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Two I ssues on Resolution

Two I ssues on Resolution. Bertrand, Liwen Dec.16 ,2010. S ome problem of fitting invariant mass still exists Some results on special mc production with single photons. Selection of photon candidates. ph_pt (leading ) > 40 GeV , ph_pt (sub-leading ) > 25 GeV Robust tight photons

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Two I ssues on Resolution

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  1. TwoIssues on Resolution Bertrand, Liwen Dec.16 ,2010

  2. Someproblem of fitting invariant mass still exists • Some results on special mc production with single photons

  3. Selection of photon candidates • ph_pt (leading) > 40 GeV, • ph_pt (sub-leading) > 25 GeV • Robust tight photons • (for both leading and subleading photon) • ph_trackIsol < 4 GeV • (for both leading and subleading photon) • ph_EtCone40_corrected < 3GeV Use: mc09_7TeV.106384.PythiaH120gamgam.merge.AOD.e505_s765_s767_r1430_r1429

  4. Correction on photon energy

  5. Comparison of invariant mass reslution The default one after smearing are not fitted well

  6. Comparison of invariant mass reslution • Divided into three cases: unconverted photon + unconverted photon unconverted photon + converted photon converted photon + converted photon

  7. unconverted photon + unconverted photon The plots of unconverted + unconverted before smearing is not well fitted Double guassian With smearing frac : the ratio of crystal ball Alpha, cbmean, cbsigma, n : parameters of crystal ball Sigmean, sigwidth : parameters of gaussin

  8. unconverted photon + converted photon With smearing frac : the ratio of crystal ball Alpha, cbmean, cbsigma, n : parameters of crystal ball Sigmean, sigwidth : parameters of gaussin

  9. converted photon + converted photon With smearing frac : the ratio of crystal ball Alpha, cbmean, cbsigma, n : parameters of crystal ball Sigmean, sigwidth : parameters of gaussin

  10. Some results on special mc production with single photons MC: mc10_7TeV.107549.singlepart_gamma_E59p5_eta0p3.recon.AOD.e643_s933_s946_r1657 mc10_7TeV.107581.singlepart_gamma_E60p0_eta1p7.merge.AOD.e643_s933_s946_r1657_r1700

  11. dE distribution after some correction dE=Erec - Etruth (fixed eta=0.3 and E=59.5GeV)

  12. Correlation among ID variables eta=0.3 E = 59.5GeV eta=1.7 E = 60 GeV

  13. Next to do • Correlation among ID variables • Define new ID variables • Work on more ready MC(fixed eta and E at different value) • dE = dE(E,eta,Xi) Better energy resolution  better invmass resolution

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