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Minimal Extension of the Standard Model Scalar Sector
Donal O'Connell, Michael J. Ramsey-Musolf, Mark B. Wise
The minimal extension of the scalar sector of the standard model contains an additional real scalar field with no gauge quantum numbers. Such a field does not couple to the quarks…
Two Meson Systems with Ginsparg-Wilson Valence Quarks
Jiunn-Wei Chen, Donal O'Connell, Andre Walker-Loud
Unphysical effects associated with finite lattice spacing and partial quenching may lead to the presence of unphysical terms in chiral extrapolation formulae. These unphysical term…
GW Meson Scattering on a Staggered Sea
Donal O'Connell
We discuss the structure of the NLO corrections to the chiral formulae for mesonic scattering processes in mixed action simulations using Ginsparg-Wilson valence quarks and stagger…
The Story of \cal O: Positivity constraints in effective field theories
Alejandro Jenkins, Donal O'Connell
We propose a simple method for identifying operators in effective field theories whose coefficients must be positive by causality. We also attempt to clarify the relationship betwe…
Regulator Dependence of the Proposed UV Completion of the Ghost Condensate
Donal O'Connell
Recently, it was shown that a renormalizable theory of heavy fermions coupled to a light complex boson could generate an effective action for the boson with the properties required…