Two paths towards precision at a very high energy lepton collider
Abstract
We illustrate the potential of a very high energy lepton collider (from 10 to 30 TeV center of mass energy) to explore new physics indirectly in the vector boson fusion double Higgs production process and in direct diboson production at high energy. Double Higgs production is found to be sensitive to the anomalous Higgs trilinear coupling at the percent level, and to the Higgs compositeness ξ parameter at the per mille or subper mille level thanks to the measurement of the crosssection in the diHiggs high invariant mass tail. High energy diboson (and triboson) production is sensitive to Higgslepton contact interaction operators at a scale of several tens or hundred TeV, corresponding to a reach on the Higgs compositeness scale well above the one of any other future collider project currently under discussion. This result follows from the unique capability of the very high energy lepton collider to measure Electroweak crosssections at 10 TeV energy or more, where the effect of new physics at even higher energy is amplified. The general lesson is that the standard path towards precision physics, based on measurements of highstatistics processes such as single and double Higgs production, is accompanied at the very high energy lepton collider by a second strategy based on measurements at the highest available energy.
 Publication:

Journal of High Energy Physics
 Pub Date:
 May 2021
 DOI:
 10.1007/JHEP05(2021)219
 arXiv:
 arXiv:2012.11555
 Bibcode:
 2021JHEP...05..219B
 Keywords:

 Beyond Standard Model;
 Higgs Physics;
 Effective Field Theories;
 High Energy Physics  Phenomenology;
 High Energy Physics  Experiment
 EPrint:
 32 pages, 12 figures, 9 tables