Understanding the decay background for measuring fragmentation photons

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Presentation transcript:

Understanding the decay background for measuring fragmentation photons Ali Hanks Group Meeting Sept. 24, 2007 9/24/07

Method Get fragmentation photons directly Use h- conditional yields to select photons correlated with jets Subtract decay background to isolate jet fragmentation photons Tagging method for estimating decay photon background Tag photons from 0's and 's directly Estimate tagging efficiency as a function of the h-  Include contribution from other decays using the  distribution 9/24/07

Two Major Issues False tagged background subtraction for 0's and 's Two possible methods: Event mixing, resonance busting Two sources of background: uncorrelated combinatoric pairs real jet correlations Use PYTHIA to understand the limitations of both methods Estimating the tagging efficiency Using fastmc: throw p0's associated with "trigger" hadron using input pT and  distributions from data Doesn't show same pT trend in efficiency as seen in data Use PISA to understand detector effects that the fastmc is missing 9/24/07

Resonance busting Reminder of background trend in data: 9/24/07

Resonance busting in PYTHIA 9/24/07

Minbias event mixing Includes sector cut in mixed, without it mixed is above data at all pT 9/24/07

Minbias event mixing 9/24/07

Minbias event mixing in the data In the data we can see a similar trend 9/24/07

Understanding the fastmc Thus far the fastmc has shown a strong pT dependence not seen in the data Some of this could be real due to the pT dependent /0 ratio when requiring a hadron trigger in the event (shouldn't be this large?) Important to understand any possible detector effects Using PISA we can do the same thing: Efficiency defined as Compare this to what we see in the fastmc 9/24/07

Understanding the fastmc Reminder: data vs fastmc (where data is ratio of tag to inc) 9/24/07

Understanding the fastmc PISA vs fastmc 9/24/07

Understanding fastmc vs PISA PT dependence of photon quality cuts: compare all photon clusters to simulated photon clusters that get detected and pass our quality cuts 1st: standard pc3 cuts: dphi>0.01 and dz>7 2nd: hard pc3 cuts: dphi>0.03 and dz>20 9/24/07

Understanding the fastmc PISA vs fastmc including single photon efficiency in fastmc 9/24/07

9/24/07