Detecting quark anomalous electroweak couplings at the LHC

Abstract

We study the dimension-6 quark anomalous electroweak couplings in the formulation of linearly realized effective Lagrangian. We investigate the constraints on these anomalous couplings from the $pp\to W^{+}{W}^{-}$ process in detail at the LHC. With additional kinematic cuts, we find that the 14 TeV LHC can provide a test of anomalous couplings of $O(0.1-1){\mathrm{TeV}}^{-2}$. The $pp\to ZZ/Z\gamma /\gamma \gamma$ processes can provide a good complement as they are sensitive to those anomalous couplings which do not affect the $pp\to W^{+}{W}^{-}$ process. Those processes that only contain anomalous triple vertices, like $pp\to W^{\ast }\to l{\nu }_l$ or $pp\to {\gamma }^{\ast }/Z^{\ast }\to l^{+}{l}^{-}$, can improve the sensitivities to $O(0.01-0.1){\mathrm{TeV}}^{-2}$. We also study the kinematic differences between different anomalous couplings and discuss the potential of the ${\chi }^2$-analysis to distinguish them. Finally, we discuss the detection ability of the possible future 100 TeV proton-proton collider(SPPC), and find that the detection sensitivity is improved by about one order of magnitude compared with the LHC.

20 pages, 7 figures

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