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Compact Muon Solenoid & Implementing XMon Fitter

Compact Muon Solenoid & Implementing XMon Fitter. Richard Ruiz 2007 August 01 st US CMS. What to expect. LHC (The first of many, many acronyms) ‏ CMS Detector: Broken Down Beam, L1T, HLT From detectors to farms: Where does all the data go? Where do I come into the picture?

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Compact Muon Solenoid & Implementing XMon Fitter

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  1. Compact Muon Solenoid &Implementing XMon Fitter Richard Ruiz 2007 August 01st US CMS

  2. What to expect • LHC (The first of many, many acronyms)‏ • CMS Detector: Broken Down • Beam, L1T, HLT • From detectors to farms: Where does all the data go? • Where do I come into the picture? • XMon: XMon & XMon Fitter • Graphs! (I like graphs, do you like graphs?)

  3. What’s wrong with what we have? • Uncertain physical phenomena • Tevatron, KEK, DESY, etc... can’t confirm it • Colliders are producing these events ineffectively • ‘American’ Solution:build something bigger...and better • ‘European’ Solution:RECYCLE

  4. ‘Euro-American’ Solution: • New accelerator,old tunnel • SCC technology in LEP 27km tunnel • 500µm beam • 25ns crossing • 14 TeV pp • 1150 TeV Pb-ion • L = 1033 cm-2s-1 • All before upgrades...

  5. Compact Muon Solenoid • 1 of 6 LHC detectors • LHC-b, ALICE, TOTEM • 1 of 2 ‘General-purpose’ detectors • Works with ATLAS just like CDF and DØ • Analyze γ, L-, L+L-, bb-bar, MET, JET • To search for H, Z’, Z0, and SUSY partlces such as sleptons • Collision Rate ~100MHz • Hardware Rate ~100KHz • Software Rate ~100Hz

  6. An insider’s view of CMS

  7. So how does all this come together?

  8. Then what? • From detectordata is sent to‘StorageManager’ • Distributed to online‘Consumer Monitors’ • Tier 0+1 (CERN)Tier 1(UK) Tier 1(France) Tier 1(Italy) … Tier 1+2 (FNAL)Tier 2 Tier 2 Tier 2 Tier 2 Tier 2 Tier 2 Tier 2 Tier 2

  9. So where do I come in?

  10. Remember those ConsumerMonitors? • Monitor dataquality • Trigger rates,Luminosity,everything! • There is even one that monitors thecross section of a collision! • It’s called Cross Section Monitor (XMon)

  11. Cross Section • … is a measure of the effectivecollision area • Can be used to describe collision run efficiency • Can be calculated as ratio ofCollision Rate (s-1) vs. Luminosity (cm-2s-1) • Physically, cross section is a constant

  12. So is there a problem? • Physically, cross sections are calculated to be constants w.r.t. luminosity • Of course everything is like what we say in theory... • Example:

  13. Online Consumer XMon • A two-part process. • XMon (The first half)‏ • Takes data from Storage Manager • Tabulate data into a specified form • Calculate statistical information • Declare a trigger ‘hot’, ‘cold’ or ‘dead’ • XMon Fitter (The second half)‏ • Plot XMon data points • Statistically fits the data points • Accounts for weighted averages • Re-fits

  14. XMon Fitter Graphs

  15. More Graphs!

  16. My Project • Write XMon (both halves) for CMS • Currently within CDF • Importing • Goals • Write XMon template • Write XMon tailored for CMS

  17. Thank you • Based on CMS internal note 2007/025: “Proposal to Put Luminosity and Trigger Scalar into the CMS Event Stream” • Acknowledgment and Thanks to CDF specifically XMon personnel for their help • Kulkarni, Nagesh "XMonFitter", 2007 July • Special Thanks to: Kevin Burkett, Kaori Maeshima, & Alan Stone,

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