Abstract

Triboson processes allow for a measurement of the triple and quartic couplings of the Standard Model gauge bosons, which can be used to constrain anomalous gauge couplings. In this paper we calculate the next-to-leading order electroweak corrections to fully off-shell W−W+W+ production, namely the production of a {ell}_1^{-}{ell}_2^{+}{ell}_3^{+}{overline{nu}}_{ell_1}{nu}_{ell_2}{nu}_{ell_3} final state with (ℓi = e, μ), including all triple, double, single and non resonant topologies and interferences of diagrams with all different vector boson (W, Z, γ) intermediate states. We find large cancellations of the electroweak correction to the qoverline{q} -induced channel, which includes the exchange of virtual electroweak gauge bosons, and photon-induced jet radiation processes. This accidental compensation is found to be strongly phase space and observable dependent. The resulting corrections in a suitably defined fiducial region thus amount to −2.0%, but rise rapidly for other observables.

Highlights

  • Triboson processes allow for a measurement of the triple and quartic couplings of the Standard Model gauge bosons, which can be used to constrain anomalous gauge couplings

  • We find large cancellations of the electroweak correction to the qq-induced channel, which includes the exchange of virtual electroweak gauge bosons, and photon-induced jet radiation processes

  • 2ν with i = e, μ. τ lepton final states are not considered here, even though they may lead to similar signatures

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Summary

Anatomy of trilepton production processes

Trilepton production may be associated with one neutrino (W Z production), three neutrinos (W W W and W ZZ production), a bb-pair and three neutrinos (ttW production), a b-quark, a light quark and one neutrino (tZj production), a b-quark, a light quark and three neutrinos (tW W j production), or an even higher number of final state particles. As this publication concerns itself with trilepton production in off-shell triboson processes, this category will be examined in detail in the following. Τ lepton final states are not considered here, even though they may lead to similar signatures.. + 3 trilepton final states are discussed here. I = e, μ involves fourteen different lepton channels, of which only six comprise a distinct set of Feynman diagrams. This table states the corresponding triboson channels in the on-shell approximation

Calculational setup
B IS FS qq 98 992 88 388 98 302 88 388 88 194 43 216
Results
Gμ μ2W sin2 θw π
Inclusive cross sections
Differential distributions
Conclusions
Full Text
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