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Studies of dimension-six EFT effects in vector boson scattering
http://repo.scoap3.org/record/32608
We discuss the implications of dimension-six operators of the effective field theory framework in the study of vector boson scattering in the pp→ZZjj \documentclass[12pt]{minimal}
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\begin{document}$$pp \rightarrow Z Z j j $$\end{document} channel. We show that operators of dimension six should not be neglected in favour of those of dimension eight. We observe that this process is very sensitive to some of the operators commonly fit using LEP and Higgs data, and that it can be used to improve the bounds on the former. Further we show that other operators than the ones generating anomalous triple and quartic gauge couplings (aTGCs/aQCGs) can have a non-negligible impact on the total and differential rates and their shapes. For this reason, a correct interpretation of the experimental results can only be achieved by including all the relevant bosonic and fermionic operators; we finally discuss how such an interpretation of experimental measurements can be developed.Gomez-Ambrosio, RaquelTue, 07 May 2019 02:38:26 GMThttp://repo.scoap3.org/record/326082019-5-6Low energy behaviour of standard model extensions
http://repo.scoap3.org/record/15795
The integration of heavy scalar fields is discussed in a class of BSM models, containing more that one representation for scalars and with mixing. The interplay between integrating out heavy scalars and the Standard Model decoupling limit is examined. In general, the latter cannot be obtained in terms of only one large scale and can only be achieved by imposing further assumptions on the couplings. Systematic low-energy expansions are derived in the more general, non-decoupling scenario, including mixed tree-loop and mixed heavy-light generated operators. The number of local operators is larger than the one usually reported in the literature.Boggia, MicheleSat, 28 May 2016 07:22:57 GMThttp://repo.scoap3.org/record/15795urn:ISSN:1029-8479Springer/SISSA2016-05-27NLO Higgs effective field theory and κ-framework
http://repo.scoap3.org/record/11312
A consistent framework for studying Standard Model deviations is developed. It assumes that New Physics becomes relevant at some scale beyond the present experimental reach and uses the Effective Field Theory approach by adding higher-dimensional operators to the Standard Model Lagrangian and by computing relevant processes at the next-to-leading order, extending the original κ -framework. The generalized κ -framework provides a useful technical tool to decompose amplitudes at NLO accuracy into a sum of well defined gauge-invariant sub components.Ghezzi, MargheritaMon, 03 Aug 2015 07:36:47 GMThttp://repo.scoap3.org/record/11312urn:ISSN:1029-8479Springer/SISSA2015-07-31