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Trigger Cross Section Monitoring at the CMS Experiment

Trigger Cross Section Monitoring at the CMS Experiment. Richard Ruiz 2007 September 13 th University of Chicago. Outline. Motivation for monitoring trigger cross section Trigger Cross Section Monitoring at CDF (XMon) Consumer Client & Fitter Trigger Cross Section Monitoring at CMS (TXMon)

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Trigger Cross Section Monitoring at the CMS Experiment

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  1. Trigger CrossSection Monitoringat the CMS Experiment Richard Ruiz 2007 September 13th University of Chicago

  2. Outline • Motivation for monitoring trigger cross section • Trigger Cross Section Monitoring at CDF (XMon) • Consumer Client & Fitter • Trigger Cross Section Monitoring at CMS (TXMon) • Introduction to XMon at CMS • Implementing XMon Fitter (My Project) • Future Plan for TXMon at CMS Richard Ruiz

  3. Motivation(Why we monitor Trigger Cross Section?) • The probability of a certain reaction can be expressed in terms of physics cross section, σp, a proportionality const. with dimension of area • Ex. At Tevatron Run II, for pp->Z->eeσp ∙ B ~ 270pb (Measured Constant) • Trigger Cross Section, σt, is defined as: • σt = Linst, (Trigger Rate) (Inst. Luminosity) • Ideally triggers contain all signal and no ‘noise’ • σt(Linst) = σp = constant , • However, in practice σt varies as a function of Linst dN dt Richard Ruiz

  4. Motivation con’t • High-Energy Hadron Collider experiments like CDF, DØand CMS need triggers to filter the event data withsubstantial reduction factors • Very large beam crossing frequency: fTev= 2.5MHz (396ns), fLHC=40MHz (25ns) • Large Hadron-Hadron cross section • Not all data can be recorded... But we can ~100Hz • Trigger monitors are important • To ensure only interesting data is being recorded • CDF’s XMon is a working example of a trigger monitor which records and displays σt(Linst) Richard Ruiz

  5. Trigger Cross Section Monitoringat CDF (XMon) • XMon Online Consumer Monitor • XMon Online Consumer Client • Collects trigger and lumi information fromConsumer Server Logger (CSL) • Tabulates, returns trigger status and alarms if necessary • XMon Fitter • Plots and statistically fits tabulated data • Returns .html file with plots and statistical data Richard Ruiz

  6. Implementing Trigger Cross Section Monitoring at CMS • Based on CMS internal note 2007/025, CMShas decided to implement CDF’s XMon at CMS under the name TXMon • TXMon was to be established in two phases • TXMon Fitter (XMon Fitter) • Mostly experimentally independent • TXMon Source & Client (XMon OCC) • Experimentally dependent • Not yet started Richard Ruiz

  7. TXMon Fitter • Same function as XMon • Plot, fit and generate .html files • What makes TXMon different from XMon is that • … runs on both 32-bit AND 64-bit CMSSW Env. • … generalized for n triggers and n trigger levels • … more optional output • … more user friendly (for general usage) Richard Ruiz

  8. TXMon Fitter Examples • Generated by using CDF XMon root files • Identical, minus aesthetic changes, to XMon Fitter Richard Ruiz

  9. Conclusion of Summer • Trigger monitoring system based off of CDF’s XMon is currently worked on and made available for CMS • σt vs. Linst fitting software has already been made andis ready for use from CMS CVS • Future plans include: • TXMon Consumer development will be started soon • Effort to put scalar information in event stream in ongoing • First chance for live test will be Cosmic Run December • LHC slated to go online Mid~Late 2008 Richard Ruiz

  10. A Word of Thanks • Prof. Kim for this opportunity • Ms. Marilyn Smith • Prof. Kaori Maeshima for this project • Dr. Kevin Berkett & Dr. Alan Stone for their help • Dr. Matt Worcester & Prof. David Saltzberg • Oringal CDF XMon developers • Dr. Charles Plager & Dr. Nagesh Kulkarni • Original XMon Fitter developer & current maintainer Richard Ruiz

  11. Richard Ruiz

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