Seminars

# Higgs compositeness in Sp(2N) gauge theories: a first-principle numerical study

## by Prof. Biagio Lucini (Swansea University)

Monday, 19 March 2018 from to (Europe/Vienna)
at HEPHY ( Library )
 Description Compositeness provides an elegant fundamental mechanism for electroweak symmetry breaking. The essential ingredient is the existence of a new strong force that breaks chiral symmetry. Through the gauging of an appropriate SU(2) x U(1) subgroup of the residual symmetry group, the Nambu-Goldstone boson associated to the symmetry breaking becomes the Standard Model Higgs. The Sp(4) gauge theory with two Dirac fundamental flavours provides a candidate for the microscopic origin of composite Higgs models based on the SU(4)/Sp(4) coset of the chiral symmetry breaking, which has been advocated as having a phenomenology compatible with the Standard Model. We report on the first non-perturbative calculation from first principles of this theory. We present the first results for the spectrum of glueballs of the pure Sp(4) Yang-Mills theory, an EFT framework for the interpretation of the masses and decay constants of the lightest pion, vector and axial-vector mesons, and a preliminary calculation of the latter in the quenched approximation. We conclude by introducing the technical steps necessary to set up future investigations of the mesonic spectrum of the full theory. Material: