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Symmetric Mass Generation with Four SU(2) Doublet Fermions

Journal Article · · Physical Review Letters
 [1];  [2];  [3]
  1. University of Illinois, Urbana-Champaign, IL (United States)
  2. Syracuse University, NY (United States)
  3. University of Colorado, Boulder, CO (United States)
+ Show Author Affiliations
We study a single exactly massless staggered fermion in the fundamental representation of an SU(2) gauge group. We utilize an nHYP-smeared fermion action supplemented with additional heavy Pauli-Villars fields that serve to decrease lattice artifacts. The phase diagram exhibits a clear two-phase structure with a conformal phase at weak coupling and a novel new phase, the symmetric mass generation (SMG) phase, appearing at strong coupling. The SMG phase is confining with all states gapped and chiral symmetry unbroken. Our finite size scaling analysis provides strong evidence that the phase transition between these two phases is continuous, which would allow for the existence of a continuum SMG phase. Furthermore, the renormalization group flows are consistent with a 𝛽 function that vanishes quadratically at the new fixed point, suggesting that the 𝑁𝑓 = 4 flavor SU(2) gauge theory lies at the opening of the conformal window.
Research Organization:
Colorado U.; Illinois U., Urbana; Syracuse U.; University of Colorado, Boulder, CO (United States)
Sponsoring Organization:
National Science Foundation (NSF); US Department of Energy; USDOE
Grant/Contract Number:
89243024CSC000002; SC0009998; SC0010005
OSTI ID:
2506857
Alternate ID(s):
OSTI ID: 3010772
OSTI ID: 2466211
Report Number(s):
FERMILAB-PUB-24-0550-V
Journal Information:
Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 3 Vol. 134; ISSN 1079-7114; ISSN 0031-9007
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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