnknownUser SCT Barrel X Residual for May2010 Alignment
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PNGpng TRTECR_Oct2010Alignment.png r2 r1 manage 130.6 K 2010-10-28 - 16:35 SalvadorMarti  
Unknown file formateps TRTEC_May2010Alignment.eps r1 manage 16.3 K 2010-06-02 - 15:05 UnknownUser TRT Endcaps Residual for May 2010 Alignment
PNGpng TRTEC_May2010Alignment.png r1 manage 23.3 K 2010-06-02 - 15:05 UnknownUser TRT Endcaps Residual for May 2010 Alignment
Unknown file formateps TRTR_May2010Alignment.eps r1 manage 15.6 K 2010-06-02 - 15:05 UnknownUser TRT Barrel Residual for May 2010 Alignment
PNGpng TRTR_May2010Alignment.png r1 manage 22.2 K 2010-06-02 - 15:04 UnknownUser TRT Barrel Residual for May 2010 Alignment
Unknown file formateps TRTR_Oct2010Alignment.eps r2 r1 manage 17.0 K 2010-10-28 - 16:18 SalvadorMarti  
PNGpng TRTR_Oct2010Alignment.png r2 r1 manage 136.0 K 2010-10-28 - 16:23 SalvadorMarti  
Unknown file formateps TRT_ECA_ResMap_RZ_May10.eps r1 manage 54.7 K 2010-10-29 - 12:13 SalvadorMarti  
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GIFgif TRT_ECA_ResMap_RZ_Oct10.gif r1 manage 25.1 K 2010-10-27 - 19:33 SalvadorMarti  
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GIFgif TRT_ECA_ResMaps_PhiZ_Oct10.gif r1 manage 23.7 K 2010-10-27 - 19:23 SalvadorMarti  
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Unknown file formateps TRT_barrel_ResMaps_May10.eps r1 manage 60.5 K 2010-10-29 - 11:53 SalvadorMarti  
GIFgif TRT_barrel_ResMaps_May10.gif r1 manage 37.5 K 2010-10-27 - 19:13 SalvadorMarti  
PNGpng TRT_barrel_ResMaps_May10.png r1 manage 102.0 K 2010-10-29 - 11:58 SalvadorMarti  
Unknown file formateps TRT_barrel_ResMaps_Oct10.eps r1 manage 63.6 K 2010-10-29 - 11:54 SalvadorMarti  
GIFgif TRT_barrel_ResMaps_Oct10.gif r1 manage 38.8 K 2010-10-27 - 19:13 SalvadorMarti  
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PNGpng data09_900GeV.00141749.physics_MinBias-VTX.n4-LR2-nt.root.z.png r1 manage 18.0 K 2009-12-12 - 12:50 PippaWells Beam spot z vs LB
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GIFgif data10_7TeV.00152166.express_express-DB_BEAMSPOT.f236_c103.MergeNt-nt-xz10.gif r3 r2 r1 manage 13.2 K 2010-04-16 - 23:13 UnknownUser  
Unknown file formateps data10_7TeV.00152166.express_express-DB_BEAMSPOT.f236_c103.MergeNt-nt-yx10.eps r3 r2 r1 manage 25.3 K 2010-04-16 - 23:13 UnknownUser  
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Unknown file formateps display_142165_lg.eps r1 manage 16.6 K 2009-12-14 - 09:29 KirillProkofiev  
GIFgif display_142165_lg.gif r1 manage 18.3 K 2009-12-12 - 21:04 KirillProkofiev longitudinal beam profile as seen in PV reconstruction
Unknown file formateps display_142165_tr.eps r1 manage 13.8 K 2009-12-14 - 09:29 KirillProkofiev  
GIFgif display_142165_tr.gif r1 manage 17.4 K 2009-12-12 - 21:05 KirillProkofiev transverse beam profile as seen in the PV reconstruction
Unknown file formateps display_142165_x.eps r1 manage 8.9 K 2009-12-14 - 09:30 KirillProkofiev  
GIFgif display_142165_x.gif r1 manage 11.4 K 2009-12-12 - 21:05 KirillProkofiev Distribution of X coordinate of reconstructed primary vertices
Unknown file formateps display_142165_y.eps r1 manage 8.8 K 2009-12-14 - 09:30 KirillProkofiev  
GIFgif display_142165_y.gif r1 manage 11.3 K 2009-12-12 - 21:06 KirillProkofiev Distribution of Y coordinate of reconstructed primary vertices
Unknown file formateps display_142165_z.eps r1 manage 8.6 K 2009-12-14 - 09:30 KirillProkofiev  
GIFgif display_142165_z.gif r1 manage 11.6 K 2009-12-12 - 21:06 KirillProkofiev Distribution of Z coordinate of reconstructed primary vertices.
Unknown file formateps kShort_SiTracks_pointing_D0_singleGaussFit.eps r1 manage 17.4 K 2009-12-11 - 21:37 PippaWells  
PNGpng kShort_SiTracks_pointing_D0_singleGaussFit.png r1 manage 22.4 K 2009-12-11 - 21:37 PippaWells  
Unknown file formateps kShort_SiTracks_pointing_singleGaussFit.eps r1 manage 19.6 K 2009-12-11 - 21:38 PippaWells  
PNGpng kShort_SiTracks_pointing_singleGaussFit.png r1 manage 24.1 K 2009-12-11 - 21:38 PippaWells  
Unknown file formateps kShort_SiTracks_singleGaussFit.eps r1 manage 19.4 K 2009-12-11 - 21:38 PippaWells  
PNGpng kShort_SiTracks_singleGaussFit.png r1 manage 23.6 K 2009-12-11 - 21:39 PippaWells  
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Topic revision: r37 - 2010-11-23 - PippaWells
 
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