Difference between revisions of "Mattione Update 11302011"
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| + | == DC dE/dx Study Overview == | ||
| + | |||
| + | === Introduction === | ||
| + | * DC dE/dx information used for PID is bad, is disabled until fixed. | ||
| + | ** DC dE/dx Confidence Level (for protons, similar for K+'s, π<sup>+</sup>'s, and π<sup>-</sup>). | ||
| + | [[Image:Mattione_Update_11162011_DCdEdxConfidenceLevel.gif|thumb|left|600px|protons]] | ||
| + | <br style="clear:both;"/> | ||
| + | |||
| + | === Procedure === | ||
| + | * Look at reconstructed dE/dx in CDC & FDC (treated separately: different gas mixtures). | ||
| + | ** Half of the track hits in each of the FDC/CDC (those with the largest dE/dx) are ignored: truncates Landau distribution to resemble Gaussian distribution. | ||
| + | * Fit mean and σ of these distributions and use them in calculation of χ<sup>2</sup> | ||
| + | |||
== FDC == | == FDC == | ||
* FDC π<sup>+</sup> dE/dx μ & σ | * FDC π<sup>+</sup> dE/dx μ & σ | ||
| Line 30: | Line 43: | ||
== CDC Proton Confidence Levels == | == CDC Proton Confidence Levels == | ||
| − | * | + | * Confidence Level of all protons with # CDC hits >= 6 (# used hits > 3) |
[[Image:Mattione_Update_11302011_ConfidenceLevel_CDCProton.gif|thumb|left|600px|CDC, protons, # CDC hits >= 6]] | [[Image:Mattione_Update_11302011_ConfidenceLevel_CDCProton.gif|thumb|left|600px|CDC, protons, # CDC hits >= 6]] | ||
<br style="clear:both;"/> | <br style="clear:both;"/> | ||
| + | |||
| + | * Confidence Level of protons with varying # of CDC hits used | ||
| + | {| class="wikitable" | ||
| + | | [[Image:Mattione_Update_11302011_ConfidenceLevel_CDCProtonBin1.gif|thumb|left|600px|CDC, protons, # Hits Used = 4]] | ||
| + | | [[Image:Mattione_Update_11302011_ConfidenceLevel_CDCProtonBin2.gif|thumb|left|600px|CDC, protons, # Hits Used = 6]] | ||
| + | |- | ||
| + | | [[Image:Mattione_Update_11302011_ConfidenceLevel_CDCProtonBin3.gif|thumb|left|600px|CDC, protons, # Hits Used = 8]] | ||
| + | | [[Image:Mattione_Update_11302011_ConfidenceLevel_CDCProtonBin4.gif|thumb|left|600px|CDC, protons, # Hits Used = 10]] | ||
| + | |- | ||
| + | | [[Image:Mattione_Update_11302011_ConfidenceLevel_CDCProtonBin5.gif|thumb|left|600px|CDC, protons, # Hits Used = 12]] | ||
| + | | [[Image:Mattione_Update_11302011_ConfidenceLevel_CDCProtonBin6.gif|thumb|left|600px|CDC, protons, # Hits Used = 14]] | ||
| + | |} | ||
Revision as of 14:04, 30 November 2011
Contents
DC dE/dx Study Overview
Introduction
- DC dE/dx information used for PID is bad, is disabled until fixed.
- DC dE/dx Confidence Level (for protons, similar for K+'s, π+'s, and π-).
Procedure
- Look at reconstructed dE/dx in CDC & FDC (treated separately: different gas mixtures).
- Half of the track hits in each of the FDC/CDC (those with the largest dE/dx) are ignored: truncates Landau distribution to resemble Gaussian distribution.
- Fit mean and σ of these distributions and use them in calculation of χ2
FDC
- FDC π+ dE/dx μ & σ
- σ is dependent on amount of information: # hits USED (= 1/2 of total # hits: reject largest dE/dx hits to remove Landau tail)
- FDC protons dE/dx μ & σ
- σ is dependent on amount of information: # hits USED (= 1/2 of total # hits: reject largest dE/dx hits to remove Landau tail)
CDC
- CDC π+ dE/dx μ & σ
- σ is dependent on amount of information: # hits USED (= 1/2 of total # hits: reject largest dE/dx hits to remove Landau tail)
- CDC protons dE/dx μ & σ
- σ is dependent on amount of information: # hits USED (= 1/2 of total # hits: reject largest dE/dx hits to remove Landau tail)
CDC Proton Confidence Levels
- Confidence Level of all protons with # CDC hits >= 6 (# used hits > 3)
- Confidence Level of protons with varying # of CDC hits used
