Categories for resolution studyCategories : eta , energy , number of primary vertices , conversion should be considered

Eta : barrel – endcap ? or 4 bins like [0, 0.6] , [0.6, 1.37] , [1.52, 1.81] , [1.81, 2.37] ?

Energy : how to define the energy bins ?

Fraction of eta division

Leading[0, 0.6 ]

Leading[0.6, 1.37]

Leading[1.52, 1.81]

Leading[1.81, 2.37]

subleading[0, 0.6 ]

16.36% 16.74% 3.17% 2.51%

subleading[0.6, 1.37 ]

17.61% 16.00% 3.07% 3.85%

subleading[1.52, 1.81 ]

3.27% 3.42% 1.04% 1.54%

subleading[1.81, 2.37 ]

3.31% 4.44% 1.32% 2.23%

Di-photon, tagging as leading and sub-leading

LeadingIn barrel

LeadingIn endcap

Subleading in barrel

66.71% 12.60%

SubleadingIn endcap

14.44% 6.13%

If upper limit of the new MC is around 1,000,000. barrel – endcap division might be a better choice

Also, do we need to tag two photons as leading and subleading in eta category ?

4 eta bins -- [0, 0.6] , [0.6, 1.37] , [1.52, 1.81] , [1.81, 2.37]

barrel / endcap

conversion possibility in each eta bin

[0, 0.6] [0.6, 1.37] [1.52, 1.81] [1.81,2.37]

Unconverted 76.75% 62.52% 53.08% 51.89%

converted 23.25% 37.48% 46.92% 48.11%

Leading photon :

subleading photon :

[0, 0.6] [0.6, 1.37] [1.52, 1.81] [1.81,2.37]

Unconverted 75.68% 63.87% 52.11% 51.29%

converted 24.32% 36.13% 47.89% 48.71%

Conversion for leading and subleading photon are more or less the same

Glance on the resolution at different categories

Resolution parameter comparison categorized by eta

CBsigma CBmean CBalpha CBfrac CBn GAmean GAsigmaB + B * 1.429 119.9 1.232 0.9684 9.847 121.1 4.107B + E 1.483 119.7 1.283 0.7773 4.138 119.3 3.88E + B 1.435 119.7 1.067 0.8399 8.661 120.4 4.411E + E 1.321 119.7 0.9687 0.6775 50.0 119.8 4.51

B + B means: leading photon in barrel and subleading photon in barrel

CBsigma CBmean CBalpha CBfrac CBn GAmean GAsigma

B + B * 1.651 119.9 1.335 0.9631 11.25 121.8 4.36

B + E 1.88 119.7 2.465 0.73 2.723 119.1 4.059

E + B 1.957 119.6 1.441 0.8656 18.07 120.4 4.861

E + E 1.998 119.5 1.608 0.739 40.93 120.4 4.651

Without smearing :

With smearing :

Resolution parameter comparison categorized by E (1)

High E : E of leading Photon > 68 GeV , E of subleading Photon > 68 GeV

Low E : E of leading Photon < 68 GeV , E of subleading Photon < 68 GeV

smeared

smeared

High E High E

low E low E

both of the two photons are in barrel

Resolution parameter comparison categorized by E (2)both of the two photons are in barrel and unconverted

High E High E

low E low E

smeared

smeared

High E : E of leading Photon > 68 GeV , E of subleading Photon > 68 GeV

Low E : E of leading Photon < 68 GeV , E of subleading Photon < 68 GeV

next

1. Decide the categories of eta and energy ;2. Any other category should be considered ? 3. Estimate the size of new MC asap

Back up

Resolution parameter comparison categorized by eta (2)

Endcap + endcap is not precise enough

smeared