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CMS Luminosity Results From Public Documents

This page collects all of the approved, public luminosity calibration plots for Run 1. For similar information for Run 2, please consult the Luminosity Preliminary Results page.

Links to Other Public CMS Results

Physics Analysis Summaries (PAS)

The following figures are from the respective PASes.

CMS Luminosity Based on Pixel Cluster Counting - Summer 2013 Update (CMS-PAS-LUM-13-001)

under construction
Beam-spot centroid longitudinal position as a function of the beam separation during a horizontal scan.
April 2012 campaign. The strong correlation (as observed) is due to the finite crossing angle. Full size version of the plot:

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Beam-spot centroid longitudinal position as a function of the beam separation during a horizontal scan.
November 2012 campaign. Full size version of the plot:

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Luminous region RMS in the vertical plane as a function of the beam separation during a horizontal scan.
April 2012 campaign. Non-factorisable beam charge density distributions are expected to produce correlations as observed in this scan. Full size version of the plot:

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Luminous region RMS in the vertical plane as a function of the beam separation during a horizontal scan.
November 2012 campaign. Full size version of the plot:

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Overview of the November VdM scans.
The horizontal axis of the sketch lists the conditions of the scan (the axis of the scan and the offset), while the size of the peaks indicates the relative size of the observed rate. Full size version of the plot:

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Example of a rate profile fit.
This specific case corresponds to BX 721 and scan pair number 0. Full size version of the plot:

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Estimates for the visible cross-section for each BX and head-on scan pair performed during fill 3316.
The first four scans (two scan pairs) occurred consecutively within  1h, the last scan pair took place  2h later. Full size version of the plot:

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Length scale calibration.
The relation between the measured center of the luminous region and the nominal crossing position for the horizontal scanning plane and both calibration fills. The two different markers/colors correspond to the two sets of scan points with opposite directions of approach. Full size version of the plot:

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Length scale calibration.
The relation between the measured center of the luminous region and the nominal crossing position for the vertical scanning plane and both calibration fills. The two different markers/colors correspond to the two sets of scan points with opposite directions of approach. Full size version of the plot:

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Time dependency of the luminosity (black) and the beam currents product (red).
Full size version of the plot:

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Time evolution of the rate profile widths for each BX considered in the analysis.
Solid (empty) crosses stands for horizontal (vertical) scans. Full size version of the plot:

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Orbit drift.
Difference of the estimated beams orbits at the CMS IP in the horizontal (solid crosses) and vertical (empty crosses). Full size version of the plot:

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Beam-beam deflection.
Analytic estimation of the beam beam deflection as a function of the beam separation for parameters typical of fill 3316. Full size version of the plot:

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Pull - HF vs pixels.
Distribution of the difference between of the rate profile widths as measured by the cluster counting method and by the HF divided by the statistical uncertainty. Full size version of the plot:

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Pixel clusters - relative contribution.
Relative contributions of different pixel detector regions to the total cluster count as a function of the run number for the 2012 physics runs. Full size version of the plot:

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Pixel clusters relative contribution vs Pile-up.
Pileup (upper plot) and relative contributions of different pixel detector regions (down) as a function of time during fill 3236. The drop in luminosity around 10h after the beginning is due to an end-of-fill VdM scan. Full size version of the plot:

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Pixel cluster efficiency.
Pixel cluster efficiency drop for various detector components as a function of the instantaneous luminosity. Full size version of the plot:

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Pixel cluster efficiency.
Pixel cluster efficiency drop for various detector components as a function of the L1 trigger rate. Full size version of the plot:

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Beam spot position.
Distribution of the beam-spot in the longitudinal direction for the 2012 LHC run. Full size version of the plot:

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Cluster multiplicity vs vertex position.
Expected number of hits as a function of the longitudinal position of the generated interaction vertex. Full size version of the plot:

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CMS Luminosity Based on Pixel Cluster Counting - Summer 2012 Update (CMS-PAS-LUM-12-001)

The relation between the observed center of the luminous region and the nominal position.
The figure represents the horizontal scanning plane. The two different markers/colors correspond to the two sets of scan points with opposite directions of approach. Full size version of the plot:

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The relation between the observed center of the luminous region and the nominal position.
The figure represents the vertical scanning plane. The two different markers/colors correspond to the two sets of scan points with opposite directions of approach. Full size version of the plot:

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Beam shape fits for the first Van der Meer scan (beam crossing 721) in LHC Fill 2520.
Number of pixel clusters as a rate variable, X-plane scan. Full size version of the plot:

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Beam shape fits for the first Van der Meer scan (beam crossing 721) in LHC Fill 2520.
Number of pixel clusters as a rate variable, Y-plane scan. Full size version of the plot:

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Beam shape fits for the first Van der Meer scan (beam crossing 721) in LHC Fill 2520.
Number of vertices as a rate variable, X-plane scan. Full size version of the plot:

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Beam shape fits for the first Van der Meer scan (beam crossing 721) in LHC Fill 2520.
Number of vertices as a rate variable, Y-plane scan. Full size version of the plot:

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The evolution of the observed pixel cluster cross section as a function of the scan pair.
There is a clear, so far not understood, upward trend. Awaiting further understanding this trend is taken into account as a systematic uncertainty. Full size version of the plot:

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Comparison between visible cross sections obtained during the Van der Meer scans.
The figure represents the ratio between pixel cluster counting and HF zero-counting. Ratio scaled to average to unity. Full size version of the plot:

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Comparison between visible cross sections obtained during the Van der Meer scans.
The figure represents the ratio between vertex counting and HF zero-counting. Ratio scaled to average to unity. Full size version of the plot:

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Comparison between visible cross sections obtained during the Van der Meer scans.
The figure represents the ratio between BCM1F zero-counting and HF zero-counting. Ratio scaled to average to unity. Full size version of the plot:

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Results of the pixel afterglow ‘deconvolution fit’.
The main difference with respect to 2011 lies in the ‘BX+1’ ghost response parameter a1. This effect is due to the minimum cluster size and charge cuts and does not affect the afterglow correction values. Linear scale version of the figure. Full size version of the plot:

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Results of the pixel afterglow ‘deconvolution fit’.
The main difference with respect to 2011 lies in the ‘BX+1’ ghost response parameter a1. This effect is due to the minimum cluster size and charge cuts and does not affect the afterglow correction values. Logarithmic scale version of the figure. Full size version of the plot:

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Relative contributions of different pixel detector regions to the total cluster count.
The shaded band indicates a \pm 1.5% window of stability for the contribution of the barrel to the overall cluster count. (The total barrel contribution is > 70%.) Full size version of the plot:

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Relative contributions of different pixel detector regions to the total cluster count.
The figure represents result sfor the forward pixel detector region. Full size version of the plot:

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Absolute Calibration of the Luminosity Measurement at CMS: Winter 2012 Update (CMS-PAS-SMP-12-008)

Representative results from the May 2011 VdM scans
Scan in the x plane for beam crossing 2752 using the mean number of pixels per zero-bias trigger as the rate variable. Length-scale corrections have not been applied. Full size versions of the plot:

pdf version

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Representative results from the May 2011 VdM scans
Scan in the y plane for beam crossing 2752 using the mean number of pixels per zero-bias trigger as the rate variable. Length-scale corrections have not been applied. Full size versions of the plot:

pdf version

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Representative results from the May 2011 VdM scans
Scan in the x plane for beam crossing 2752 using the mean number of vertices per zero-bias trigger as the rate variable. Length-scale corrections have not been applied. Full size versions of the plot:

pdf version

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Representative results from the May 2011 VdM scans
Scan in the y plane for beam crossing 2752 using the mean number of vertices per zero-bias trigger as the rate variable. Length-scale corrections have not been applied. Full size versions of the plot:

pdf version

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Absolute Calibration of Luminosity Measurement at CMS: Summer 2011 Update (CMS-PAS-EWK-11-001)

Cross section for vertex production plotted as a function of instantaneous singlebunch luminosity
The cross section measurement is based on the online calibration for the luminosity measurement. Full size versions of the plot:

pdf version

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Response of the HF online system to a single bunch with luminosity in BX0
The plot has been normalized such that the value in BX0 is one. Full size versions of the plot:

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VdM scans using the HF Online method
The figure represents the LHC Fill 1753 (May 2011) X scan. Length-scale corrections have not been applied. Full size versions of the plot:

pdf version

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VdM scans using the HF Online method
The figure represents the LHC Fill 1753 (May 2011) Y scan. Length-scale corrections have not been applied. Full size versions of the plot:

pdf version

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VdM scans using the HF Online method
The figure represents the LHC Fill 1875 (June 2011) X scan. Length-scale corrections have not been applied. Full size versions of the plot:

pdf version

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VdM scans using the HF Online method
The figure represents the LHC Fill 1875 (June 2011) Y scan. Length-scale corrections have not been applied. Full size versions of the plot:

pdf version

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VdM scans using the offline simple-vertex-counting method
The figure represents the LHC Fill 1753 (May 2011) X scan. Length-scale corrections have not been applied. Full size versions of the plot:

pdf version

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VdM scans using the offline simple-vertex-counting method
The figure represents the LHC Fill 1753 (May 2011) Y scan. Length-scale corrections have not been applied. Full size versions of the plot:

pdf version

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Calibration correction constants
kx (left) and ky (right) for the 1041 bunches in the LHC Fill 1875 (June 2011) scans. Full size versions of the plot:

pdf version

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Measurement of CMS Luminosity (CMS-PAS-EWK-10-004)

Relative luminosity versus bunch crossing
Shown for LHC Fill 1089. The instantaneous luminosity during this fill was approximately 2 × 10^{28} cm^{−2} s^{−1}. Beams were colliding only in BX 1. BX’s 892 and 1786, which are not colliding bunches, are used to estimate the background levels for the various methods. Rates are shown for the HF online method as well as the two offline methods described below. In all cases, the luminosities were normalized to unity in BX 1, with the points for the HF online and offline methods displaced slightly so that all three points are visible. Full size versions of the plot:

pdf version

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Variables and cuts used on offline HF event selection
Full size versions of the plot:

pdf version

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Van der Meer scan results
The figure represents the LHC fill 1058 X scan. The blue curve is the total double- Gaussian, the red curve is the core Gaussian (sig1), and the green curve is the Gaussian for the tails (sig2). Full size versions of the plot:

pdf version

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Van der Meer scan results
The figure represents the LHC fill 1058 Y scan. The blue curve is the total double- Gaussian, the red curve is the core Gaussian (sig1), and the green curve is the Gaussian for the tails (sig2). Full size versions of the plot:

pdf version

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Van der Meer scan results
The figure represents the LHC fill 1089 X scan. The blue curve is the total double- Gaussian, the red curve is the core Gaussian (sig1), and the green curve is the Gaussian for the tails (sig2). Full size versions of the plot:

pdf version

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Van der Meer scan results
The figure represents the LHC fill 1089 Y scan. The blue curve is the total double- Gaussian, the red curve is the core Gaussian (sig1), and the green curve is the Gaussian for the tails (sig2). Full size versions of the plot:

pdf version

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Calibration relative to MC normalization
Shown at the five central zero points in the LHC Fill 1089. The different sets of points show the corrections as propagated from the four different pairs of measured x and y beam widths. The uncorrected points for the reverse x and forward y pair are also shown in black. Full size versions of the plot:

pdf version

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-- StoyanStoynev - 31-Oct-2012

Topic attachments
I Attachment History Action Size Date Who Comment
PNGpng 2012_ratio_Feb25.png r1 manage 56.0 K 2013-12-17 - 14:48 StoyanStoynev pixel cluster fractional contributions
PDFpdf BXrates.pdf r1 manage 25.9 K 2012-11-02 - 10:34 StoyanStoynev Relative rates (2010) - pdf version
PNGpng BXrates.png r1 manage 9.0 K 2012-11-02 - 10:33 StoyanStoynev Relative rates (2010)
PNGpng CMSLogo.png r1 manage 19.4 K 2012-11-02 - 11:14 StoyanStoynev CMS logo
PDFpdf HFOfflineCuts.pdf r1 manage 99.6 K 2012-11-02 - 10:35 StoyanStoynev Offline cuts (2010) - pdf version
PNGpng HFOfflineCuts.png r1 manage 21.8 K 2012-11-02 - 10:34 StoyanStoynev Offline cuts (2010)
PDFpdf HFOnFill1753XBX81.pdf r1 manage 17.1 K 2012-11-02 - 09:43 StoyanStoynev VdM scan X May 2011 - pdf version
PNGpng HFOnFill1753XBX81.png r1 manage 14.3 K 2012-11-02 - 09:42 StoyanStoynev VdM scan X May 2011
PDFpdf HFOnFill1753YBX81.pdf r1 manage 17.0 K 2012-11-02 - 09:44 StoyanStoynev VdM scan Y May 2011 - pdf version
PNGpng HFOnFill1753YBX81.png r1 manage 14.6 K 2012-11-02 - 09:44 StoyanStoynev VdM scan Y May 2011
PDFpdf HFOnFill1875XBX45.pdf r1 manage 16.9 K 2012-11-02 - 09:46 StoyanStoynev VdM scan X June 2011 - pdf version
PNGpng HFOnFill1875XBX45.png r1 manage 14.0 K 2012-11-02 - 09:45 StoyanStoynev VdM scan X June 2011
PDFpdf HFOnFill1875YBX45.pdf r1 manage 16.8 K 2012-11-02 - 09:48 StoyanStoynev VdM scan Y June 2011 - pdf version
PNGpng HFOnFill1875YBX45.png r1 manage 14.5 K 2012-11-02 - 09:47 StoyanStoynev VdM scan Y June 2011
PNGpng NovScan_sketch.png r1 manage 124.6 K 2013-12-16 - 21:30 StoyanStoynev VdM sketch (November 2012)
PNGpng SigmaVisComparison_scaledBCM1FoverHF.png r1 manage 28.0 K 2012-10-31 - 12:38 StoyanStoynev ratio of visible cross sections - BCM1F over HF
PNGpng SigmaVisComparison_scaledPixoverHF.png r1 manage 28.3 K 2012-10-31 - 12:37 StoyanStoynev ratio of visible cross sections - pixel over HF
PNGpng SigmaVisComparison_scaledVtxoverHF.png r1 manage 28.3 K 2012-10-31 - 12:38 StoyanStoynev ratio of visible cross sections - vertex over HF
PNGpng SingleBunchAfterglow.png r1 manage 14.8 K 2012-11-02 - 09:40 StoyanStoynev HF response (2011)
PDFpdf VertexCrossSectionFromCounting.pdf r1 manage 14.2 K 2012-11-02 - 09:39 StoyanStoynev Vertex cross-section (2011) - pdf version
PNGpng VertexCrossSectionFromCounting.png r1 manage 6.8 K 2012-11-02 - 09:39 StoyanStoynev Vertex cross-section (2011)
PDFpdf VertexOffFill1753XBX817.pdf r1 manage 17.0 K 2012-11-02 - 09:49 StoyanStoynev VdM scan X May 2011 (vertex) - pdf version
PNGpng VertexOffFill1753XBX817.png r1 manage 15.5 K 2012-11-02 - 09:49 StoyanStoynev VdM scan X May 2011 (vertex)
PDFpdf VertexOffFill1753YBX817.pdf r1 manage 16.9 K 2012-11-02 - 09:51 StoyanStoynev VdM scan Y May 2011 (vertex) - pdf version
PNGpng VertexOffFill1753YBX817.png r1 manage 13.9 K 2012-11-02 - 09:50 StoyanStoynev VdM scan Y May 2011 (vertex)
PNGpng bb_example.png r1 manage 32.0 K 2013-12-17 - 14:40 StoyanStoynev beam-beam deflection
PNGpng bs_Z_jitter.png r1 manage 5.8 K 2013-12-17 - 15:01 StoyanStoynev beamspot Z jitter
PNGpng graph_pixel_model2b_scanpair0_bx721.png r1 manage 236.2 K 2013-12-16 - 21:34 StoyanStoynev rate profile
PNGpng graph_pixel_scan0_x_bx721.png r1 manage 160.1 K 2012-11-02 - 11:42 StoyanStoynev VdM scan X 2012, Fill 2520, BX 721, pixel
PNGpng graph_pixel_scan1_y_bx721.png r1 manage 178.9 K 2012-10-31 - 12:32 StoyanStoynev VdM scan Y 2012, Fill 2520, BX 721, pixel
PDFpdf graph_scan0_x_bx2752_all.pdf r1 manage 239.0 K 2012-10-31 - 11:11 StoyanStoynev VdM scan X 2011 (pixel) - pdf version
PNGpng graph_scan0_x_bx2752_all.png r1 manage 18.1 K 2012-10-31 - 11:10 StoyanStoynev VdM scan X 2011 (pixel)
PDFpdf graph_scan1_y_bx2752_all.pdf r1 manage 238.9 K 2012-10-31 - 11:34 StoyanStoynev VdM scan Y 2011 (pixel) - pdf version
PNGpng graph_scan1_y_bx2752_all.png r1 manage 18.2 K 2012-10-31 - 11:33 StoyanStoynev VdM scan Y 2011 (pixel)
PNGpng graph_vertex_scan0_x_bx721.png r1 manage 161.7 K 2012-10-31 - 12:33 StoyanStoynev VdM scan X 2012, Fill 2520, BX 721, vertex
PNGpng graph_vertex_scan1_y_bx721.png r1 manage 171.4 K 2012-10-31 - 12:33 StoyanStoynev VdM scan Y 2012, Fill 2520, BX 721, vertex
PDFpdf kValuesJuneScan.pdf r1 manage 14.5 K 2012-11-02 - 09:52 StoyanStoynev Callibration correction constants (June 2011) - pdf version
PNGpng kValuesJuneScan.png r1 manage 6.1 K 2012-11-02 - 09:51 StoyanStoynev Callibration correction constants (June 2011)
PNGpng lumiN2slopes.png r1 manage 10.0 K 2013-12-16 - 22:08 StoyanStoynev lumi and beam current slopes
PNGpng lumi_mult_vs_vtxpos.png r1 manage 16.2 K 2013-12-17 - 15:04 StoyanStoynev cluster multiplicity vs vertex position
PNGpng mean_z_scanPlanex_Apr_new.png r1 manage 15.1 K 2013-12-15 - 18:16 StoyanStoynev Beam-spot centroid (April 2012)
PNGpng mean_z_scanPlanex_Nov_new.png r1 manage 19.7 K 2013-12-15 - 18:21 StoyanStoynev Beam-spot centroid (November 2012)
PNGpng orbitDrift.png r1 manage 21.3 K 2013-12-17 - 14:36 StoyanStoynev orbit drift
PNGpng pixel_afterglow_fill2580_fit_lin.png r1 manage 226.5 K 2012-10-31 - 12:40 StoyanStoynev Cluster count - linear
PNGpng pixel_afterglow_fill2580_fit_log.png r1 manage 250.0 K 2012-10-31 - 12:41 StoyanStoynev Cluster count - liogarithmic
PNGpng pixel_efficiency3.png r1 manage 106.4 K 2013-12-17 - 14:57 StoyanStoynev pixel cluster efficiecny vs ins. lumi
PNGpng pixel_efficiency4.png r1 manage 112.9 K 2013-12-17 - 14:57 StoyanStoynev pixel cluster efficiecny vs L1 trigger rate
PNGpng pixel_frac_barrel.png r1 manage 90.1 K 2012-10-31 - 12:42 StoyanStoynev Relative pixel detector region contributions - barrel
PNGpng pixel_frac_forward.png r1 manage 120.3 K 2012-10-31 - 12:43 StoyanStoynev Relative pixel detector region contributions - forward
PNGpng pull_HF_vs_pixels.png r1 manage 13.9 K 2013-12-17 - 14:44 StoyanStoynev pull HF vs pixels
PNGpng ratio_pileup.png r1 manage 11.8 K 2013-12-17 - 14:54 StoyanStoynev pile up and pixel cluster relative contributions
PNGpng rms_y_scanPlanex_Apr_new.png r1 manage 20.8 K 2013-12-16 - 21:19 StoyanStoynev Lumi region RMS, Y (April 2012)
PNGpng rms_y_scanPlanex_Nov_new.png r1 manage 24.4 K 2013-12-16 - 21:19 StoyanStoynev Lumi region RMS, Y (November 2012)
PNGpng sigmavis.png r1 manage 11.3 K 2013-12-16 - 21:37 StoyanStoynev visible cross-section (fill 3316)
PNGpng vdm_evolution_xsec_pixel.png r1 manage 129.8 K 2012-10-31 - 12:34 StoyanStoynev Evolution of the pixel cluster cross-section
PDFpdf vertexVDMxFitScan1.pdf r1 manage 17.0 K 2012-10-31 - 11:35 StoyanStoynev VdM scan X 2011 (vertex) - pdf version
PNGpng vertexVDMxFitScan1.png r1 manage 13.8 K 2012-10-31 - 11:34 StoyanStoynev VdM scan X 2011 (vertex)
PDFpdf vertexVDMyFitScan1.pdf r1 manage 16.9 K 2012-10-31 - 11:35 StoyanStoynev VdM scan Y 2011 (vertex) - pdf version
PNGpng vertexVDMyFitScan1.png r1 manage 13.7 K 2012-10-31 - 11:35 StoyanStoynev VdM scan Y 2011 (vertex)
PNGpng vtx_x_ls_scan_plane_x.png r3 r2 r1 manage 151.3 K 2013-12-17 - 14:21 StoyanStoynev length scale calibration (X)
PNGpng vtx_x_ls_scan_plane_x_NEW.png r1 manage 163.8 K 2013-12-16 - 21:53 StoyanStoynev new length scale calibration (X)
PNGpng vtx_y_ls_scan_plane_y.png r3 r2 r1 manage 140.7 K 2013-12-17 - 14:21 StoyanStoynev length scale calibration (Y)
PNGpng vtx_y_ls_scan_plane_y_NEW.png r1 manage 168.2 K 2013-12-16 - 21:53 StoyanStoynev new length scale calibration (Y)
PNGpng width_perBX.png r1 manage 12.7 K 2013-12-16 - 22:08 StoyanStoynev rate profile width vs time
PDFpdf x-scan-2010-PAS-fill1058.pdf r1 manage 56.5 K 2012-11-02 - 10:37 StoyanStoynev VdM scan X 2010 - pdf version
PNGpng x-scan-2010-PAS-fill1058.png r1 manage 26.2 K 2012-11-02 - 10:36 StoyanStoynev VdM scan X 2010
PDFpdf xScan_1089_log.pdf r1 manage 47.6 K 2012-11-02 - 10:41 StoyanStoynev VdM scan X 2010 (fill 1089, log) - pdf version
PNGpng xScan_1089_log.png r1 manage 13.1 K 2012-11-02 - 10:41 StoyanStoynev VdM scan X 2010 (fill 1089, log)
PDFpdf y-scan-2010-PAS-fill1058.pdf r1 manage 56.9 K 2012-11-02 - 10:38 StoyanStoynev VdM scan Y 2010 - pdf version
PNGpng y-scan-2010-PAS-fill1058.png r1 manage 27.9 K 2012-11-02 - 10:38 StoyanStoynev VdM scan Y 2010
PDFpdf yScan_1089_log.pdf r1 manage 47.6 K 2012-11-02 - 10:43 StoyanStoynev VdM scan Y 2010 (fill 1089, log) - pdf version
PNGpng yScan_1089_log.png r1 manage 13.1 K 2012-11-02 - 10:42 StoyanStoynev VdM scan Y 2010 (fill 1089, log)
PDFpdf zero-points-calib-scan-2010-PAS-emit-corrected-fill1089.pdf r1 manage 14.3 K 2012-11-02 - 10:45 StoyanStoynev Calibration relative to MC (2010) - pdf version
PNGpng zero-points-calib-scan-2010-PAS-emit-corrected-fill1089.png r1 manage 19.4 K 2012-11-02 - 10:44 StoyanStoynev Calibration relative to MC (2010)
Topic revision: r8 - 2018-05-23 - PaulLujan
 
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