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ApprovedPlotsTilePileUpNoisePerformance
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Introduction
Pileup Noise Performance.
Pileup Noise Performance
Pileup Noise (2012)
 The noise distribution in different TileCal cells is represented as a function of  of the cells for zero bias run 208781 of 2012 at a centreofmass energy of 8 TeV with a bunch spacing of 50 ns and an average number of interactions < > = 15.7 per bunch crossing). The Monte Carlo was reweighted to the average number of interactions in data, according to the weight given by the PileUpReweighting tool. The noise was estimated as the standard deviation of the measured cell energy distribution. The top left (right) histogram shows the results obtained for the cells of Layer A (Layer BC). The bottom left (right) histogram shows the results obtained for the cells of Layer D (Special Cells). Contact: Juan Pedro Araque juan.pedro.araque.espinosa@cernNOSPAMPLEASE.ch Reference: ATLCOMTILECAL2011022  [pdf] [eps]  The noise distribution in different TileCal cells is represented as a function of  of the cells for zero bias run 216416 of 2012 at a centreofmass energy of 8 TeV with a bunch spacing of 25 ns and an average number of interactions < > = 10.0 per bunch crossing). The Monte Carlo was reweighted to the average number of interactions in data, according to the weight given by the PileUpReweighting tool. The noise was estimated as the standard deviation of the measured cell energy distribution. The top left (right) histogram shows the results obtained for the cells of Layer A (Layer BC). The bottom left (right) histogram shows the results obtained for the cells of Layer D (Special Cells). Contact: Juan Pedro Araque juan.pedro.araque.espinosa@cernNOSPAMPLEASE.ch Reference: ATLCOMTILECAL2011022  [pdf] [eps] 
The noise in D5 and D6 cells of the Tile calorimeter, located at the outermost layer with 0.9 < η < 1.3, is plotted against the average number of interactions per event. The dashed line shows the electronic noise contribution estimated from special pedestal runs.
The noise was estimated as the RMS of the energy deposited in the cell in zero bias data in collisions with a centerofmass energy of 8 TeV and bunch spacing of 25 ns. The data beam parameters and structure were simulated in the MonteCarlo events. The data points refer to the D5 and D6 cells of the Extended Barrel modules EBA39 and EBC39 because they were powered by the new generation low noise Low Voltage Power Supplies, which are going to be used in the whole calorimeter in Run 2.
Contact: Vladimir Drugakov v.drugakov@cernNOSPAMPLEASE.ch
Reference: ATLCOMTILECAL2013035 Date: 16 Aug 2013

eps version of the figure

Energy distribution for data collected in 2012 in the zerobias stream with 50 ns bunch spacing at a centreofmass energy of 8 TeV and
Monte Carlo simulation for the layer A cell with in the Tile Calorimeter. An integration over all modules has been performed.
The energy reconstruction method is the default reconstruction method used in Run 1. The depicted distributions correspond to two
different pileup conditions with (blue) and (red). The ratio between Data and Monte Carlo simulation is shown in the
lower plot. It can be seen that for higher values of the energy distribution gets wider, showing an increasing pileup noise. A
reasonable agreement between data and Monte Carlo simulation is found above 200 MeV. The small difference in the energy
distribution between the Data and Monte Carlo simulation translates into a few tens of MeV difference in the pileup noise, as can be
seen comparing the values written in the figure.
Contact: Aliaksei Hrynevich aliaksei.hrynevich@cernNOSPAMPLEASE.ch
Reference: ATLCOMTILECAL2015012
Date: March 10, 2015

[PDF]

Noise comparison as a function of the mean number of interactions per crossing between data
collected in 2012 in the zerobias stream with 50 ns bunch spacing at a centreofmass energy of 8
TeV and Monte Carlo simulation for the cells in the layer A of the Tile Calorimeter. For data the runs
201555, 205112, 207397, 208781, 210302, 211973 have been used. The noise is derived as the
standard deviation of the energy distribution. In the region where data and Monte Carlo simulation
overlap a good agreement can be seen, with the highest different being of the order of MeV.
Contact: Juan Pedro Araque jp.araque@cernNOSPAMPLEASE.ch
Reference: ATLCOMTILECAL2015012
Date: March 10, 2015

[PDF]

The energy distribution for the cell in the layer A with as a function of the mean number of interactions per
crossing using data collected in 2012 in the zerobias stream with 50 ns bunch spacing and a centreofmass energy of 8
TeV using the default energy reconstruction method used in Run 1. The runs 201555, 205112, 207397, 208781, 210302,
211973 have been used. Different colours represent different regions populated by the 68.27%(red), 95.45% (yellow),
99.73% (green) and 99.99% (blue) of the events. These regions have been derived using the quantiles of the energy
distribution which are used to find the energy values defining the regions populated by each percentage of events. This
figure shows the nongaussian behaviour of the energy distribution given that in a gaussian regime each of the for regions
would scale with the standard deviation and be symmetric.
Contact: Juan Pedro Araque jp.araque@cernNOSPAMPLEASE.ch
Reference: ATLCOMTILECAL2015012
Date: March 10, 2015

[PDF]

Comparison between the RMS of the energy distribution scaled by a factor of 2 (dark yellow circle) and 4 (blue circle) and the
width of the regions that contains the 95.45% (filled dark yellow circle) and 99.99% (filled blue circle) of the events in the energy
distributions (solid circles) for the cell in the layer A with . Data collected in 2012 in the zerobias stream with 50
ns bunch spacing and a centreofmass energy of 8 TeV has been used. The runs 201555, 205112, 207397, 208781, 210302,
211973 have been analysed. Both methods should be similar for the yellow and blue values respectively if the energy
distribution were gaussian. It can be seen that given the nongaussian behaviour of the energy distribution the scaled RMS
values are different from the quantiles approach, usually larger due to the larger tails in comparison with what would be
expected in a gaussian regime.
Contact: Juan Pedro Araque jp.araque@cernNOSPAMPLEASE.ch
Reference: ATLCOMTILECAL2015012
Date: March 10, 2015

[PDF]

Comparison between the RMS of the energy distribution scaled by a factor of 2 (dark yellow circle) and 4 (blue
circle) and the width of the regions that contains the 95.45% (filled dark yellow circle) and 99.99% (filled blue circle)
of the events in the energy distributions (solid circles) for the cell in the layer D with . Data collected in
2012 in the zerobias stream with 50 ns bunch spacing and a centreofmass energy of 8 TeV has been used. The
runs 201555, 205112, 207397, 208781, 210302, 211973 have been analysed. Both methods should be similar for the
yellow and blue values respectively if the energy distribution were gaussian. It can be seen that given the non gaussian
behaviour of the energy distribution the scaled RMS values are different from the quantiles approach,
usually larger due to the larger tails in comparison with what would be expected in a gaussian regime.
Contact: Juan Pedro Araque jp.araque@cernNOSPAMPLEASE.ch
Reference: ATLCOMTILECAL2015012
Date: March 10, 2015

[PDF]

Comparison between the RMS of the energy distribution scaled by a factor of 2 (hollow markers) and the width of the
regions that contains the 95.45% of the events in the energy distributions (filled markers) for the cell in the layer A
with (circular markers) and the cell in the layer D with (squared markers). Data collected
in 2012 in the zerobias stream with 50 ns bunch spacing and a centreofmass energy of 8 TeV has been used. The
runs 201555, 205112, 207397, 208781, 210302, 211973 have been analysed.It can be seen how different can have
different shape in the energy distribution, e.g. the difference seen for the cell in the layer A is smaller for low values of
and grows bigger for high values of while the difference for the layer D cell is maintained.
Contact: Juan Pedro Araque jp.araque@cernNOSPAMPLEASE.ch
Reference: ATLCOMTILECAL2015012
Date: March 10, 2015

[PDF]

Pileup Noise (2011)
 The noise distribution in different TileCal cells is represented as a function of  of the cells for zero bias run 182424 of period F2 of 2011 data (at a centreofmass energy of 7 TeV with a bunch spacing of 50 ns and an average number of interactions < > = 4.8 per bunch crossing). The Monte Carlo was reweighted to the average number of interactions in data, according to the weight given by the PileUpReweighting tool. The noise was estimated as the standard deviation of the measured cell energy distribution. The top left (right) histogram shows the results obtained for the cells of Layer A (Layer BC). The bottom left (right) histogram shows the results obtained for the cells of Layer D (Special Cells). Contact: Susana Santos Susana.Patricia.Santos@cernNOSPAMPLEASE.ch Reference: ATLCOMTILECAL2011022  [pdf] [eps]  The noise distribution in different TileCal cells is represented as a function of  of the cells for zero bias run 190617 of period M2 of 2011 data (at a centreofmass energy of 7 TeV with a bunch spacing of 50 ns and an average number of interactions < > = 11.3 per bunch crossing). The Monte Carlo was reweighted to the average number of interactions in data, according to the weight given by the PileUpReweighting tool. The noise was estimated as the standard deviation of the measured cell energy distribution. The top left (right) histogram shows the results obtained for the cells of Layer A (Layer BC). The bottom left (right) histogram shows the results obtained for the cells of Layer D (Special Cells). Contact: Susana Santos Susana.Patricia.Santos@cernNOSPAMPLEASE.ch Reference: ATLCOMTILECAL2011022  [pdf] [eps]  The TileCal noise dependence with the actual number of interactions, , is represented, for several zero bias data runs from different periods of 2011. The noise was estimated as the standard deviation of the mean energy value per cell. The black markers represent data and the red points Monte Carlo. The different marker styles correspond to different cell layers in the TileCal. Contact: Serguei Yanush Serguei.Yanush@cernNOSPAMPLEASE.ch Reference: ATLCOMTILECAL2011022  [pdf] [eps] 
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