(Single Arm) Pair Production Cross Section at PrimEx Status Report

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Presentation transcript:

(Single Arm) Pair Production Cross Section at PrimEx Status Report Aram Teymurazyan University of Kentucky February 24, 2007 PrimEx Collaboration Meeting

Outline Event pre-selection Cuts Theoretical calculations Experimental results Summary

Pair Production in PrimEx Measured Quantities Energy of the incident photon Energies of each lepton Positions of each lepton

Event Sample Selection Trigger – HyCal_Total_Sum.Tagger_MOR Production phase only Miscellaneous checks: At least 1 reconstructed photon 1 or more clusters in HyCal EVENTID bank present At least 1 photon associated with trigger

Pair Production Events

Applied Cuts 1) 2) 3) 4) 5) Energy - Momentum conservation is not used in current analysis

Pair Production Events

Experimental Results

Experimental Reults

Experimental Results

Experimental Results

Summary Measurement of pair production absolute cross section is a check of the absolute photon flux normalization. Analysis is ongoing. Agreement with theory at the level of ~3.8 % Work in progress to reduce the systematic errors to 1 – 2 % level

Applied Cuts – Efficiencies

State of the Art Calculation of e+e- Cross–Section Considering PrimEx Resolutions Calculation by Alexandr Korchin: Bethe-Heitler mechanism of pair production on the nucleus with screening effects due to atomic electrons and Coulomb distortion Pair production on atomic electrons considering excitation of all atomic states and correlation effects due to presence of other electrons and the nucleus Radiative corrections (of order ) i) virtual-photon loops and ii) real-photon process like  + →e+ + e- +  +  Nuclear incoherent contribution  + p →e+ + e- + p Nuclear coherent contribution (VCS)  + →* + →e+ + e- + 

State of the Art Calculation of e+e- Cross–Section Considering PrimEx Resolutions Calculation by Alexandr Korchin 12C NIST values for σtotal: 351.8 mb @ 5.0 GeV and 352.0 mb @ 5.5 GeV

p0 gains Snake gains

p0 gains Snake gains

p0 gains Snake gains

p0 gains Snake gains

Systematic Error Estimation Experimental Results Systematic Error Estimation Photon Flux 2-3% Target Thickness 0.06% Background Estimation 0.5% Calibrations Total ~3.7%

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