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Title: Constraining the top-Higgs sector of the standard model effective field theory

Working in the framework of the Standard Model effective field theory, we study chirality-flipping couplings of the top quark to Higgs and gauge bosons. In this paper, we discuss in detail the renormalization-group evolution to lower energies and investigate direct and indirect contributions to high- and low-energy $CP$-conserving and $CP$-violating observables. Our analysis includes constraints from collider observables, precision electroweak tests, flavor physics, and electric dipole moments. We find that indirect probes are competitive or dominant for both $CP$-even and $CP$-odd observables, even after accounting for uncertainties associated with hadronic and nuclear matrix elements, illustrating the importance of including operator mixing in constraining the Standard Model effective field theory. We also study scenarios where multiple anomalous top couplings are generated at the high scale, showing that while the bounds on individual couplings relax, strong correlations among couplings survive. In conclusion, we find that enforcing minimal flavor violation does not significantly affect the bounds on the top couplings.
Authors:
 [1] ;  [2] ;  [3] ;  [1]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States); New Mexico Consortium, Los Alamos, NM (United States)
  3. Nikhef, Amsterdam (Netherlands). Theory Group
Publication Date:
Report Number(s):
LA-UR-16-23433
Journal ID: ISSN 2470-0010
Grant/Contract Number:
AC52-06NA25396
Type:
Accepted Manuscript
Journal Name:
Physical Review D
Additional Journal Information:
Journal Volume: 94; Journal Issue: 3; Journal ID: ISSN 2470-0010
Publisher:
American Physical Society (APS)
Research Org:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Nikhef, Amsterdam (Netherlands)
Sponsoring Org:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26); LANL Laboratory Directed Research and Development (LDRD) Program; Netherlands Organisation for Scientific Research (NWO)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; extensions of fermion sector; particle interactions
OSTI Identifier:
1458946
Alternate Identifier(s):
OSTI ID: 1299444