MC Study of e ZH(ZZ*) process - Linear Collider
Transcript of MC Study of e ZH(ZZ*) process - Linear Collider
MC Study of e+eโโถZH(ZZ*) process
Status reportAntonov Evgeny (LPI, MEPhI), Drutskoy Alexey (LPI, MEPhI)
18 November 2020
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Descriptions
We use following notations for convenience:
e+eโโถZH(ZZ*)
Zpr(or Zprime) Zh Z*(or Zstar)
Quantiles: [0.05, 0.16, 0.5, 0.84, 0.95]
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Additional analysis. Jet finder
Need to choose the optimal set of parameters corresponding to minimum of the function for each reconstructed particle.
[QL, Q1, Qmid, Q3, QR]
๐ผ๐๐ 34 = (๐3 โ ๐1)/2
๐๐๐๐ = ๐๐๐๐๐ โ๐๐๐
๐๐๐๐ ๐ โ๐๐ข๐๐ ๐๐ > ๐๐ฟ ๐๐๐ < ๐๐ , ๐กโ๐๐
๐ ๐๐90 =โ๐๐๐๐ 2
๐๐๐๐ก๐๐๐๐ 2โ
โ๐๐๐๐
๐๐๐๐ก๐๐๐๐
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Z Mass differences. Zpr->qq, Z->qq, Z*->ll
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๐ด ๐๐๐ โ๐ด(๐๐๐๐ด๐ช)
R = [0.1, 3.0]
๐ด ๐๐ โ๐ด(๐๐๐ด๐ช)
R = [0.1, 3.0]
Z Mass differences. Zpr->qq, Z->ll, Z*->qq
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๐ด(๐๐๐) โ๐ด(๐๐๐๐ด๐ช)
R = [0.1, 3.0]
๐ด(๐โ) โ๐ด(๐โ๐ด๐ช)
R = [0.1, 3.0]
Median. Zpr->qq, Z->qq, Z*->ll
8Finally we took this parameters: R=1.3, Beta=1.0, Gamma=0.1 for
signal and WWg background
Signal: Event selection for Zpr->qq, Z->qq, Z*->ll
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๐๐๐๐๐๐๐. ๐๐ช๐ช๐ก_๐ณ๐ณ
Initial: qqH_ZZ events - 10000 evt
Next: Selection of qqH_Z(qq)Z*(ll) events: 502 evt (5.0%) remainIsoLepTag: 502 evt without YokeIsoLepSelection (Selection of events with correct number of leptons): 360 evt (72.7%) remainCuts: 222 evt (61.7%) remained after cuts and weight:Exclude Z*Z* MC level (M Z* < 45 GeV, M Zh > 82 GeV): -103M Zh mass >70 GeV: -51Total 360-103-51 = 206 evtPol [-0.8, 0.3] = Nint(1.08x206) = 222 evt
Final number of events โ 222 evt
Background: Event selection for ๐พ+๐พโฮณ
Initial: Z(mumu)H events - 20000 evt
IsoLepTag: 20000 evt without YokeIsoLepSelection (Selection of events with correct number of leptons): 2749 evt (13.7%) remain
Cuts: 237 evt (8.6%) remained after cuts and weight:M Z* mass > 10 GeV and < 45 GeV: -1318M Zh mass >70 GeV: -386Total 2749 - 1318 - 386 = 1045 evtPol [-0.8, 0.3] = Nint(0.227x1045) = 237 evt
Final number of events โ 237 evt13
๐๐๐๐๐๐๐. ๐๐_๐ฅ๐ฅ๐ฑ๐ฒ๐ฒ๐ฑ
Additional information
Minimum chi square calculation
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ฯ๐๐๐๐ =
(๐๐๐๐ฃ ๐๐๐โ๐๐ ๐๐๐๐๐๐๐)๐
ฯ๐ ๐๐๐๐๐๐๐๐ +
(๐๐๐๐ฃ ๐โโ๐๐ ๐๐๐๐๐๐๐)๐
ฯ๐ ๐๐๐๐๐๐๐๐ +
(๐๐โโ๐๐ ๐๐๐๐๐๐๐)๐
ฯ๐ท๐ ๐๐๐๐๐๐๐๐ +
(๐๐๐๐+๐โโ๐๐ ๐๐๐๐๐๐๐)๐
ฯ๐ท๐ ๐๐๐๐๐๐๐๐ ;
ฯ๐๐๐๐ =
(๐๐๐๐ฃ ๐๐๐โ๐๐ ๐๐๐๐๐๐๐)๐
ฯ๐ ๐๐๐๐๐๐๐๐ +
(๐๐๐๐ฃ ๐โโ๐๐ ๐๐๐๐๐๐๐)๐
ฯ๐ ๐๐๐๐๐๐๐๐ +
(๐๐๐๐โ๐๐ ๐๐๐๐๐๐๐)๐
ฯ๐ท๐ ๐๐๐๐๐๐๐๐ +
(๐๐โ+๐โโ๐๐ ๐๐๐๐๐๐๐)๐
ฯ๐ท๐ ๐๐๐๐๐๐๐๐ ;
We used 6 combinations of minimum chi square with the most energetic jet.
3 for Z prime:
3 for Zh:
ฯ๐ ๐๐๐๐๐๐๐ = ๐ ๐ฎ๐๐ฝ, ฯ๐ท๐ ๐๐๐๐๐๐๐ = ๐ ๐ฎ๐๐ฝ
Zpr->qq, Z->qq, Z*->ll
Zprime and Zh mass distributions
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๐๐๐๐๐๐๐. ๐๐ช๐ช๐ก_๐ณ๐ณ signal
๐ด๐๐๐, ๐๐๐ โ ๐๐ ๐ด๐๐, ๐๐ โ ๐๐
Zpr->qq, Z->qq, Z*->ll
Zstar mass distribution
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๐๐๐๐๐๐๐. ๐๐ช๐ช๐ก_๐ณ๐ณ signal
๐ด๐๐๐๐๐, ๐๐๐๐๐ โ ๐+๐โ
Zpr->qq, Z->qq, Z*->ll
Zprime and Zh+Zstar momentums distributions
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๐๐๐๐๐๐๐. ๐๐ช๐ช๐ก_๐ณ๐ณ signal
๐๐๐๐, ๐๐๐ โ ๐๐ ๐๐๐๐๐๐๐๐, ๐๐ โ ๐๐, ๐๐๐๐๐ โ ๐+๐โ
Zpr->qq, Z->qq, Z*->ll
CHI square distribution
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๐๐๐๐๐๐๐. ๐๐ช๐ช๐ก_๐ณ๐ณ signal
๐ช๐ฏ๐ฐ ๐๐๐๐๐๐, ๐๐๐ โ ๐๐, ๐๐ โ ๐๐
Zpr->qq, Z->qq, Z*->ll
Mass difference distribution
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๐๐๐๐๐๐๐. ๐๐ช๐ช๐ก_๐ณ๐ณ signal
๐๐๐๐๐๐๐. ๐๐_๐ฅ๐ฅ๐ฑ๐ฒ๐ฒ๐ฑ background
Separate
โ๐ = ๐(๐๐๐๐) โ ๐(๐๐) + ๐(๐ ๐๐๐๐๐๐๐)
Mass difference distribution
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โ๐ = ๐(๐๐๐๐) โ ๐(๐๐) + ๐(๐ ๐๐๐๐๐๐๐)
๐๐๐๐๐๐๐. ๐๐ช๐ช๐ก_๐ณ๐ณ signal
๐๐๐๐๐๐๐. ๐๐_๐ฅ๐ฅ๐ฑ๐ฒ๐ฒ๐ฑ background
SUM
Need to optimize procedure
Significance of this channel ~8.5%
Signal: Event selection for Zpr->qq, Z->ll, Z*->qq
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๐๐๐๐๐๐๐. ๐๐ช๐ช๐ก_๐ณ๐ณ
Initial: qqH_ZZ events - 10000 evt
Next: Selection of qqH_Z(qq)Z*(ll) events: 439 evt (4.4%) remainIsoLepTag: 439 evt without YokeIsoLepSelection (Selection of events with correct number of leptons): 408 evt (92.9%) remainCuts: 337 evt (82.6%) remained after cuts and weight:Exclude Z*Z* MC level (M Z* < 45 GeV, M Zh > 82 GeV): -92Total 408-92 = 316 evtPol [-0.8, 0.3] = Nint(1.08x316) = 337 evt
Final number of events โ 337 evt
Additional information
Minimum chi square calculation
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ฯ๐๐๐๐ =
(๐๐๐๐ฃ ๐๐๐โ๐๐ ๐๐๐๐๐๐๐)๐
ฯ๐ ๐๐๐๐๐๐๐๐ +
(๐๐โโ๐๐ ๐๐๐๐๐๐๐)๐
ฯ๐ท๐ ๐๐๐๐๐๐๐๐ +
(๐๐๐๐+๐โโ๐๐ ๐๐๐๐๐๐๐)๐
ฯ๐ท๐ ๐๐๐๐๐๐๐๐ ;
ฯ๐๐๐๐ =
(๐๐๐๐ฃ ๐๐๐โ๐๐ ๐๐๐๐๐๐๐)๐
ฯ๐ ๐๐๐๐๐๐๐๐ +
(๐๐๐๐โ๐๐ ๐๐๐๐๐๐๐)๐
ฯ๐ท๐ ๐๐๐๐๐๐๐๐ +
(๐๐โ+๐โโ๐๐ ๐๐๐๐๐๐๐)๐
ฯ๐ท๐ ๐๐๐๐๐๐๐๐ ;
We used 6 combinations of minimum chi square with the most energetic jet.
3 for Z prime:
3 for Zstar:
Zpr->qq, Z->ll, Z*->qq
Zprime and Zstar mass distributions
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๐๐๐๐๐๐๐. ๐๐ช๐ช๐ก_๐ณ๐ณ signal
๐ด๐๐๐, ๐๐๐ โ ๐๐ ๐ด๐๐๐๐๐, ๐๐๐๐๐ โ ๐๐
Zpr->qq, Z->ll, Z*->qq
Zh mass distribution
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๐๐๐๐๐๐๐. ๐๐ช๐ช๐ก_๐ณ๐ณ signal
๐ด๐๐ ๐๐ โ ๐+๐โ
Zpr->qq, Z->ll, Z*->qq
Zprime and Zh+Zstar momentums distributions
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๐๐๐๐๐๐๐. ๐๐ช๐ช๐ก_๐ณ๐ณ signal
๐๐๐๐, ๐๐๐ โ ๐๐ ๐๐๐๐๐๐๐๐, ๐๐๐๐๐ โ ๐๐, ๐๐ โ ๐+๐โ
Zpr->qq, Z->ll, Z*->qq
CHI square distribution
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๐๐๐๐๐๐๐. ๐๐ช๐ช๐ก_๐ณ๐ณ signal
๐ช๐ฏ๐ฐ ๐๐๐๐๐๐, ๐๐๐ โ ๐๐, ๐๐๐๐๐ โ ๐๐
Zpr->qq, Z->ll, Z*->qq
Higgs boson mass distribution
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๐๐๐๐๐๐๐. ๐๐ช๐ช๐ก_๐ณ๐ณ signal
Need to optimize procedure
CHI square firstly
Signal and background channels. Significance of method
1. ๐๐๐๐๐๐๐ฏ ๐๐โ , ๐๐๐๐๐๐ โ ๐๐
2. ๐๐๐๐๐๐๐ฏ ๐๐โ , ๐๐๐๐๐๐ โ ๐+๐โ/๐+๐โ
3. ๐๐๐๐๐๐๐ฏ ๐๐โ , ๐๐๐๐๐๐ โ ๐ถเดค๐ถ
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In total we have 6 channels
๐ โ ๐๐, ๐โ โ ๐+๐โ/๐+๐โ
๐ โ ๐+๐โ/๐+๐โ, ๐โ โ ๐๐
๐
๐บ๐๐๐= โ(โ
๐
ฯ๐๐ +
๐
ฯ๐๐ +โฏ), ๐๐๐๐๐ ฯ =
ฯ๐ ๐๐๐๐๐๐๐๐๐๐๐๐ต๐๐๐
,
Signal:
Background:๐เดฅ๐ โ ๐๐ ๐+๐โ๐เดฅ๐ - background for channel 3
๐๐๐ธ ๐๐ ๐๐๐ ๐พ๐พ๐ธ ๐๐ - backgroundfor channel 1
Significance of method:
๐บ๐๐๐๐๐๐๐๐๐๐๐ ~ ๐%