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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 hitsontracks 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. 
eps version of the figure 
 
Unbiased residual distribution in x, integrated over all hitsontracks 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. 
eps version of the figure 
 
Unbiased residual distribution in x, integrated over all hitsontracks 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. 
eps version of the figure 
 
Unbiased residual distribution in x, integrated over all hitsontracks 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. 
eps version of the figure 
 
The TRT unbiased residuals, as obtained from 7 TeV collision data (run 153565) and Monte Carlo, separately for the barrel and endcaps. 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 FullWidthHalfMaximum 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 endcap data (MC), respectively. For these lowmomentum tracks, the width of the residual distribution is larger than the intrinsic accuracy per hit expected from the drifttime measurement because of the contribution from multiple scattering to the track parameter errors. The measured resolution in the endcaps is worse than in the barrel and than that expected from the Monte Carlo. Unlike the barrel, the TRT endcap geometry did not allow for detailed studies with cosmic rays, further commissioning of the TRT endcaps is required to achieve performance similar to that of the barrel. 
eps version of the figure eps version of the figure 

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. 
eps version of the figure 
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. 
eps version of the figure 
Distribution of the local x unbiased residuals of the pixel endcap 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. 
eps version of the figure 
Distribution of the local y unbiased residuals of the pixel endcap 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. 
eps version of the figure 
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 microstrip direction. 
eps version of the figure 
Distribution of the local x unbiased residuals of the SCT endcap 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 microstrip direction. 
eps version of the figure 
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 endcaps. 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 lowmomentum 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. 
eps version of the barrel residuals figure eps version of the endcap residuals figure 
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 wirebywire alignment in the October 2010 alignment constants, where the average residuals are centered around zero with no evidence of variation of along the straw. 
eps version of the May10 residual maps figure eps version of the Oct10 residual maps figure 
TRT endcap A residual maps for May 2010 alignment (left) and October 2010 alignment (right). The mean residual is plotted as a function of the TRT endcap wheel number (increasing with increasing global z) and ϕ sector position of the reconstructed hit. Coherent misalignments corresponding to endcap 4plane 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 wirebywire 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. 
eps version of the May10 residual maps figure eps version of the Oct10 residual maps figure 
TRT endcap A residual maps for May 2010 alignment (left) and October 2010 alignment (right). The mean residual is plotted as a function of the TRT endcap 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 endcap 4plane 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 backtoback mechanical assembly of the TRT endcap wheels. These misalignments are removed by the wirebywire alignment in the October 2010 alignment constants, where the average residuals are centered around zero with no evidence of variation of along the straw. 
eps version of the May10 residual maps figure eps version of the Oct10 residual maps figure 