Scrutinizing the ZW+W- vertex at the Large Hadron Collider at 7 TeV

Abstract

We analyze the potential of the CERN Large Hadron Collider running at 7 TeV to search for deviations from the Standard Model predictions for the triple gauge boson coupling ZW+W- assuming an integrated luminosity of 1 fb^{-1}. We show that the study of W+W- and W^\pm Z productions, followed by the leptonic decay of the weak gauge bosons can improve the present sensitivity on the anomalous couplings Δg_1^Z, Δκ_Z, λ_Z, g_4^Z, and \tildeλ_Z at the 2σlevel.

Figures (3)

• Figure 1: Normalized spectra for some relevant kinematic variables for the SM and some of the anomalous TGV's for $pp \to \ell^+\ell^{\prime -} /\!\!\!E_T$ (upper panels) and $p p \to \ell^{\prime \pm} \ell^{+}\ell^{-} /\!\!\!E_T$ (lower panels). The upper panels show the distribution in transverse momentum of the hardest lepton (left panel), dilepton invariant mass (central panel) and reconstructed $WW$ transverse invariant mass (right panel). The lower panels show the transverse momentum of the $Z$ (left panel), hardest lepton transverse momentum (central panel), and reconstructed $WZ$ transverse invariant mass (right panel).
• Figure 2: Dependence of the upper (top panels) and lower (lower panels) $2\sigma$ bounds achievable from the study of $pp \to \ell^+\ell^{\prime -} /\!\!\!E_T$ as a function of the cut on the minimum value on the hardest lepton transverse momentum (left panels), the dilepton invariant mass (central panels), and the reconstructed $WW$ transverse invariant mass (right panels). The dashed curves correspond to $\tilde{\lambda}_Z$ and are almost indistinguishable from the full blue lines corresponding to $\lambda_Z$ . The presently allowed $2\sigma$ ranges are indicated by the vertical lines in the left panels.
• Figure 3: Dependence of the upper (top panels) and lower (lower panels) $2\sigma$ bounds from $p p \to \ell^{\prime \pm} \ell^{+}\ell^{-} /\!\!\!E_T$ a function of the cut on the minimum value on the $Z$ transverse momentum (left panels), the hardest lepton transverse momentum (central panels), and the reconstructed $WZ$ invariant mass (right panels). The dashed curves correspond to $\tilde{\lambda}_Z$ and are almost indistinguishable from the full blue lines corresponding to $\lambda_Z$ . The presently allowed $2\sigma$ ranges are indicated by the vertical lines in the left panels.