Saturday, June 23, 2018

Is Supersymmetry Dead or Dying? I say no. We don't even know what susy predicts.

Supersymmetry has not been discovered at the LHC, despite a great deal of work.  My point of view, however, is that we have not figured out what supersymmetry predicts.  So the searches for it at the LHC have not been looking for the right things.

It has been known for at least forty years that a simple kind of model with susy, based on the well tested standard model of weak electromagnetic and strong interactions, without susy, just does not work.  That kind of model predicts that there should be superpartners with low mass, and they are not there.  It also predicts the cosmo constant to be 10^120 times too big.  Anyway it is very hard to get spontaneous breaking of susy in a simple model.

The solution offered for this is to hypothesize an undetectable and invisible `hidden sector' where Susy gets spontaneously broken, and then add a few hundred terms to the action that explicitly break susy, and then make the claim that this is still susy, and that the new breaking is somehow created by an unknown mechanism from the invisible sector!!!

But it is not susy at all.  It is like the Emperor's new clothes-- you can't see them.

This preposterous idea is called the Minimal Supersymmetric Standard Model (the MSSM).  There are many papers on it, and it is also described on the Particle Data Group website.

On the web one sees all sorts of comments that susy is dead, because this silly ugly MSSM model is not working.  The worst result we could get would be if this silly, very unsatisfactory, model did work. Fortunately, even with all the parameters, none of the predictions are true. 

So what does SUSY predict, if we do it right?  That is the interesting question.  I do not claim to have the answer.  There are papers coming out these days that are at least trying to think about the problem though. 

Saturday, April 8, 2017

My work on Cybersusy is now largely irrelevant, I think.
What survives is a thing that I am calling Suppressed Susy.  I guess I should change the name of this blog.

Sunday, November 1, 2015

I have found a way to get rid of the tachyon problem in cybersusy!

I spent about six months recently at the Mathematics Institute in Oxford, England.  While there I wrote three papers, summarizing results largely obtained the previous year. They are all on the archive arXiv now and the first two are published in Phys. Lett. B.,  which is open access.

The first paper is
The second  paper is
I am still reviewing what I to do with the third paper, which is pretty technical.

Soon I will have time to try to figure out whether the new action that arises from the first of these papers could possibly give rise to Double Obstructions as discussed in the second paper, using the results of the third paper to try to find an interacting action.

The purpose of all this is to find an alternative way to split susy mass multiplets that might get around the terrible phenomenological problems that susy currently experiences. If this works, then the bunch of largely unpublished papers on cybersusy that I have put on arXiv since 2000 might have a chance to be relevant to observable physics, once they are brought up to date with these new results from the above three papers.  Anyway that is the current plan.

Saturday, June 14, 2014

I have been stuck on a problem for several years.  The problem was that all my efforts at Cybersusy yielded tachyons, so that the method, though I am pretty sure it broke Supersymmetry, was totally flawed and did not yield any results testable by experiment.  I think that might be changing soon.  So I am trying to figure out how to use this blog, and intend to even open it up for comments, supposing that anyone wants to make one.

Saturday, February 21, 2009

My current Interest is cybersusy

My current research interest is cybersusy, which is a method that gives rise to a new mechanism for supersymmetry breaking in the standard model.

Cybersusy has some very nice features. In the first place it arises from the supersymmetric standard model. It just has not been noticed before, because it is very well hidden in the cohomology of the theory, which is hard to compute. It gives rise to a scheme of supersymmetry breaking which is proportional to gauge symmetry breaking. The vacuum energy remains zero after supersymmetry breaking, and there are no mass sum rules. The application of this to the leptons in the standard supersymmetric model is consistent with the presently known spectrum of leptons--in other words all the superpartners of the leptons can be made much heavier than the electron, muon and tau, and similarly for the neutrinos.

The reason these are nice features is that other supersymmetry breaking mechanisms suffer problems that are cured by cybersusy.

The most popular method currently is to simply start with the standard supersymmetric model and then break supersymmetry explicitly by adding mass terms that break supersymmetry `softly'. The trouble with this is that there is no known theoretical reason to do this. We do it because if we do not do it, the theory does not agree with experiment. Also it flies in the face of the reason for looking at supersymmetry in the first place, because the action one uses is simply not supersymmetric once the new terms are added.

Another method, which was originally considered promising, many years ago, was the method of introducing spontaneous breaking of supersymmetry by choosing the superpotential in some clever way. The problem here is that before spontaneous breaking of supersymmetry the vacuum energy is zero, and after spontaneous breaking of supersymmetry the vacuum energy is ridiculously huge, which would give rise to a ridiculously huge cosmological constant. Also, spontaneous breaking tends to be inconsistent with experiment anyway, because some of the superpartners get masses that are too small, as a result of mass sum rules.

Cybersusy arises from the construction of an effective action. This action is motivated by the BRS cohomology for supersymmetry applied to the standard supersymmetric model.

One of the most interesting features of the BRS cohomology of the Wess Zumino model is that there is a constraint equation which must be satisfied in order that certain composite dot-spinor operators transform as effective superfields.

Solutions of these constraints in general seem hard to find. However the supersymmetric standard model provides nice solutions to these constraints, and these solutions are familiar particles such as the supersymmetric generalization of the baryons constructed from three quarks.

The existence of these solutions depends on some of the weird features of the standard model, in particular it depends on the left right assymetry of the quark and lepton content of the standard model, on the three generations, on the direct product structure of the gauge groups SU(3) X SU(2) X U(1), and also on the spontaneous breaking of gauge symmetry. So it appears as though the standard model is `rigged' to provide nice solutions to the constraint equations, and in turn this is the origin of supersymmetry breaking. This is discussed in Cybersusy V in a fairly general way.

The essentials are set out in Cybersusy I which is Supersymmetry Breaks when Gauge Symmetry Breaks: Cybersusy I .

This is retrievable using arXiv:0808.0811 [ps, pdf, other].

Then there are four other papers that follow: Cybersusy II,III,IV and V. They can be found below:

arXiv:0808.3749 [ps, pdf, other]

iv:0808.2301 [ps, pdf, other]

iv:0808.2276 [ps, pdf, other]

arXiv:0808.2263 [ps, pdf, other]

Many of my earlier papers on supersymmetry and anomalies were a search for anomalies that corresponded to the cohomology of supersymmetry that was set out in two papers published in 1995 in Communications in Mathematical Physics. Those two papers are correct. However many of the papers after that contained new results and also speculation about the existence of supersymmetry anomalies. The speculations, I now believe, are largely wrong. The anomalies do not exist--they appear as mass dependent cybersusy algebra modifications. These are similar algebraically to anomalies, but they act quite differently.

The history of these errors, and my current view of the correct situation, are set out in the first cybersusy paper (I above).

Older Papers on arXiv

Here are some older papers on arXiv:
1. arXiv:hep-ph/9309254 [ps, pdf, other]
Title: On-shell Supersymmetry Anomalies and the Spontaneous Breaking of Gauge Symmetry
Authors: J. A. Dixon
Comments: 69 pages, CTP/TAMU-46/93
Subjects: High Energy Physics - Phenomenology (hep-ph); High Energy Physics - Theory (hep-th)
2. arXiv:hep-th/9308088 [ps, pdf, other]
Title: The Search for Supersymmetry Anomalies--Does Supersymmetry Break Itself? --
Authors: J. A. Dixon
Comments: Talk given at the HARC conference on `Recent Advances in the Superworld', LaTeX 15 pages, CTP-TAMU-45/93
Subjects: High Energy Physics - Theory (hep-th); High Energy Physics - Phenomenology (hep-ph)
3. arXiv:hep-th/9308013 [ps, pdf, other]
Title: Higher Spin BRS Cohomology of Supersymmetric Chiral Matter in D=4
Comments: 15 pages, CPT-TAMU-20/93
Journal-ref: Commun.Math.Phys.171:459-474,1995
Subjects: High Energy Physics - Theory (hep-th)
4. arXiv:hep-th/9304035 [ps, pdf, other]
Title: BRS Cohomology of the Supertranslations in D=4
Comments: 14 pages, CTP-TAMU-13/93
Journal-ref: Commun.Math.Phys.172:1-12,1995
Subjects: High Energy Physics - Theory (hep-th)
5. arXiv:hep-th/9210092 [ps, pdf, other]
Title: A Natural Mechanism for Supersymmetry Breaking with Zero Cosmological Constant (Minor corrections of some formulae, no substantial change)
Authors: J. A. Dixon
Comments: 15 pages, CTP-TAMU-69/92
Subjects: High Energy Physics - Theory (hep-th); High Energy Physics - Phenomenology (hep-ph)
6. arXiv:hep-th/9208055 [ps, pdf, other]
Title: Putting String/Fivebrane Duality to the Test
Comments: 14 pages, CERN TH-6614/92, CTP-TAMU 60/92
Journal-ref: Phys.Rev.Lett.69:3009-3012,1992
Subjects: High Energy Physics - Theory (hep-th)
7. arXiv:hep-th/9206082 [ps, pdf, other]
Title: BRS Operators and Covariant Derivatives in Loop Space for P-Branes Coupled to Yang-Mills
Authors: J. A. Dixon
Comments: 21 pages, CTP-TAMU-50/92
Journal-ref: Nucl.Phys.B407:73-87,1993
Subjects: High Energy Physics - Theory (hep-th)
8. arXiv:hep-th/9205099 [ps, pdf, other]
Title: Chern-Simons Forms, Mickelsson-Faddeev Algebras and the P-Branes
Comments: 11 pages, CTP-TAMU-45-92, (Correction of some minor sign errors and typos)
Journal-ref: Phys.Lett.B296:28-32,1992
Subjects: High Energy Physics - Theory (hep-th)
9. arXiv:hep-th/9201019 [ps, pdf, other]
Title: The Coupling of Yang-Mills to Extended Objects
Comments: 14 Pages
Journal-ref: Phys.Lett.B279:265-271,1992
Subjects: High Energy Physics - Theory (hep-th)

More recent papers on arXiv

Here are some more recent papers:
1. arXiv:0808.3749 [ps, pdf, other]
Title: A supersymmetric version of the quark model, and supersymmetry breaking for the Leptons, Baryons and Hadronic Mesons: Cybersusy V
Authors: John Dixon
Comments: 37 pages
Subjects: High Energy Physics - Theory (hep-th)
2. arXiv:0808.2301 [ps, pdf, other]
Title: Detailed Calculations of the Mass Spectrum for the Leptons after Supersymmetry Breaking in the Supersymmetric Standard Model: Cybersusy IV
Authors: John Dixon
Comments: 55 pages
Subjects: High Energy Physics - Theory (hep-th)
3. arXiv:0808.2276 [ps, pdf, other]
Title: Some Composite Hadrons and Leptons which induce Supersymmetry Breaking in the Supersymmetric Standard Model: Cybersusy III
Authors: John Dixon
Comments: 30 pages
Subjects: High Energy Physics - Theory (hep-th)
4. arXiv:0808.2263 [ps, pdf, other]
Title: Introduction to the BRS Cohomology of the Massless Wess Zumino Model: Cybersusy II
Authors: John Dixon
Comments: 47 pages
Subjects: High Energy Physics - Theory (hep-th)
5. arXiv:0808.0811 [ps, pdf, other]
Title: Supersymmetry Breaks when Gauge Symmetry Breaks: Cybersusy I
Authors: John Dixon
Comments: 41 pages
Subjects: High Energy Physics - Theory (hep-th)
6. arXiv:hep-th/0601145 [ps, pdf, other]
Title: BRS Cohomology, Composite Operators and the Supersymmetric Standard Model
Authors: John Dixon
Comments: 5 pages, typos corrected, obscurities clarified
Subjects: High Energy Physics - Theory (hep-th)
7. arXiv:hep-th/0303145 [ps, pdf, other]
Title: Composite Operators, Supersymmetry Anomalies and Supersymmetry Breaking in the Wess-Zumino Model
Authors: John Dixon
Comments: 130 pages, 6 diagrams, 56 tables
Subjects: High Energy Physics - Theory (hep-th)
8. arXiv:hep-ph/9311305 [ps, pdf, other]
Title: Supersymmetry Anomalies, the Witten Index and the Standard Model
Authors: John Dixon
Comments: 13 pages, CTP-TAMU-47/93
Subjects: High Energy Physics - Phenomenology (hep-ph); High Energy Physics - Theory (hep-th)