Abstract
We propose leveraging our proficiency for detecting Higgs resonances by using the Higgs as a tagging object for new heavy physics. In particular, we argue that searches for exotic Higgs production from decays of color-singlet fields with electroweak charges could beat current searches at the LHC which look for their decays to vectors. As an example, we study the production and decay of vector-like leptons which admit Yukawa couplings with SM leptons. We find that bounds from Run 2 searches are consistent with anywhere from hundreds to many thousands of Higgses having been produced in their decays over the same period, depending on the representation. Dedicated searches for these signatures may thus be able to significantly improve our reach at the electroweak energy frontier.
Highlights
With the discovery of the Higgs boson at the Large Hadron Collider (LHC) [1,2], we have completely explored the map of the basic ingredients of the Standard Model (SM)—as drawn up by particle physicists in the 1960s and 1970s
We must wring every bit of constraining power out of the data we collect at the experiments
Note that a 100 TeV collider this century will not necessarily be able to make up this lost opportunity— data at different center-of-mass energies are complementary, and data from the Tevatron has still been useful in the LHC era
Summary
With the discovery of the Higgs boson at the Large Hadron Collider (LHC) [1,2], we have completely explored the map of the basic ingredients of the Standard Model (SM)—as drawn up by particle physicists in the 1960s and 1970s. While the hierarchy problem has these past decades motivated focusing on our reach for discovering new colored particles, the LHC increasingly rebuffs the traditional models spurring such hopes Important questions such as baryogenesis and neutrino masses could be resolved by electroweakcharged but color-singlet physics that may be accessible at the electroweak energy frontier. This is far greater than the number of signal events needed for conclusive discovery of the Higgs itself, though one never detects all the events, and we do not attempt to simulate a new search ourselves This still evinces enormous complementarity with low-energy SMEFT constraints, which strongly depend on the Yukawa couplings of the new fields and their mixing with SM leptons. As we approach run 3 and gear up for the highluminosity LHC (HL-LHC) [74] and a few more decades of fantastic and productive collider physics at the LHC, we hope this work will allow searches offering greater insight into electroweak physics above the electroweak scale, and into the physics of the Higgs boson
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