Geometry of the scalar sector
Abstract
The S-matrix of a quantum field theory is unchanged by field redefinitions, and so it only depends on geometric quantities such as the curvature of field space. Whether the Higgs multiplet transforms linearly or non-linearly under electroweak symmetry is a subtle question since one can make a coordinate change to convert a field that transforms linearly into one that transforms non-linearly. Renormalizability of the Standard Model (SM) does not depend on the choice of scalar fields or whether the scalar fields transform linearly or non-linearly under the gauge group, but only on the geometric requirement that the scalar field manifold M is flat. Standard Model Effective Field Theory (SMEFT) and Higgs Effective Field Theory (HEFT) have curved M, since they parametrize deviations from the flat SM case. We show that the HEFT Lagrangian can be written in SMEFT form if and only ifMhas a SU(2)L U(1)Y invariant fixed point. Experimental observables in HEFT depend on local geometric invariants of M such as sectional curvatures, which are of order 1/Λ2 , where Λ is the EFT scale. We give explicit expressions for these quantities in terms of the structure constants for a general G → H symmetry breaking pattern. The one-loopmore »
- Authors:
-
- University of California, San Diego, La Jolla, CA (United States). Department of Physics
- University of California, San Diego, La Jolla, CA (United States). Department of Physics; CERN TH Division, Geneva (Switzerland)
- Publication Date:
- Research Org.:
- University of California, San Diego, La Jolla, CA (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1434582
- Grant/Contract Number:
- SC0009919
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of High Energy Physics (Online)
- Additional Journal Information:
- Journal Name: Journal of High Energy Physics (Online); Journal Volume: 2016; Journal Issue: 8; Journal ID: ISSN 1029-8479
- Publisher:
- Springer Berlin
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; Effective field theories; Gauge Symmetry; Sigma Models
Citation Formats
Alonso, Rodrigo, Jenkins, Elizabeth E., and Manohar, Aneesh V. Geometry of the scalar sector. United States: N. p., 2016.
Web. doi:10.1007/JHEP08(2016)101.
Alonso, Rodrigo, Jenkins, Elizabeth E., & Manohar, Aneesh V. Geometry of the scalar sector. United States. https://doi.org/10.1007/JHEP08(2016)101
Alonso, Rodrigo, Jenkins, Elizabeth E., and Manohar, Aneesh V. Wed .
"Geometry of the scalar sector". United States. https://doi.org/10.1007/JHEP08(2016)101. https://www.osti.gov/servlets/purl/1434582.
@article{osti_1434582,
title = {Geometry of the scalar sector},
author = {Alonso, Rodrigo and Jenkins, Elizabeth E. and Manohar, Aneesh V.},
abstractNote = {The S-matrix of a quantum field theory is unchanged by field redefinitions, and so it only depends on geometric quantities such as the curvature of field space. Whether the Higgs multiplet transforms linearly or non-linearly under electroweak symmetry is a subtle question since one can make a coordinate change to convert a field that transforms linearly into one that transforms non-linearly. Renormalizability of the Standard Model (SM) does not depend on the choice of scalar fields or whether the scalar fields transform linearly or non-linearly under the gauge group, but only on the geometric requirement that the scalar field manifold M is flat. Standard Model Effective Field Theory (SMEFT) and Higgs Effective Field Theory (HEFT) have curved M, since they parametrize deviations from the flat SM case. We show that the HEFT Lagrangian can be written in SMEFT form if and only ifMhas a SU(2)L U(1)Y invariant fixed point. Experimental observables in HEFT depend on local geometric invariants of M such as sectional curvatures, which are of order 1/Λ2 , where Λ is the EFT scale. We give explicit expressions for these quantities in terms of the structure constants for a general G → H symmetry breaking pattern. The one-loop radiative correction in HEFT is determined using a covariant expansion which preserves manifest invariance of M under coordinate redefinitions. The formula for the radiative correction is simple when written in terms of the curvature of M and the gauge curvature field strengths. We also extend the CCWZ formalism to non-compact groups, and generalize the HEFT curvature computation to the case of multiple singlet scalar fields.},
doi = {10.1007/JHEP08(2016)101},
journal = {Journal of High Energy Physics (Online)},
number = 8,
volume = 2016,
place = {United States},
year = {Wed Aug 17 00:00:00 EDT 2016},
month = {Wed Aug 17 00:00:00 EDT 2016}
}
Web of Science
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