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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.
 
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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.

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PID Background Systematic

Updated on Sun, 2008-07-27 23:45. Originally created by kocolosk on 2008-03-10 14:19.

 

Documentation for a systematic uncertainty in the Run 5 charged pion A_{LL} based on contamination from non-pions in the PID selection window.

Migration to Drupal 6.1

Updated on Sun, 2009-04-26 16:51 by testadmin. Originally created by chajecki on 2008-03-10 13:09.
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Relative Luminosity Systematic

Updated on Sun, 2008-07-27 23:46. Originally created by kocolosk on 2008-03-10 11:20.

 

Documentation for a systematic uncertainty introduced in the Run 5 charged pion A_{LL} based on uncertainties in our measurement of the relative luminosity.

EMCICs in spectra

Updated on Mon, 2008-03-24 02:18. Originally created by chajecki on 2008-03-09 22:13.

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Extension of "blog" module

Updated on Sun, 2008-03-23 21:38. Originally created by chajecki on 2008-03-09 17:34.

 

Module proposal : extension of "blog" module

 Module name : blog_addons

List of features:

1. Front page of a blog module.

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SSA by pT

Updated on Tue, 2008-03-11 11:16. Originally created by kocolosk on 2008-03-07 15:44.

Here’s a summary of results for null-test calculations of single-spin asymmetries for the Run 5 charged pion A_{LL} analysis plotted versus pT. Asymmetries are defined as (Y,B):

Yellow Beam: -1 x { (++ + +-) - (-+ + —) }
Blue Beam: -1 x { (++ + -+) - (+- + —) }
Like-Sign: (++) - (—)
Unlike-Sign: (+-) - (-+)

All the asymmetries incorporate final beam polarizations.

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First Physics Cuts

Updated on Thu, 2008-03-06 13:55. Originally created by wleight on 2008-03-06 13:55.

These plots were made from 5000 each of mu, pi-, and gamma single-particle events with eta distribution from -.2 to 1.2 and pt distribution from 5 to 40 GeV.  Tower clustering was done using a

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SSA by Fill

Updated on Tue, 2008-03-11 11:16. Originally created by kocolosk on 2008-03-05 17:32.

Here’s a summary of results for null-test calculations of single-spin asymmetries for the Run 5 charged pion A_{LL} analysis. Asymmetries are defined as (Y,B):

Yellow Beam: -1 x { (++ + +-) - (-+ + —) }
Blue Beam: -1 x { (++ + -+) - (+- + —) }
Like-Sign: (++) - (—)
Unlike-Sign: (+-) - (-+)

All the asymmetries incorporate final beam polarizations.

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