Appelquist, T, Brower, RC, Cushman, KK, Fleming, GT, Gasbarro, A, Hasenfratz, A, Ingoldby, J, Jin, XY, Kiskis, J, Neil, ET et al (show 7 more authors)
(2022)
Goldstone Boson Scattering with a Light Composite Scalar.
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Abstract
The appearance of a light composite $0^+$ scalar resonance in nearly conformal gauge-fermion theories motivates further study of the low energy structure of these theories. To this end, we present a nonperturbative lattice calculation of s-wave scattering of Goldstone bosons in the maximal-isospin channel in SU(3) gauge theory with $N_f=8$ light, degenerate flavors. The scattering phase shift is measured both for different values of the underlying fermion mass and for different values of the scattering momentum. We examine the effect of a light flavor-singlet scalar (reported in earlier studies) on Goldstone boson scattering, employing a dilaton effective field theory (EFT) at the tree level. The EFT gives a good description of the scattering data, insofar as the magnitude of deviations between EFT and lattice data are no larger than the expected size of next-to-leading order corrections in the EFT.
| Item Type: | Article |
|---|---|
| Additional Information: | 13 pages, 6 figures, 4 tables |
| Uncontrolled Keywords: | hep-ph, hep-ph, hep-lat |
| Divisions: | Faculty of Science and Engineering > School of Physical Sciences |
| Depositing User: | Symplectic Admin |
| Date Deposited: | 16 Aug 2021 07:34 |
| Last Modified: | 18 Jan 2023 21:33 |
| DOI: | 10.1103/PhysRevD.105.034505 |
| Related URLs: | |
| URI: | https://livrepository.liverpool.ac.uk/id/eprint/3133473 |
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