HCAL Timing as a means of out-of-time background rejection


This analysis is intended to determine the best means of using HCAL precise hit time reconstruction to reject backgrounds that are "out-of-time" with respect to the signal. The signal of interest is a missing energy signal consistent with SUSY dark matter. Out of time backgrounds that produce fake MET include cosmic rays muons, beam halo muons, HF PMT window hits, HCAL HPD noise and other types of noise. With precise timing cuts, many of these backgrounds can be reduced substantially. However, the trick is also to not affect substantially the signal distributions of MET with such cuts, so the study will include running against MET distributions produced by SM and SUSY physics processes, and perhaps to develop timing of objects that are higher level than rechits, such as "CaloTowers" and jets, if necessary.

A couple motivation plots from a brief study done for my Torino talk. Two CRAFT runs were selected and filtered for L1 trigger bits; one with a single muon trigger, and the other with an "egamma" HPD noise trigger. Several timing window constraints were tested and are shown.

  • Run 67818, egamma trigger on HPD noise:

Study Components

Timing and Synchronization

Timing Paper

-- PhilDudero - 27 Apr 2009

Topic attachments
I Attachment History Action Size Date Who Comment
PDFpdf 090521_HcalMCtimeSmearing.pdf r1 manage 435.0 K 2009-05-21 - 15:24 PhilDudero May 21, 2009 HCAL talk at Simulation Meeting
PNGpng run67818hpd_timesandmet.png r1 manage 27.2 K 2009-04-28 - 00:19 PhilDudero  
PNGpng run68288_hcaltimeanal-mutrig_timesandmet.png r1 manage 24.3 K 2009-04-28 - 00:20 PhilDudero  
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Topic revision: r16 - 2010-11-17 - unknown
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