Two i ssues on resolution
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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

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Two i ssues on resolution

TwoIssues on Resolution

Bertrand, Liwen

Dec.16 ,2010


Two i ssues on resolution

  • 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


Correction on photon energy

Correction on photon energy


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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