Helicity selection rules and noninterference for BSM amplitudes
By A. Azatov, Roberto Contino, C. S. Machado, F. Riva. 2016
148 citations recorded by the source corpus.
Precision studies of scattering processes at colliders provide powerful indirect constraints on new physics. We study the helicity structure of scattering amplitudes in the standard model (SM) and in the context of an effective Lagrangian description of beyond-the-SM (BSM) dynamics. Our analysis reveals a novel set of helicity selection rules according to which, in the majority of 2 -> 2 scattering processes at high energy, the SM and the leading BSM effects do not interfere. In such situations, the naive expectation that dimension-6 operators represent the leading BSM contribution is compromised, as corrections fromdimension-8 operators can become equally (if not more) important well within the validity of the effective field theory approach.
Subfields: Nuclear and High Energy Physics
View Paper: https://www.semanticscholar.org/paper/698160da7fd979732c65f14f4d64f88612e93907
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In Nuclear and High Energy Physics
- Cms Collaboration
- Atlas Collaboration
- Gudrun Heinrich
- Fabio Maltoni
- Valentin Hirschi
- R. Frederix
- M. Zaro
- Ansgar Denner
Citations in the corpus
- Higgs Physics at the HL-LHC and HE-LHC (2019, background): “This is a consequence of the helicity selection rules, see [437, 438, 418, 417].”
- A Monte Carlo global analysis of the Standard Model Effective Field Theory: the top quark sector (2019, background): “For instance, it has been observed that in diboson production at the LHC, the helicity selection rule [92] leads to an energy suppression in the interference term, so the sensitivity to TGC couplings is dominated by O(Λ−4) terms [84].”