Next-to-Minimal Supersymmetric Standard Model

Next-to-Minimal Supersymmetric Standard Model
Name	Next-to-Minimal Supersymmetric Standard Model
Acronym	NMSSM
Field	Particle physics
Introduced	1980s
Proponents	Howard Georgi, Mihail Chertok

Next-to-Minimal Supersymmetric Standard Model The Next-to-Minimal Supersymmetric Standard Model is an extension of the Standard Model and the Minimal Supersymmetric Standard Model that introduces a gauge-singlet superfield to address the mu problem and modify the Higgs boson sector. It aims to reconcile collider results from Large Hadron Collider searches with naturalness criteria discussed in literature by groups at CERN, Fermilab, and DESY. The framework is studied in contexts connected to predictions tested by collaborations such as ATLAS, CMS, LHCb, BaBar, and Belle II.

Introduction

The model supplements the particle content of the Minimal Supersymmetric Standard Model with a singlet chiral superfield S, altering couplings studied at LEP, Tevatron, and SLAC National Accelerator Laboratory. The NMSSM has motivated analyses by theorists from institutions including Princeton University, Harvard University, Massachusetts Institute of Technology, University of Cambridge, and University of California, Berkeley. Phenomenological work intersects with programs at IN2P3, KEK, TRIUMF, Brookhaven National Laboratory, and Lawrence Berkeley National Laboratory.

Theoretical Framework

The Lagrangian extends the Supersymmetry-inspired superpotential of the Minimal Supersymmetric Standard Model by terms involving the singlet S and Yukawa-like couplings analogous to those in Yukawa coupling studies at Stanford University and Caltech. The model exploits symmetries explored in papers from Institute for Advanced Study and Max Planck Institute for Physics, and its renormalization group running ties to calculations performed by groups at CERN Theory Division and Institut des Hautes Études Scientifiques. Gauge interactions reference the SU(3) × SU(2) × U(1) structure familiar from works at Imperial College London and ETH Zurich. The superpotential parameters and soft-breaking terms are constrained by techniques used at SLAC, INFN, Sorbonne University, and University of Oxford.

Higgs Sector and Phenomenology

Adding S leads to an enriched scalar potential with additional CP-even and CP-odd states studied in analyses conducted at CERN, Fermilab, and DESY. Detailed fits against the 125 GeV Higgs boson signal reported by ATLAS and CMS involve collaborations with theorists from University of Tokyo, Seoul National University, University of Melbourne, and University of Amsterdam. Precision electroweak tests reference results from LEP and SLC, while flavor constraints compare to data from BaBar, Belle, LHCb, and CLEO. Studies of mass matrices use computational tools related to packages developed at University of Durham, University of Southampton, Pennsylvania State University, and University of Illinois Urbana-Champaign.

Supersymmetry Breaking and Soft Terms

Soft supersymmetry-breaking parameters in the NMSSM are explored in mediation schemes discussed in the literature from Stanford Linear Accelerator Center, Brookhaven National Laboratory, and Los Alamos National Laboratory. Gravity-mediated, gauge-mediated, and anomaly-mediated scenarios connect to models developed at University of Chicago, Rutgers University, University of Michigan, and University of Texas at Austin. The role of trilinear A-terms and scalar mass terms reflects analyses from NORDITA, IPMU, Kavli Institute for the Physics and Mathematics of the Universe, and Perimeter Institute. Renormalization effects tie to research from SLAC, CERN, and Max Planck Institute for Physics.

Collider Signatures and Experimental Constraints

Collider phenomenology includes additional Higgs bosons, modified neutralino and chargino spectra, and possible displaced vertices explored by experimental groups at ATLAS, CMS, LHCb, and CDF. Searches constraining parameter space derive from results at Tevatron, LEP, and SLC and are interpreted using frameworks from Global Analysis of Particle Physics teams at University of Edinburgh, University of Glasgow, University of Warwick, and King's College London. Detector-level studies reference performance reports from CERN, Fermilab, KEK, and DESY. Statistical techniques borrow methodology from collaborations with ATLAS Statistical Committee, CMS Statistics Committee, Particle Data Group, and institutions like Oak Ridge National Laboratory.

Cosmological and Astrophysical Implications

The NMSSM alters dark matter candidates via singlino admixtures in the neutralino sector, relevant to searches by Planck Collaboration, WMAP, Fermi Gamma-ray Space Telescope, and AMS-02. Early-universe implications are compared with inflationary and freeze-out scenarios studied at Princeton University, Harvard-Smithsonian Center for Astrophysics, Max Planck Institute for Astrophysics, and Kavli Institute for Cosmology. Indirect detection constraints connect to telescopes such as H.E.S.S., VERITAS, MAGIC, and IceCube, and direct detection experiments like LUX, XENON, PandaX, and SuperCDMS inform viable parameter regions. Baryogenesis-related mechanisms reference work from CERN Theory Division and University of Copenhagen.

Variants and Extensions

Extensions include the scale-invariant NMSSM, models with extra U(1)' gauge symmetries akin to proposals at University of Southampton and Universidad Autónoma de Madrid, and embeddings in grand unified theories considered at University of Bonn, University of Paris-Saclay, University of Pisa, and University of Padua. String-theoretic and extra-dimensional realizations have been discussed by researchers at Institute for Advanced Study, Harvard University, Caltech, and Perimeter Institute. Phenomenological cousins appear in literature alongside Next-to-Minimal models studied at CERN and in effective field theory programs at SLAC and DESY.

Category:Supersymmetric models