Jul 26 – 30, 2021
US/Eastern timezone

Goldstone Scattering with a Light Composite Scalar

Jul 29, 2021, 2:00 PM
Oral presentation Particle physics beyond the Standard Model Particle physics beyond the Standard Model


James Ingoldby (ICTP (Trieste))


In this talk, we present a lattice study of the scattering of pseudo-Goldstone Bosons in SU(3) gauge theory with $N_f=8$ light Dirac fermions, a theory which lies close to the boundary of the conformal window. The scattering phase shift is measured in the s-wave, maximal isospin channel for different values of the scattering momentum, as well as for different values of the underlying fermion mass. A light singlet scalar in the spectrum has been reported in earlier studies, and its effect on the scattering of pseudo-Goldstones is examined by comparing the lattice measurements to a dilaton EFT.

Primary authors

Thomas Appelquist (Yale) Richard Brower (Boston University) George Fleming (Yale University) Andrew David Gasbarro (Universität Bern) Anna Hasenfratz (university of colorado boulder) Joe Kiskis (UC Davis) James C Osborn (Argonne ALCF) Claudio Rebbi (Boston University) Enrico Rinaldi (Lawrence Livermore National Laboratory) David Schaich (University of Liverpool) Pavlos Vranas (LLNL) Evan Weinberg (NVIDIA Corporation) Oliver Witzel (Universität Siegen) James Ingoldby (ICTP (Trieste))

Presentation materials