BasicTriggerRates-LawrenceBerkeleyNationalLaboratory基本的触发率-劳伦斯伯克利国家实验室.ppt

1、Basic Trigger Rates,December 3, 2004,2,References,Physics and Detector Performance TDR http:/www.cern.ch/Atlas/GROUPS/PHYSICS/TDR/physics_tdr/printout/Volume_I.pdf http:/www.cern.ch/Atlas/GROUPS/PHYSICS/TDR/physics_tdr/printout/Volume_II.pdf High Level Trigger. TDR http:/atlas-proj-hltdaqdcs-tdr.web

2、.cern.ch/atlas-proj-hltdaqdcs-tdr/ Level 1 Trigger TDR http:/atlasinfo.cern.ch/Atlas/GROUPS/DAQTRIG/TDR/V1REV1/L1TDR_all.pdf Comparison of ATLAS and CMS Trigger Rates http:/agenda.cern.ch/askArchive.php?base=agenda XX gives the threshold in transverse energy (in units of GeV); N the number of object

3、s; and i indicates an isolation requirement. As an example, 220i refers to the requirement of two muons, with a pT threshold of 20 GeV each, fulfilling isolation criteria. The thresholds indicate the true value above which the selection has good efficiency. The exact value for the efficiency obtaine

4、d depends on the implementation of the algorithm and the details of the criteria applied. Note that there is a different, but similar, nomenclature for the LVL1 trigger objects.,11,12,Efficiency Example,13,Single Electrons/Photons LVL1,The rate of the LVL1 electron/photon triggers is dominated by mi

5、sidentified jets.,The ET-threshold scale in the plot is defined so that the efficiency for selecting genuine electrons with transverse energy equal to the quoted value is 95%.,14,Electron/photon pairs LVL1,15,Getting HLT Rate,From HLT TDR,Update this year e25i Fraction of final rate,16,Muons,17,Muon

6、 Cross Sections,18,19,Jets,20,More Jets,21,Jet Rates,22,Missing ET + 1 jet,23,SUSY Example,Ongoing studies of full simulation of SUSY events in “co-annihilation region”. See recent talks by Pavel http:/agenda.cern.ch/askArchive.php?base=agenda&categ=a045055&id=a045055s1t1%2Ftransparencies%2FNovember

7、_18.ppt Or Davide http:/agenda.cern.ch/askArchive.php?base=agenda&categ=a044275&id=a044275s6t8/transparencies Soft leptons see next page Desire to trigger on these events with missing ET+1jet trigger,24,Lepton Spectra,pT distribution for leading and soft electrons that are used to calculate dilepton

8、 invariant mass.,pT distribution for leading and soft muons that are used to calculate dilepton invariant mass.,leading e soft e,leading muon soft muon,pT for leading and soft electrons,pT for leading and soft muons,25,SUSY Example,j70 + xE70,j400, 3j165, 4j110,26,Possible Future Topics?,Trigger algorithms for specific objects eg. what is an electron Just reading but educational Straightforward to do from various TDRs and presentations Cross sections and simple spectra (ds/dET) Many piece