All Questions
Tagged with beyond-the-standard-model supersymmetry
47 questions
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Degrees of freedom in the early universe with MSSM?
As nicely summarized on P4 in On effective degrees of freedom in the early universe here; at high temperatures where all the particles of the Standard Model are present, we have 28 bosonic and 90 ...
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Are there enough parameters in standard model to falsify SUSY?
I know that the search for Higgs would be quite pointless if there was no estimation of its mass.
Namely the perturbative violation of unitatity, gave us an upper bound on its mass.Unitarity ...
- 1,280
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What causes running coupling constants to converge to one value at high energy?
In this article ("The coupling constants and unification of interactions", sicsmasterclasses.org) we can read:
The running coupling constants. Scientists believe that as they push the ...
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Have we ruled out the Minimal Supersymmetric Standard Model (MSSM)?
This question is inspired by a Physics Stackexchange question posted 8 years ago (The future of supersymmetry). The question that I have is very similar to the question in the above link, except that ...
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Meaning of "Minimal" in "Minimal Supersymmetric Standard Model"
From what I am aware of, the LHC has ruled out the Minimal Supersymmetric Standard Model (MSSM), or at least highly constrain it. "Minimal" means that supersymmetry is introduced into the ...
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Future Plans for Searches for Supersymmetry in the LHC
Due to the failure of the LHC to discover supersymmetry so far (July 2021), the simplest and the likeliest supersymmetric models (e.g. the MSSM) have been ruled out, and the confidence in ...
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Has the ${\cal N}=1$ Minimal SUSY standard model been ruled out by the nature? [duplicate]
Question: Has the ${\cal N}=1$ Minimal SUSY standard model (MSSM) been ruled out by the nature? What are the natural constraints that ruled out such ${\cal N}=1$ MSSM?
In particular, the ${\cal N}=1$...
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Terminology about chiral supermultiplet and vector supermultiplet
I have an issue with the terminology about chiral supermultiplet and vector supermultiplet.
In the Pierre Ramond's Journeys Beyond The Standard Model p.286, he used the phrase
chiral vector multiplet ...
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Why are explicit mass terms allowed for sfermions like higgsinos and gauginos in the MSSM Lagranian if explicit fermionic mass terms are prohibited?
In Martin's SUSY Primer, he claims:
For the higgsinos and gauginos, [the ability to have a mass term]
follows from the fact that they are fermions in a real representation
of the gauge group.
As I ...
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Electron as Superpartner of Higgs!
Can we identify Higgs as a superpartner of the electron in a massless case? We know, superpartners have the same mass so of course, we can't and one argument we can make there are two Higgs doublets ...
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Can Peccei-Quinn $U(1)$ symmetry be a $U(1)_R$ symmetry in supersymmetric models?
Is there a possibility that the global $U(1)$ of Peccei-Quinn theory can be identified with $U(1)_R$ symmetry in supersymmetric extensions of the Standard Model?
- 2,736
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Why supersymmetry can only be verified in high energy level?
I'm wondering why supersymmetry can only be verified in high energy level,can we check supersymmetry in low energy physics?
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How did Supersymmetry (incorrectly) predict the mass of the Higgs Boson?
In an article by CERN states
The minimal version of supersymmetry predicts that the Higgs boson mass should be less than 120-130 GeV
How was this conclusion reached? I could not find any answers on ...
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300
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How SUSY solves the hierarchy problem?
I am struggling to understand the argument for why the introduction of a stop in SUSY can solve the hierarchy problem. The quadratic divergence from the top loop in the higgs mass calculation gives a ...
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What would we have to find to prove supersymmetry correct? [closed]
What would we have to find to prove that supersymmetry is true?
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Why the SUSY particles of fermions have spin 0 but not 1? [duplicate]
As the supersymmetric particles have spin which differs by half, why cant the superpartners have a spin = 1. Why does it always have to be 0?
- 468
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Layman's questions about Supersymmetry
Please help me with two very silly questions.
Assuming supersymmetry is correct, why don't we observe the superpartners of the Standard Model particles at ordinary energies? Why do we have to search ...
- 12.3k
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How the hierarchy of forces is explained by Supersymmetry?
The hierarchy problem is often stated in two ways:
First, the divergent corrections to the Higgs bare mass,
second, why is gravity so much weaker than the other three forces.
The solution to the ...
- 468
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3
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594
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How is there no hierarchy problem without UV cutoff?
I can understand the quadratic divergent corrections to Higgs bare mass which is referred to as the hierarchy problem.
But I don't understand how there won't be any hierarchy problem if we do not ...
- 468
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95
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Dark matter and supersymmetric particles
Is there a possibility to consider supersymmetric particles of fermions and bosons as the unknown dark matter?
- 260
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What is the difference between supersymmetry and MSSM?
What is the difference between supersymmetry and MSSM? Please explain in a simple language i am just a beginner of supersymmetry
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Like the Higgs sector of the standard model, is there a SUSY sector which is also such a sector?
This question arose from an application of the virial theorem that showed how Bose-Einstein condensates of astrophysical dimension could arise from condensing clouds of normal phase bosons. If these ...
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What is the status of SUSY GUTs in 2018?
Grand unification theories (GUTs) generically predict proton decay, and many of them have been under pressure for decades as experiments have failed to see it. I don't think there have been recent ...
- 105k
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Why is it assumed supersymmetry in nature is ${\cal N}=1$?
It is often presumed that if supersymmetry exists then there will be a single supersymmetry (${\cal N}=1$). Why do we assume this? What is wrong with additional supersymmetries (${\cal N}>1$)? For ...
user84158
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Which extensions of the Standard model have the inflaton candidates?
Like dark matter and dark energy, there is no candidate of inflaton in the Standard Model (SM) of the particle physics but its various extension does have candidates of dark matter. Does the minimal ...
- 27.2k
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What dictates the Higgs potential of the Standard model?
As far as I know, there is no convincing answer for why does the Higgs potential has a 'Mexican hat' shape. Apart from Lorentz invariance and gauge invariance, the Higgs potential of the Standard ...
- 27.2k
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70
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'Modern' Introduction to or Summary of SUSY and BSM? [duplicate]
The title really says it all. I am looking for a (preferably friendly and compact) modern introductory text on supersymmetry (SUSY) and beyond-the-standard-model (BSM) particle physics.
As a little ...
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Is spacetime supersymmetry realized at TeV scale? and more questions on supersymmetry [closed]
Is spacetime supersymmetry realized at TeV scale?
If so, what is the mechanism of supersymmetry breaking?
Does supersymmetry stabilize the electroweak scale, preventing high quantum corrections?
...
user143869
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Is there an upper-limit for sparticle masses?
I realize there are many flavors to supersymmetry theory but can the LHC reach the energy and luminosity levels past which if sparticles are not detected then supersymmetry can definitively be ruled ...
user86411
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How does gauge invariance protect the SM gauge boson masses in SUSY from divergent radiative corrections?
The W and Z gauge bosons receive radiative corrections in loop from the heavy SUSY scalars. There is an argument using gauge invariance which explains how the masses remains protected. I am not able ...
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Supersymmetry and grand unification
I came across this diagram in my introductory particle physics class.
Given the fact that SUSY can make the plot look suspiciously nice, what can we do with it? Also, electromagnetism has been ...
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878
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Supersymmetry as a solution of hierarchy problem
Hierarchy problem is the statement of why the weak force is much stronger than gravity.
In terms of coupling constant, weak force (Fermi coupling) is much larger than gravity (Newton's constant).
I ...
- 3,662
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369
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Soft SUSY breaking fermion mass terms in MSSM for matter fields
In the Minimal Supersymmetric Standard Model, the chiral fermion fields (the Higgsinos) don't have any soft SUSY breaking mass terms and soft SUSY breaking trilinear interactions while their scalar ...
- 5,287
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Signs of supersymmetry and thus dark matter at CERN
The Large Hadron Collider at CERN has just re-started after a two year pause and is now running at unprecedented levels of 6.5 TeV, with collisions that will release up to 13.5 TeV. With this increase ...
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With the LHC about to restart as max energy, are there absolutely no hints or tantalizing signs of Supersymmetry in previous data?
Over the last couple of years I've seen several articles talk about hints or bumps in the data that might point to Supersymmetry. An article in NewScientist from Summer 2012 discussed the discovery of ...
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Viability of a Fayet Iliopoulos term in the MSSM
Why is a Fayet-Iliopoulos term $-kD$ irrelevant or subdominant in the in the MSSM (Minimal Susy Standard Model)?
According to Martin (A Supersymmetry Primer, p.70) it's because squarks and sleptons ...
- 5,093
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How well theoretically motivated is $R$-parity?
I understand that $R$-parity is empirically necessary in order to avoid proton decay, but theoretically I'm worried that it amounts to a tune or "hack" that spoils the naturalness argument for ...
- 7,488
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Evaluation of the anomalous dimensions of fields in SUSY $SU(5)$
The general formula for the anomalous dimension can be found in Martin΄s review
article (hep-ph/9709356), on page 62 relation (6.5.4). In the case of $SU(5)$ and especially in the paper of Kobayashi, ...
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How can the mass of Higgs give preference to SUSY vs multiverse?
According to the documentary Particle Fever, the precise value of the Higgs boson's mass could give more credence to either SUSY or multiverse theories. If the mass had been 115 GeV or below SUSY ...
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Supersymmetry vs multiverse
I'm a complete noobe in physics and quite honestly need help. My question is simple, based on CERN's tentative findings stating the Higgs boson at a mass of ~125 GeV: Is the physics community leaning ...
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488
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why do the electroweak vacuum have to be charge and color neutral?
My question is why the electroweak vacuum of the Standard Model have to electroweak charge and QCD color neutral? What goes wrong if electroweak vacuum has either non-zero charge or color quantum ...
- 351
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Neutrino Nuclei Coherent scattering and the Dark Matter lower wall
Suppose that current and new forthcoming dark matter direct detection experiments find no evidence of Dark matter events and exclude interactions of hypothetical DM particles (like LSP or similar) in ...
- 6,727
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Feynman Diagrams in 2 component notation
When using two component notation people often prefer to refrain from using arrows in Feynman diagrams to denote charge flow as is done in four-component notation. Instead, if understand correctly, ...
- 9,005
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Evidences against Supersymmetry [closed]
Recently, some experiments show that the supersymmetry is not realised by Nature according to the simple models that we currently have. Nevertheless, it is far from saying that the "game is over" as ...
- 1,704
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${\cal N}=1$ vs ${\cal N}=2$ supermultiplets
I read that the chiral nature of SM fields is an indication that they must be realized in a ${\cal N}=1$ supermultiplet (and not ${\cal N}=2$). I don't quite understand how so. Please enlighten.
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Remaining Potential Experimental Particle Physics Discoveries at the TeV Scale?
With the discovery of the Higgs Boson, some have been calling it the end of experimental particle physics for our generation, due to the fact that all of the particles predicted by the standard model ...
- 4,246
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Why are the third generation superpartners lighter than the other sfermions in mSUGRA?
In the mSUGRA (minimal supergravity) breaking scenario, the stop particle typically appears at energies reachable at the LHC. Other sfermions, notably the partners of up, down, strange and charm are ...
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