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Title: Revisiting the SUSY μ problem and its solutions in the LHC era

Abstract

The supersymmetry preserving mu parameter in SUSY theories is naively expected to be of order the Planck scale while phenomenology requires it to be of order the weak scale. This is the famous SUSY mu problem. Its solution involves two steps: 1. first forbid mu, perhaps via some symmetry, and then 2. re-generate it of order the scale of soft SUSY breaking terms. However, present LHC limits suggest the soft breaking scale m_{soft} lies in the multi-TeV regime whilst naturalness requires mu~ m_{W,Z,h}~ 100 GeV so that a Little Hierarchy (LH) appears with mu << m_{soft}. We review twenty previously devised solutions to the SUSY mu problem and re-evaluate them in light of whether they are apt to support the LH. We organize the twenty solutions according to: 1. solutions from supergravity/superstring constructions, 2. extended MSSM solutions, 3. solutions from an extra local U(1)' and 4. solutions involving Peccei-Quinn (PQ) symmetry and axions. Early solutions would invoke a global Peccei-Quinn symmetry to forbid the mu term while relating the mu solution to solving the strong CP problem via the axion. We discuss the gravity-safety issue pertaining to global symmetries and the movement instead toward local gauge symmetries or R-symmetries, eithermore » continuous or discrete. At present, discrete R-symmetries of order M (Z_M^R) which emerge as remnants of Lorentz symmetry of compact dimensions seem favored. Even so, a wide variety of regenerative mechanisms are possible, some of which relate to other issues such as the strong CP problem or the generation of neutrino masses. We also discuss the issue of experimental verification or falsifiability of various solutions to the mu problem. Almost all solutions seem able to accommodate the LH.« less

Authors:
; ; ;
Publication Date:
Research Org.:
Univ. of Oklahoma, Norman, OK (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP)
OSTI Identifier:
1528667
Alternate Identifier(s):
OSTI ID: 1600538
Report Number(s):
arXiv:1902.10748
Journal ID: ISSN 2470-0010; PRVDAQ; 115027
Grant/Contract Number:  
SC0009956
Resource Type:
Published Article
Journal Name:
Physical Review. D.
Additional Journal Information:
Journal Name: Physical Review. D. Journal Volume: 99 Journal Issue: 11; Journal ID: ISSN 2470-0010
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; supersymmetry; LHC; dark matter

Citation Formats

Bae, Kyu Jung, Baer, Howard, Barger, Vernon, and Sengupta, Dibyashree. Revisiting the SUSY μ problem and its solutions in the LHC era. United States: N. p., 2019. Web. doi:10.1103/PhysRevD.99.115027.
Bae, Kyu Jung, Baer, Howard, Barger, Vernon, & Sengupta, Dibyashree. Revisiting the SUSY μ problem and its solutions in the LHC era. United States. https://doi.org/10.1103/PhysRevD.99.115027
Bae, Kyu Jung, Baer, Howard, Barger, Vernon, and Sengupta, Dibyashree. Fri . "Revisiting the SUSY μ problem and its solutions in the LHC era". United States. https://doi.org/10.1103/PhysRevD.99.115027.
@article{osti_1528667,
title = {Revisiting the SUSY μ problem and its solutions in the LHC era},
author = {Bae, Kyu Jung and Baer, Howard and Barger, Vernon and Sengupta, Dibyashree},
abstractNote = {The supersymmetry preserving mu parameter in SUSY theories is naively expected to be of order the Planck scale while phenomenology requires it to be of order the weak scale. This is the famous SUSY mu problem. Its solution involves two steps: 1. first forbid mu, perhaps via some symmetry, and then 2. re-generate it of order the scale of soft SUSY breaking terms. However, present LHC limits suggest the soft breaking scale m_{soft} lies in the multi-TeV regime whilst naturalness requires mu~ m_{W,Z,h}~ 100 GeV so that a Little Hierarchy (LH) appears with mu << m_{soft}. We review twenty previously devised solutions to the SUSY mu problem and re-evaluate them in light of whether they are apt to support the LH. We organize the twenty solutions according to: 1. solutions from supergravity/superstring constructions, 2. extended MSSM solutions, 3. solutions from an extra local U(1)' and 4. solutions involving Peccei-Quinn (PQ) symmetry and axions. Early solutions would invoke a global Peccei-Quinn symmetry to forbid the mu term while relating the mu solution to solving the strong CP problem via the axion. We discuss the gravity-safety issue pertaining to global symmetries and the movement instead toward local gauge symmetries or R-symmetries, either continuous or discrete. At present, discrete R-symmetries of order M (Z_M^R) which emerge as remnants of Lorentz symmetry of compact dimensions seem favored. Even so, a wide variety of regenerative mechanisms are possible, some of which relate to other issues such as the strong CP problem or the generation of neutrino masses. We also discuss the issue of experimental verification or falsifiability of various solutions to the mu problem. Almost all solutions seem able to accommodate the LH.},
doi = {10.1103/PhysRevD.99.115027},
journal = {Physical Review. D.},
number = 11,
volume = 99,
place = {United States},
year = {Fri Jun 21 00:00:00 EDT 2019},
month = {Fri Jun 21 00:00:00 EDT 2019}
}

Journal Article:
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https://doi.org/10.1103/PhysRevD.99.115027

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