The minimal supersymmetric standard model mssm is a theory that realizes supersymmetry with the least amount of new particles and interactions compared to the standard model, and is the theory we will focus on in the rest of this paper. The lightest supersymmetric particle is a promising although not the unique candidate for the dark matter 16,17. This lower limit was particularly low for the complex minimal supersymmetric standard model, since higgs bosons described by this theory can be trickier to produce in colliders. However such a superpotential will contain terms breaking lepton and baryon number. We first motivate the particle content of the theory by examining the quantum numbers of the known standard model particles and by the requirement of anomaly cancellation. The first step towards trying to build a more complete theory is the minimal supersymmetric standard model mssm.
This is the most minimal extension to the standard model that respects an additional spacetime symmetry, called supersymmetry. Supersymmetry pairs bosons with fermions, so every standard model particle has a superpartner yet undiscovered. Soft supersymmetry breaking and the supersymmetric. The level of the notes is introductory and pedagogical. Relic density of dark matter in the nextto minimal supersymmetric standard model to cite this article. Box 9500, 2300 ra leiden, the netherlands september 16, 2016 abstract symmetry breaking in realistic supersymmetric theories has proven to be di cult without the introduction of explicit supersymmetry breaking terms. Aps we reexamine the stop coannihilation scenario of the minimal supersymmetric standard model, wherein a binolike lightest supersymmetric particle has a thermal relic density set by coannihilations with a scalar partner of the top quark in the early universe. Supersymmetrize the intermediate legs of this process 3. The main symmetry content is described by a slavnovtaylor identity sr 0, 1 where f denotes the generating functional of the oneparticle. Standard model, basic supersymmetry algebra and its representations are considered as prerequisites.
The non minimal supersymmetric standard model nmssm 1, where the particle content of the minimal supersymmetric standard model mssm 2 is extended by the addition of a gauge singlet chiral super. Pdf oneloop minimization conditions in the minimal. The minimal supersymmetric standard model with cp phases. Neutron and lepton electric dipole moments in the minimal. Once the particle content is fixed we can write down the most general renormalizable superpotential. References martin, a supersymmetric primer, hepph9709356 last update peskins lecture notes. Tauonic b decays in the minimal supersymmetric standard model. We therefore study a general model with nonuniversal soft breaking terms constrained by vacuum stability and the experimental upper bound on the mass difference of the neutral charm mesons. We therefore study a general model with nonuniversal. Pierce stanford linear accelerator center stanford university stanford, california 94309, usa jonathan a. On the other hand, no direct evidence of new physics beyond the standard model has been found, yet. Mssm is the minimal supersymmetrical model as it considers only the minimum number of new particle states and new interactions consistent with phenomenology.
Minimal supersymmetric standard model 15 how to discover susy today. We first motivate the particle content of the theory by examining the quantum numbers of the known standard model particles and by the requirement of anomaly. Search for minimal supersymmetric standard model higgs. Maarten boonekamp, marcela carena, seong youl choi.
Cosmology of the nexttominimal supersymmetric standard model. In this thesis, we focus on the behaviour of these types of higgs bosons and, in particular, how they would interact with eachother, and we. The mssm removes dangerous contributions to the higgs mass provided that the superpartners of the known particles are not too far above the weak scale. A study of lepton flavour violating process h l in minimal. Topics covered include field content of the mssm, electroweak symmetry breaking, the. Still, there are several reasons to believe that new physics should. This theory annexes a new symmetry, this is reason for the name of the theory. Flavour violation within the minimal supersymmetric. The status of the minimal supersymmetric standard model and beyond. As an explicit model, the minimal supersymmetric standard model mssm is studied in this paper. Supersymmetry and the minimal supersymmetric standard model. Correspondingly, therefore, quite accurate calculations of the physical observables are required. Theoretical, experimental, and cosmological constraints are studied.
These new particles would solve a major problem with the standard model fixing the mass of the higgs boson. It predicts a partner particle for each particle in the standard model. In the most general framework with minimal eld content and rparity conservation, the mssm is a 124parameter model henceforth called mssm124. The minimal supersymmetric standard model mssm is an extension to the standard model that realizes supersymmetry. The topics covered include particle content, structure of.
The resulting e ective eld theory is therefore a twohiggsdoublet model and the. If the theory is correct, supersymmetric particles should appear in. Clearly, the basic structure of the symmetry identities in the mssm can be ob tained by combining the results for the standard model 2 and for general supersymmetric yang mills theories 3,4. Supersymmetry is an extension of the standard model that aims to fill some of the gaps. The higgs sector of the complex minimal supersymmetric. The status of the minimal supersymmetric standard model.
We have calculated cross sections and decay branching ratios at the oneloop level using the gracesusyloop system 59. The minimal supersymmetric standard model mssm construction. The simplest in this species is the minimal supersymmetric standard model mssm 2, 3. For the sequential standard model, a z the minimal supersymmetric standard model mssm ssm mass up to 1. I analyze two limiting cases of the model, characterized.
The minimal supersymmetric standard model mssm csaba cs aki 1 center for theoretical physics laboratory for nuclear science and department of physics massachusetts institute of technology cambridge, ma 029, usa abstract the structure of the mssm is. In short, the mssm predicts that each standard model particle has a supersymmetric counterpart with. Muoniumantimuonium oscillations in an extended minimal. Particle spectrum in the nonminimal supersymmetric. Although neutralino dark matter has been extensively examined in the framework of the minimal supersymmetric standard model mssm 2, this is not the case for the nextto minimal supersymmetric standard model nmssm 3. In the next section, i will list several problems apparent in the sm which prohibits it from laying claim to being the ultimate theory.
There are no particles in the sm that can be superpartners susy associates known bosons with new fermions and known fermions with new bosons even number of the higgs doublets min 2. Decide whether you want the susy particles to be produced in pairs or not i. Searching for beyond the minimal supersymmetric standard. Particles and fields 599 march 1998 with 12 reads how we measure reads. An acceptable phenomenology occurs only at exceptional points and small perturbations around. Gauge supermultiplets in the minimal supersymmetric standard model. Electron anomalous magnetic moment experiments majorana fermions minimal supersymmetric standard model muoniumanitmuonium time evolution muoniumantimuonium oscillation neutrino masses and mixings see. Damtp201442 ific1447 higher order corrections and uni. Minimal supersymmetric standard model yasaman farzan ipm, tehran. Standard model, where supersymmetric masses lie below a few tev, provides simple example of successful gauge.
Renormalization group invariants in the minimal supersymmetric. It was proposed to solve, amongst other things, the hierarchy problem. Quest for unification observational motivation dark matter candidate neutrino mass. Flavour violation within the minimal supersymmetric standard model the minimal supersymmetric standard model mssm is a quantum field theory which extends the standard model. The gluino sector contains a phase j3 in the gluino mass term. Standard model, basic supersymmetry algebra and its. The nextto minimal supersymmetric extension of the standard model nmssm is one of the most favored supersymmetric models.
Matchev and renjie zhang department of physics and astronomy johns hopkins university 3400 n. Phenomenological viability of neutralino dark matter in. We study new physics effects on b decay processes including a final. Muoniumantimuonium oscillations in an extended minimal supersymmetric standard model. Minimal supersymmetric standard model now let us turn to the model realizing the idea of supersymmetry. We first motivate the particle content of the theory by examining the quantum numbers of the known standard model particles and by the requirement of. The minimal supersymmetric standard model mssm michael du rr march 30, 2010 1 particle content names spin 0 spin 12 su3 c. The minimal supersymmetric standard model mssm with universal soft breaking terms has a negligible effect on the rare cu.
This chapter examines the minimal supersymmetric standard model mssm, which is the simplest extension of the standard model sm incorporating susy. In the nextto minimal supersymmetric standard model nmssm 1, an additional gauge singlet super. After an introduction to the model, the higgs sector and the neutralino sector are discussed in detail. In section 3, i will try to provide some motivation as to why the next step should be a supersymmetric extension for the sm.
Cosmology of the nextto minimal supersymmetric standard model. The minimal supersymmetric extension of the standard model mssm consists of taking the. The first realistic supersymmetric version of the standard model was proposed in 1977 by pierre fayet and is known as the minimal supersymmetric standard model or mssm for short. Quark sector 88 540 90 electroweak interactions of hadrons 83, 89 546 91 neutrino masses 89 555 92 solitons and monopoles 84 558 93 instantons and theta vacua 92 571 94 quarks and theta vacua 77, 83, 93 582 95 supersymmetry 69 590 96 the minimal supersymmetric standard model 89, 95 602 97 grand. Related content dark matter in a constrained nextto minimal supersymmetric standard model c hugonie, g. Oneloop effects of minimal supersymmetric standard model. Only one fermionic generator n 1 for the supersymmetry. Further aspects of dark matter can be found in ref. A description of the galactic center excess in the minimal. Renormalization of the minimal supersymmetric standard model.
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