![]() A new ATLAS analysis released today uses combined measurements of the properties of the Higgs boson to search for signs of new phenomena using this EFT framework. ![]() Since these additional interactions would affect all physics processes, ATLAS scientists are implementing a new search strategy that combines measurements across the full spectrum of their research programme. However, the effects can be subtle, especially if the high-mass phenomena are far beyond the reach of the LHC’s collision energy. Almost all types of new physics give rise to these new interactions, with different theoretical models leaving different footprints on the EFT. Since their underlying mechanisms are unknown, these interactions are called “effective” interactions, and their framework “effective field theory” (EFT). Instead of looking for a new particle, physicists can look for new types of interactions, not present in the Standard Model. The Standard Model prediction for these coefficients is zero. The coefficient cHq(3), for example, describes the strength of an effective four-particle interaction between two quarks, a gauge boson and the Higgs boson – which is not present in the Standard Model. A very effective model Figure 1: Allowed ranges for the coupling coefficients of new EFT interactions. Just as gently sloping terrain may indicate the presence of a mountain peak ahead, LHC data may contain some hints that interesting phenomena are present at higher energy scales. However, Nature is not always so kind and new resonances may be so massive that their production requires collision energies beyond that of the LHC. Some theories predict an as-yet undiscovered particle could be found in the form of a new resonance (a narrow peak) similar to the one that heralded the discovery of the Higgs boson in 2012. LHC physicists are on the hunt for many different forms of phenomena beyond the Standard Model.
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