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Novel view of the flavor-singlet spectrum from multi-flavor QCD on the lattice

Yasumichi Aoki Orcid Logo, Tatsumi Aoyama, Ed Bennett Orcid Logo, Toshihide Maskawa, Kohtaroh Miura Orcid Logo, Hiroshi Ohki, Enrico Rinaldi Orcid Logo, Akihiro Shibata, Koichi Yamawaki, Takeshi Yamazaki, (LatKMI Collaboration)

Physical Review D, Volume: 112, Issue: 11

Swansea University Author: Ed Bennett Orcid Logo

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DOI (Published version): 10.1103/vnml-g6nx

Abstract

SU(3) gauge theories with an increasing number of light fermions are the templates of strongly interacting sectors and studying their low-energy dynamics and spectrum is important, both forunderstanding the strong dynamics of QCD itself, and for discovering viable UV completions ofbeyond the Standar...

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Published in: Physical Review D
ISSN: 2470-0010 2470-0029
Published: American Physical Society (APS) 2025
Online Access: Check full text

URI: https://cronfa.swan.ac.uk/Record/cronfa70956
Abstract: SU(3) gauge theories with an increasing number of light fermions are the templates of strongly interacting sectors and studying their low-energy dynamics and spectrum is important, both forunderstanding the strong dynamics of QCD itself, and for discovering viable UV completions ofbeyond the Standard Model physics. In order to contrast many-flavor strongly interacting theories with QCD on a quantitative footing, we use lattice field theory simulations. We focus on the study of the flavor-singlet spectrum in the scalar and pseudoscalar channels: This is an interesting probe of thedynamics of the strongly interacting sector, as reminded by the QCD case with the f0(500) (σ) and η'mesons. The hierarchy of the spectrum of a strongly coupled new gauge sector of the Standard Modeldefines the potential reach of future colliders for new physics discoveries. In addition to a novel hierarchy with light scalars, introducing many light flavors at fixed number of colors can influence the dynamics of the lightest flavor-singlet pseudoscalar. We present a complete lattice study of both of these flavor-singlet channels on high-statistics gauge ensembles generated by the LatKMI Collaboration with 4, 8, and 12 copies of light mass-degenerate fermions. We also present other hadron masses on the lightest ensemble for Nf = 8 generated by the LatKMI Collaboration and discuss the chiral extrapolation of the spectrum in this particular theory. We contrast the results to Nf = 4 simulations and previous results of Nf = 12 simulations.
College: Faculty of Science and Engineering
Funders: This work is supported by the JSPS Grants-in-Aid for Scientific Research (S) Grants No. 22224003, (C) No. 16K05320 (Y. A.) for Young Scientists (A) No. 16H06002 (T. Y.), (B) No. 25800138 (T. Y.), (B) No. 25800139 (H. O.), and (B) No. 15K17644 (K. M.). E. B. acknowledges the support of the UKRI Science and Technology Facilities Council Research Software Engineering Fellowship No. EP/V052489/1, the EPSRC ExCALIBUR program ExaTEPP (Project No. EP/X017168/1), the STFC Consolidated Grant No. ST/T000813/1, and the Supercomputing Wales program, which is partially funded by the European Regional Development Fund via the Welsh Government. K. M. is supported by the OCEVU Labex (Grant No. ANR-11-LABX-0060) and the A*MIDEX project (Grant No. ANR11-IDEX-0001-02) funded by the “Investissements d’Avenir” French government program and managed by the ANR. H. O. is supported in part by the JSPS KAKENHI (Grants No. 21K03554 and No. 22H00138). T. Y. is supported in part by Grants-in-Aid for Scientific Research (Grants No. 19H01892, No. 23H01195, and No, 23K25891) and MEXT as “Program for Promoting Researches on the Supercomputer Fugaku” Grant No. JPMXP1020230409. This work is supported by the Japan Lattice Data Grid constructed over the Science Information NETwork 6 of NII.
Issue: 11

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