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Lattice study of the scalar and baryon spectra in many-flavor QCD

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arxiv 1510.07373 v1 pith:CYCVGCXB submitted 2015-10-26 hep-lat hep-ph

Yasumichi Aoki , Tatsumi Aoyama , Ed Bennett , Masafumi Kurachi , Toshihide Maskawa , Kohtaroh Miura , Kei-ichi Nagai , Hiroshi Ohki
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Enrico Rinaldi Akihiro Shibata Koichi Yamawaki Takeshi Yamazaki
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classification hep-lathep-ph
keywords scalarbaryoncandidatecompositedarklatticematterresults
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abstract

In the search for a composite Higgs boson in walking technicolor models, many flavor QCD, in particular with $N_f=8$, is an attractive candidate, and has been found to have a composite flavor-singlet scalar as light as the pion. Based on lattice simulations of this theory with the HISQ action, we will present our preliminary results on the scalar decay constant using the fermionic bilinear operator, and on the mass of the lightest baryon state which could be a dark matter candidate. Combining these two results, implications for dark matter direct detection are also discussed.

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  1. A novel view of the flavor-singlet spectrum from multi-flavor QCD on the lattice

    hep-lat 2025-05 conditional novelty 6.0 of 10

    In SU(3) gauge theory with Nf = 4, 8, and 12 flavors, the normalized eta-prime mass sqrt(8t0) M_eta' takes values near 2.5, 5.0, and 7.5, consistent with n_f^2 scaling in the anti-Veneziano limit.

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