Limits on Anomalous Trilinear Gauge Couplings in Zgamma Events from ppbar Collisions at sqrt{s} = 1.96 TeV

The CDF detector can be described with a coordinate system consisting of r r , the radial distance from the beam, ϕ \phi , the angle in azimuth, and θ \theta , the polar angle; the origin is taken to be the geometric center of the detector. The pseudorapidity, η \eta , is described as a function of θ \theta : η = − \eta=- ln [ [ tan ( θ 2 ) ] (\frac{\theta}{2})] . Transverse momentum and energy are defined as p T = p ​ sin ⁡ θ p_{{T}}=p\sin\theta and E T = E ​ sin ⁡ θ E_{T}=E\sin\theta , respectively

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The CDF Collaboration, FERMILAB-PUB-96-390-E

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The additional energy in a cone of Δ ​ R < 0.4 \Delta R<0.4 must be less than 0.1 × E T γ 0.1\times E_{T}^{\gamma} if E T γ < 20 E_{T}^{\gamma}<20 GeV and less than 2 + 0.02 × ( E T γ − 20 ) 2+0.02\times(E_{T}^{\gamma}-20) if E T γ > 20 E_{T}^{\gamma}>20 GeV for a photon to pass the isolation selection

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Missing E T E_{T} ( / ​ E T \hbox to0.0pt{\kern 1.49994pt/\hss}E_{T} ) is defined by / ​ E T → = − Σ i ​ E T i ​ n ^ i \vec{\hbox to0.0pt{\kern 1.49994pt/\hss}E_{T}}=-\Sigma_{i}E_{T}^{i}\hat{n}_{i} , where i i is the calorimeter tower number for | η | < 3.6 |\eta|<3.6 , and n ^ i \hat{n}_{i} is a unit vector perpendicular to the beam axis and pointing at the i t ​ h i^{th} tower. ( / ​ E T = | / ​ E T → | \hbox to0.0pt{\kern 1.49994pt/\hss}E_{T}=|\vec{\hbox to0.0pt{\kern 1.49994pt/\hss}E_{T}}| )

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