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Positively identifying Higgs effective field theory or standard model effective field theory
1
Zitationen
2
Autoren
2026
Jahr
Abstract
We establish the bounds on Wilson coefficients of the Higgs effective field theory (HEFT) mandated by unitarity and analyticity. These positivity constraints can be projected into the space of the standard model effective field theory (SMEFT) as <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"> <a:mrow> <a:mi>HEFT</a:mi> <a:mo stretchy="false">⊃</a:mo> <a:mi>SMEFT</a:mi> </a:mrow> </a:math> . Doing so reveals a subspace allowed by the HEFT but forbidden by SMEFT positivity, thereby identifying a region that could herald the use of the wrong EFT rather than a pathological UV. Restricting to custodial symmetric dimension-eight Higgs operators, there is a unique pair within the SMEFT where this concept can be sharply realized and is already being probed at colliders.
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