Difference: EWK-10-008 (2 vs. 3)

Revision 32011-04-07 - veverka

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META TOPICPARENT name="Papers2011"

EWK-10-008 Observation of W-gamma and Z-gamma final states

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Important links and documents

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Abstract

We present the first measurement of Wγ and Zγ production in proton proton collisions at √s = 7 TeV, based on 36.1 pb−1 of data recorded at the LHC by the CMS detector. The electron and muon decay channels of the W and Z are used. We measure the cross sections for the photon transverse energy ETγ > 10 GeV and spatial separation from charged leptons ΔR(μ, γ) > 0.7. We find σ(pp → Wγ + X) × B(W → lν) = 55.9 ± 5.0 (stat.) ± 5.0 (syst.) ± 6.1 (lumi.) pb and σ(pp → Zγ + X) × B(Z → ll) = 9.3 ± 1.0 (stat.) ± 0.6 (syst.) ± 1.0 (lumi.) pb, in agreement with standard model predictions. We also set the first limits on anomalous WWγ, ZZγ, and Zγγ trilinear gauge couplings at √s = 7 TeV.

Main Caltech Contributions

Results

  • 2D aTGC limits:
    fig6_aTGC_limits.png

  • 1D aTGC limits:
    table3_aTGC_limits.png

  • Wgamma photon Et spectrum:
    fig2_phoEt_aTGC.png

  • Zgamma photon Et spectrum:
    fig3_phoEt_aTGC_Z.png

  • Radiation Amplitude Zero:
    fig4_raz.png

  • Wgamma cross-section systematics:
    table1_Wsystematics.png
 
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  • Zgamma cross-section systematics:
    table2_Zsystematics.png

  • m(llg) versus m(ll):
    fig5_m2_vs_m3.png

  • Data-driven background estimate:
    fig1_photonEt.png

Important links and documents

 
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  • CWR End: March 25
  • As of March 6, responding to CWR comments before the Final Reading
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Main Caltech Contributions

-- Main.veverka - 2011-04-06
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>		 -- Main.veverka - 2011-04-07

META FILEATTACHMENT attachment="fig1_photonEt.png" attr="" comment="Data-driven background estimate" date="1302205858" name="fig1_photonEt.png" path="fig1_photonEt.png" size="68958" user="veverka" version="1"
META FILEATTACHMENT attachment="fig2_phoEt_aTGC.png" attr="" comment="Wgamma photon Et spectrum" date="1302206007" name="fig2_phoEt_aTGC.png" path="fig2_phoEt_aTGC.png" size="85348" user="veverka" version="1"
META FILEATTACHMENT attachment="fig3_phoEt_aTGC_Z.png" attr="" comment="Zgamma photon Et spectrum" date="1302206047" name="fig3_phoEt_aTGC_Z.png" path="fig3_phoEt_aTGC_Z.png" size="73123" user="veverka" version="1"
META FILEATTACHMENT attachment="fig4_raz.png" attr="" comment="Radiation Amplitude Zero" date="1302206085" name="fig4_raz.png" path="fig4_raz.png" size="62442" user="veverka" version="1"
META FILEATTACHMENT attachment="fig5_m2_vs_m3.png" attr="" comment="m(llg) versus m(ll)" date="1302206127" name="fig5_m2_vs_m3.png" path="fig5_m2_vs_m3.png" size="139054" user="veverka" version="1"
META FILEATTACHMENT attachment="fig6_aTGC_limits.png" attr="" comment="2D aTGC limits" date="1302206166" name="fig6_aTGC_limits.png" path="fig6_aTGC_limits.png" size="59009" user="veverka" version="1"
META FILEATTACHMENT attachment="table1_Wsystematics.png" attr="" comment="Wgamma cross-section systematics" date="1302206256" name="table1_Wsystematics.png" path="table1_Wsystematics.png" size="80757" user="veverka" version="1"
META FILEATTACHMENT attachment="table2_Zsystematics.png" attr="" comment="Zgamma cross-section systematics" date="1302206300" name="table2_Zsystematics.png" path="table2_Zsystematics.png" size="59160" user="veverka" version="1"
META FILEATTACHMENT attachment="table3_aTGC_limits.png" attr="" comment="1D aTGC limits" date="1302206330" name="table3_aTGC_limits.png" path="table3_aTGC_limits.png" size="24654" user="veverka" version="1"
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