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Sketch of g/h discrimination in the Endcap
Updated on Wed, 2008-03-19 21:58. Originally created by balewski on 2008-03-19 21:22.List of key variables
EEmc Gammas via conversion method, chi2 comparison
Updated on Thu, 2008-03-20 11:26. Originally created by jwebb on 2008-03-19 14:22.EEmc Gammas via conversion method, chi2 comparison
Abstract: Using the conversion method discussed previously, we examine shower-shape variables in greater detail. Specifically, we compare χ2/ndf distributions using shower-shapes derived from MC and from identified η decays.
SMD QA Plots
Updated on Tue, 2008-03-18 14:58. Originally created by wleight on 2008-03-18 14:53.These plots were made from the 5000-event muon, photon, and piminus samples by running the tower clustering algorithm (with a seed threshold of 1 GeV and a cluster threshold for 4 GeV for photons a
links - tests
Updated on Tue, 2008-05-13 16:42. Originally created by chajecki on 2008-03-17 16:42.Update to Jet Study
Updated on Thu, 2008-03-13 08:21. Originally created by mattheww on 2008-03-13 08:21.I have updated some of the plots for the jet energy study I conducted. The following plots show the effect of a single type of particle on the jet energy we find.
EEmc Gammas via conversion method
Updated on Tue, 2008-03-25 15:54. Originally created by jwebb on 2008-03-11 15:04.
Abstract:
We use the preshower subsytem to statistically extract single-photon yields in the EEmc. The method is similar to that employed by CDF [1]. An isolated sample of photon candidates is identified above pT > 5.0 GeV in the endcap. Gamma candidates with charged particles within R < 0.3 are vetoed using the 1st preshower layer. The remaining candidates should be primarily composed of neutral particles. Based on the differential probabilities for 1 versus 2 photons to convert in the first radiator and deposit energy in preshower-2, it is then possible to extract a photon yield.
What follows is a "proof-of-principle" analysis. The biggest "trick" is determining the conversion probabilities for the signal and background events, and this will need to be investigated further to quantify systematic uncertainties.
Frank's Jet Blog
Updated on Tue, 2008-03-11 14:27. Originally created by fsimon on 2008-03-11 14:27.Inspired by Matt Walkers study I have started a Geant4 investigation of the BEMC response to various particles. A very first look is shown in the attached pdf file.
PID Background Systematic
Documentation for a systematic uncertainty in the Run 5 charged pion A_{LL} based on contamination from non-pions in the PID selection window.