CMS-DP-2015/065

Validation of 2015 laser corrections with electrons

Abstract: History plot for 2015 data of the ratio of electron energy E, measured in the ECAL Barrel, to the electron momentum p, measured in the tracker

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Figure Caption
pdf version
EB   history vsTime.png
Electrons E/p history

History plot for 2015 data of the ratio of electron energy E, measured in the ECAL Barrel, to the electron momentum p, measured in the tracker:
the dataset corresponds to the prompt-reconstruction with the 2015 startup calibrations the electrons are selected from W→eν and Z→ee decays. Each point in the plot is computed from 5000 selected events with the reconstructed electron located in the ECAL Barrel;
the E/p distribution for each point is fitted to a template E/p distribution measured from data (using the entire 2015 dataset) in order to provide a relative scale for the E/p measurement versus time;
the history plots are shown before (red points) and after (green points) corrections to ECAL crystal response variations due to transparency loss are applied;
A stable energy scale is achieved throughout 2015 run after applying laser corrections: ECAL Barrel: average signal loss ~6%, RMS stability after corrections 0.14%

-- EmanueleDiMarco - 2015-12-16

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I Attachment History Action Size Date Who Comment
PDFpdf EB___history_vsTime.pdf r1 manage 288.6 K 2015-12-16 - 15:25 EmanueleDiMarco  
PNGpng EB___history_vsTime.png r1 manage 136.2 K 2015-12-16 - 15:25 EmanueleDiMarco  
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Topic revision: r1 - 2015-12-16 - EmanueleDiMarco
 
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