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**Jamahl Peavey**: *on* 1/14/13 at 18:40pm UTC, wrote Interesting

**Fred Diether**: *on* 11/22/12 at 20:01pm UTC, wrote Hi Ben, Yep, every year that passes SUSY loses more and more ground. ...

**Ben Still**: *on* 11/21/12 at 21:17pm UTC, wrote The LHCb experiment at CERN recently announced results that put the theory...

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FQXi BLOGS

July 8, 2015

Our current picture of the Universe at the smallest scale is wrapped up in the mathematics of the Standard Model of particle physics, with 12 building blocks (6 quarks and 6 leptons), four force carrying particles and the Higgs boson (see image, right). It can be used to predict the ways in which the twelve building blocks of Nature interact through the exchange of the four force carrying particles. Then there is the Higgs boson, which gives mass to all of these particles. It is known that this model isn’t the final word in our understanding of Nature and there are a number of theories which try to answer the questions the Standard Model can’t.

Supersymmetry is the poster boy of these “new physics” theories. In brief it states that every building block and force carrying particle has a supersymmetric partner called a sparticle. These sparticles have not been seen yet because they are believed to have a large mass, so you need large energies to create them because, as Einstein told us, E=mc

The LHCb experiment is designed to look for rare decay of heavy particles called B-mesons. B-mesons are pairs of quarks and anti-quarks where at least one is a bottom quark. The latest results are interested in the decay of Bs mesons; an anti-beauty and a strange quark. The result published by the experiment last week talks about the rare decay where a Bs forms a two particles called Muons (μ).

The result published by LHCb shows a high level of agreement with the standard model result of 3 parts per billion. This suggests it is unlikely that there are “new physics” routes to get from a Bs to two. This could be because LHCb have been unlucky and through nothing but pure chance seen fewer Bs -> μμ than it should have; more time and data will be the test of this. Another possible reason for the result is the current 8TeV energy of the LHC machine is not high enough to create sparticles; the good news here is the LHC will be increasing its energy to around 13TeV in 2014. Or it could be that supersymmetry is not the right route to explaining the shortcomings of the Standard Model. Either way supersymmetry still remains a theory and the standard model stands strong but time and energy may yet change all that.

--

Ben Still is a particle physicist at Queen Mary, University of London, UK.

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Hi Ben,

Yep, every year that passes SUSY loses more and more ground. IMHO, a nice theory Nature choose not to do. If we take the viewpoint that the quantum "vacuum" is a relativistic medium of fermionic pairs, then all elementary gauge bosons are merely "wavicles" of the medium. So there can't be any kind of supersymmetry between fermions and bosons. For a different perspective see my essay.

Best,

Fred

report post as inappropriate

Yep, every year that passes SUSY loses more and more ground. IMHO, a nice theory Nature choose not to do. If we take the viewpoint that the quantum "vacuum" is a relativistic medium of fermionic pairs, then all elementary gauge bosons are merely "wavicles" of the medium. So there can't be any kind of supersymmetry between fermions and bosons. For a different perspective see my essay.

Best,

Fred

report post as inappropriate

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