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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

TwoIssues on Resolution

Bertrand, Liwen

Dec.16 ,2010


  • Someproblem of fitting invariant mass still exists

  • Some results on special mc production with single photons


Selection of photon candidates
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



Comparison of invariant mass reslution
Comparison of invariant mass reslution

The default one after smearing

are not fitted well


Comparison of invariant mass reslution1
Comparison of invariant mass reslution

  • Divided into three cases:

    unconverted photon + unconverted photon

    unconverted photon + converted photon

    converted photon + converted photon


Unconverted photon unconverted photon
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


Unconverted photon converted photon
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


Converted photon converted photon
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


Some results on special mc production with single photons
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


De distribution after some correction
dE distribution after some correction

dE=Erec - Etruth

(fixed eta=0.3 and E=59.5GeV)


Correlation among id variables
Correlation among ID variables

eta=0.3 E = 59.5GeV

eta=1.7 E = 60 GeV


Next to do
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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