Gluonic observables and the scalar spectrum of twelve-flavour QCD
Abstract
We measure glueball masses and the string tension in twelve-flavour QCD, aiming at comparing the emerging gluonic spectrum to the mesonic one. When approaching the critical surface at zero quark mass, the hierarchy of masses in the different sectors of the spectrum gives a new handle to determine the existence of an infrared fixed point. We describe the details of our gluonic measurements and the results obtained on a large number of gauge configurations generated with the HISQ action. In particular, we focus on the scalar glueball and its mixing with a flavour-singlet fermionic state, which is lighter than the pseudoscalar (would-be pion) state. The results are interesting in view of a light composite Higgs boson in walking technicolor theories.
Keywords
Cite
@article{arxiv.1310.0963,
title = {Gluonic observables and the scalar spectrum of twelve-flavour QCD},
author = {Yasumichi Aoki and Tatsumi Aoyama and Masafumi Kurachi and Toshihide Maskawa and Kohtaroh Miura and Kei-ichi Nagai and Hiroshi Ohki and Enrico Rinaldi and Akihiro Shibata and Koichi Yamawaki and Takeshi Yamazaki},
journal= {arXiv preprint arXiv:1310.0963},
year = {2013}
}
Comments
7 pages, 4 figures. Prepared for the 31st International Symposium on Lattice Field Theory