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Title: CERN LHC phenomenology of an extended standard model with a real scalar singlet

Abstract

Gauge singlet extensions of the standard model (SM) scalar sector may help remedy its theoretical and phenomenological shortcomings while solving outstanding problems in cosmology. Depending on the symmetries of the scalar potential, such extensions may provide a viable candidate for the observed relic density of cold dark matter or a strong first order electroweak phase transition needed for electroweak baryogenesis. Using the simplest extension of the SM scalar sector with one real singlet field, we analyze the generic implications of a singlet-extended scalar sector for Higgs boson phenomenology at the Large Hadron Collider (LHC). We consider two broad scenarios: one in which the neutral SM Higgs and singlet mix and the other in which no mixing occurs and the singlet can be a dark matter particle. For the first scenario, we analyze constraints from electroweak precision observables and their implications for LHC Higgs phenomenology. For models in which the singlet is stable, we determine the conditions under which it can yield the observed relic density, compute the cross sections for direct detection in recoil experiments, and discuss the corresponding signatures at the LHC.

Authors:
; ;  [1];  [2];  [1]
  1. Department of Physics, University of Wisconsin, Madison, Wisconsin 53706 (United States)
  2. School of Natural Sciences, Institute for Advanced Study, Einstein Drive Princeton, New Jersey 08540 (United States)
Publication Date:
OSTI Identifier:
21039051
Resource Type:
Journal Article
Journal Name:
Physical Review. D, Particles Fields
Additional Journal Information:
Journal Volume: 77; Journal Issue: 3; Other Information: DOI: 10.1103/PhysRevD.77.035005; (c) 2008 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0556-2821
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; CERN LHC; COSMOLOGY; CROSS SECTIONS; HIGGS BOSONS; HIGGS MODEL; NONLUMINOUS MATTER; PARTICLE PRODUCTION; PHASE TRANSFORMATIONS; POTENTIALS; STANDARD MODEL; SYMMETRY

Citation Formats

Barger, Vernon, McCaskey, Mathew, Shaughnessy, Gabe, Langacker, Paul, Ramsey-Musolf, Michael J, and California Institute of Technology, Pasadena, California 91125. CERN LHC phenomenology of an extended standard model with a real scalar singlet. United States: N. p., 2008. Web. doi:10.1103/PHYSREVD.77.035005.
Barger, Vernon, McCaskey, Mathew, Shaughnessy, Gabe, Langacker, Paul, Ramsey-Musolf, Michael J, & California Institute of Technology, Pasadena, California 91125. CERN LHC phenomenology of an extended standard model with a real scalar singlet. United States. https://doi.org/10.1103/PHYSREVD.77.035005
Barger, Vernon, McCaskey, Mathew, Shaughnessy, Gabe, Langacker, Paul, Ramsey-Musolf, Michael J, and California Institute of Technology, Pasadena, California 91125. Fri . "CERN LHC phenomenology of an extended standard model with a real scalar singlet". United States. https://doi.org/10.1103/PHYSREVD.77.035005.
@article{osti_21039051,
title = {CERN LHC phenomenology of an extended standard model with a real scalar singlet},
author = {Barger, Vernon and McCaskey, Mathew and Shaughnessy, Gabe and Langacker, Paul and Ramsey-Musolf, Michael J and California Institute of Technology, Pasadena, California 91125},
abstractNote = {Gauge singlet extensions of the standard model (SM) scalar sector may help remedy its theoretical and phenomenological shortcomings while solving outstanding problems in cosmology. Depending on the symmetries of the scalar potential, such extensions may provide a viable candidate for the observed relic density of cold dark matter or a strong first order electroweak phase transition needed for electroweak baryogenesis. Using the simplest extension of the SM scalar sector with one real singlet field, we analyze the generic implications of a singlet-extended scalar sector for Higgs boson phenomenology at the Large Hadron Collider (LHC). We consider two broad scenarios: one in which the neutral SM Higgs and singlet mix and the other in which no mixing occurs and the singlet can be a dark matter particle. For the first scenario, we analyze constraints from electroweak precision observables and their implications for LHC Higgs phenomenology. For models in which the singlet is stable, we determine the conditions under which it can yield the observed relic density, compute the cross sections for direct detection in recoil experiments, and discuss the corresponding signatures at the LHC.},
doi = {10.1103/PHYSREVD.77.035005},
url = {https://www.osti.gov/biblio/21039051}, journal = {Physical Review. D, Particles Fields},
issn = {0556-2821},
number = 3,
volume = 77,
place = {United States},
year = {2008},
month = {2}
}