Proposal for ATGC limit

Zhijun Liang

Proposal for ATGC limit

04/21/23

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Fiducial cross section

- Pt(lep)>25 GeV - |eta(lep)| < 2.47 - MET > 25 GeV - MT > 40 GeV - Et(pho) > 15 GeV - dR(pho,lep)>0.7 - |eta(pho)| < 2.37

- Pt(lep1)>25 GeV - |eta(lep)| < 2.47 - MET > 25 GeV - MT > 40 GeV - Et(pho) > 15 GeV - dR(pho,lep)>0.7 - |eta(pho)| < 2.37 - Njet==0

- Pt(lep1)>25 GeV - |eta(lep)| < 2.47 - MET > 25 GeV - MT > 40 GeV - Et(pho) > 45 GeV - dR(pho,lep)>0.7 - |eta(pho)| < 2.37

Inclusive phase space Low pt zero jet phase space

High pT inclusive phase space

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pT(g)>15GeVInclusive phase space

alpgen sherpa

C_W 41.70% 36.6%

alpha 91.2% 87.1%

Eff_lep 74.77%+-1.14%

76.7%+-1.1%

recon +-0.7% 0.7%

trigger 97.98%+-0.446%

98.17%+-0.44%

Photon ID 65.36%+-4.85%

58.4%+-6.03%

Photon isolation

95.7%+-1% 95.58%+-1%

A 75.37%+-2% 77.04%Number of extracted signal : 1334Measured Fiducial cross section : 4.2 +-0.3 pb

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pT(g)>15GeVonly zero jet event

alpgen sherpa

C_W 40.8% 38.0%

alpha 79.7% 75.84%

Eff_lep 77.1%+-1.2% 77.7%+-1.2%

recon +-0.7% +-0.7%

trigger 98.1%+-0.44% 98.3%+-0.44%

Photon ID 70.1+-6.4% 68.8+-7.6%

Photon isolation

96.6%+-1.1% 95.5+-1.1%

A 78.25% 77.7%

Number of extracted signal : 815Measured Fiducial cross section : 2.5 +-0.2 pb

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pT(g)>45GeVInclusive phase space

alpgen sherpa

C_W 63.5% 51.8%

alpha 1.09 1.03

Eff_lep 80.1+-0.8% 79.2%+-0.8%

recon +-0.7% +-0.7%

trigger 97.0+-0.6% 97.9+-0.5%

Photon ID 81.6%+-1.1% 71.1+-1.1%

Photon isolation

91.9%+-0.7% 91.2%+-0.7%

A 76.0% 76.6%Number of extracted signal : 237Measured Fiducial cross section : 0.53 +-0.03 pb

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ATGC limit based on fiducial cross section

http://cdsweb.cern.ch/record/1375854/files/ATL-COM-PHYS-2011-1108.pdf

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Proposal to use fiducial cross section

Just to use one bin(fiducial cross section) instead of based on photon pT .

WW group have not converged on how to estimate signal shape uncertainty , maybe it is better to extract ATGC limit by using fiducial cross section for now.

Make use of High pT inclusive phase space to extract ATGC limit.

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λ 0 0.02 0.04 0.06 0.08 0.1 0.12 0.14 0.16 0.18 0.2

W+g0.267

8 0.283 0.291 0.314 0.334 0.364 0.392 0.422 0.478 0.518 0.574W-g 0.188 0.194 0.197 0.203 0.217 0.231 0.24 0.259 0.281 0.299 0.333

Total0.455

8 0.477 0.488 0.517 0.551 0.595 0.632 0.681 0.759 0.817 0.907

δκ 0 0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4 0.45 0.5 0.55 0.6 0.65 0.7W+g 0.2678 0.274 0.282 0.286 0.29 0.294 0.308 0.317 0.328 0.340.348 0.365 0.38 0.398 0.408W-g 0.188 0.189 0.191 0.194 0.198 0.201 0.205 0.214 0.216 0.2210.232 0.239 0.248 0.259 0.268Total 0.4558 0.463 0.473 0.48 0.488 0.495 0.513 0.531 0.544 0.561 0.58 0.604 0.628 0.657 0.676

δκ 0 -0.05 -0.1 -0.15 -0.2 -0.25 -0.3 -0.35 -0.4 -0.45 -0.5 -0.55 -0.6 -0.65 -0.7 -0.75 -0.8W+g 0.2678 0.268 0.269 0.274 0.276 0.28 0.282 0.289 0.298 0.309 0.323 0.332 0.347 0.354 0.371 0.391 0.412W-g 0.188 0.189 0.1893 0.19 0.196 0.197 0.199 0.202 0.205 0.212 0.217 0.226 0.231 0.241 0.248 0.258 0.266Total 0.4558 0.457 0.4583 0.464 0.472 0.477 0.481 0.491 0.503 0.521 0.54 0.558 0.578 0.595 0.619 0.649 0.678

Expected Wgamma cross sectionwith different ATGC parameter (Baur

NLO)

Expected Wgamma cross section VS ATGC parameter (pb)

Expected Wgamma cross section VS ATGC parameter (pb)

Expected Wgamma cross section VS ATGC parameter (pb)

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λ dependence

Predicted cross section(pb)

λ

- Pt(lep1)>25 GeV - |eta(lep)| < 2.47 - MET > 25 GeV - MT > 40 GeV - Et(pho) > 45 GeV - dR(pho,lep)>0.7 - |eta(pho)| < 2.37

High pT inclusive phase space

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ATGC limit

P(measured cross section| λ)

95% CL

λ

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Δκ dependence

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ATGC limit for Δκ

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