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Lattice investigations of the chimera baryon spectrum in the (4) gauge theory
Ed Bennett 
,
Deog Ki Hong ,
Ho Hsiao ,
Jong-Wan Lee ,
C.-J. David Lin ,
Biagio Lucini ,
Maurizio Piai ,
Davide Vadacchino
,
Deog Ki Hong ,
Ho Hsiao ,
Jong-Wan Lee ,
C.-J. David Lin ,
Biagio Lucini ,
Maurizio Piai ,
Davide Vadacchino
Physical Review D, Volume: 109, Issue: 9
Swansea University Authors:
Ed Bennett , Biagio Lucini , Maurizio Piai
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DOI (Published version): 10.1103/physrevd.109.094512
Abstract
We report the results of lattice numerical studies of the Sp(4) gauge theory coupled to fermions (hyperquarks) transforming in the fundamental and two-index antisymmetric representations of the gauge group. This strongly-coupled theory is the minimal candidate for the ultraviolet completion of compo...
| Published in: | Physical Review D |
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| ISSN: | 2470-0010 2470-0029 |
| Published: |
American Physical Society (APS)
2024
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| Online Access: |
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| URI: | https://cronfa.swan.ac.uk/Record/cronfa65979 |
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| Abstract: |
We report the results of lattice numerical studies of the Sp(4) gauge theory coupled to fermions (hyperquarks) transforming in the fundamental and two-index antisymmetric representations of the gauge group. This strongly-coupled theory is the minimal candidate for the ultraviolet completion of composite Higgs models that facilitate the mechanism of partial compositeness for generating the top-quark mass. We measure the spectrum of the low-lying, half-integer spin, bound states composed of two fundamental and one antisymmetric hyperquarks, dubbed chimera baryons, in the quenched approximation.In this first systematic, non-perturbative study, we focus on the three lightest parity-even chimera- baryon states, in analogy with QCD, denoted as Λ(CB), Σ(CB) (both with spin 1/2), and Σ(CB)* (with spin 3/2). The spin-1/2 such states are candidates of the top partners. The extrapolation of our results to the continuum and massless-hyperquark limit is performed using formulae inspired by QCD heavy-baryon Wilson chiral perturbation theory. Within the range of hyperquark masses in our simulations, we find that Σ(CB) is not heavier than Λ(CB). |
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| College: |
Faculty of Science and Engineering |
| Funders: |
The work of E.B. has been supported by the UKRI ScienceandTechnologyFacilitiesCouncil(STFC)Research Software Engineering Fellowship No. EP/V052489/1, and by the Theoretical and Experimental Particle Physics at the Exascale Frontier Project No. EP/X017168/1. The work of D.K.H.wassupported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (Grant No. NRF2017R1D1A1B06033701). The work of J.W.L. was supported in part by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) (Grant No. NRF-2018R1C1B3001379) and by IBS under the project code, IBS-R018-D1. The work of D.K.H. and J.W.L. was further supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) (2021R1A4A5031460). The work of H.H. and C.J.D.L. is supported by the TaiwaneseMoST grant No. 109-2112-M-009-006-MY3 andNSTCGrant No. 112-2112-M-A49-021-MY3. The workofB.L.andM.P.hasbeensupportedinpartbythe STFCConsolidatedGrantsNo. ST/P00055X/1,No. ST/ T000813/1,andNo.ST/X000648/1.B.L.andM.P.received fundingfromtheEuropeanResearchCouncil(ERC)under theEuropeanUnion’sHorizon2020researchandinnovation programunderGrantAgreementNo.813942.Theworkof B.L. is further supported inpart by theRoyal Society WolfsonResearchMeritAwardNo.WM170010andby theLeverhulmeTrustResearchFellowshipNo.RF-20204619. Thework ofD.V. is supported bySTFCunder ConsolidatedGrantNo.ST/X000680/1.Numerical simulations havebeenperformedon theSwanseaUniversity SUNBIRD cluster (part of the SupercomputingWales project)andAccelerateAIA100GPUsystem,onthelocal HPCclusters inPusanNationalUniversity(PNU) and in NationalYangMingChiaoTungUniversity(NYCU),andon theDiRACDataIntensiveserviceatLeicester.TheSwansea UniversitySUNBIRDsystemandAccelerateAI are part funded by the European Regional Development Fund (ERDF) via Welsh Government. The DiRAC Data IntensiveserviceatLeicester isoperatedbytheUniversity ofLeicester ITServices,which formspart of theSTFC DiRACHPCFacility([120]).TheDiRACDataIntensive serviceequipmentatLeicesterwasfundedbyBEIScapital fundingviaSTFCcapitalGrantsNo.ST/K000373/1 and No. ST/R002363/1 andSTFCDiRACOperations grant No. ST/R001014/1. DiRAC is part of theNational eInfrastructure. |
| Issue: |
9 |