# Recent Higgs boson observation and credibility of superstring theories

Data are coming in, and it seems that recent Higgs boson observation is eliminating many SUSY models. If so, what is happening to superstring theories, like M-theory?

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There's no problem neither for SUSY nor for ST with the higgs that is found, on the contrary ... ;-). You seem to have completely wrong informations. –  Dilaton Nov 28 '12 at 14:00
No.. discovery itself isn't the problem, but the data... –  DOT Nov 28 '12 at 14:03
No, you are wrong. See for example this. And the data, meaning the low mass of the higgs discovered, point to the fact that SUSY (or something that does a similar good job) is even NEEDED to stabilize the higgs. I'm really wondering from what sources you take your informations, they are completely wrong. –  Dilaton Nov 28 '12 at 14:06
@Dilaton: I hope you're not implying that Dorigo doesn't know what he's talking about. He's an excellent experimentalist, and he's quite right to say that the vanilla Standard Model does a good job of fitting the data we have right now. –  user1504 Nov 28 '12 at 17:08
I would like to stress that all the exclusions of this that and the other are at very low significance, one or two sigma, in contrast with the demands for discovery ( five sigma). Exclusion regions are a safe game experimental physicists and phenomenologists play when they have worked hard and found nothing significant. They have to publish something, theseis are hanging on the publication etc. –  anna v Nov 28 '12 at 18:10

The short answer is that the TeV scale data we are getting at LHC doesn't tell us anything about string theory. Which is too bad for string theorists, because they had high hopes.

They had high hopes for the following reason: If we had found that TeV scale physics is governed by a supersymmetric extension of the Standard Model, we would have strong reason to suspect that the effective field theory which incorporates gravity and the Standard Model is actually a supergravity theory. Basically, we know that we live in a curved spacetime, and the only natural way to get a global supersymmetry in this situation is to have local supersymmetry, which implies supergravity. This is pretty exciting, because all of the known supergravity theories are low energy limits of string theory.

Unfortunately, not finding supersymmetry at $1$ TeV doesn't tell us that string theory is wrong. String theory seems to require supersymmetry at extremely high energies, like the Planck scale, which is roughly $10^{16}$ TeV. But it doesn't require supersymmetry at $1$ TeV. (This is not to say that string theorists haven't predicted supersymmetry at LHC. Some theorists make more predictions than their theories do.)

So string theory remains what it has always been: a fascinating enigma, apparently able to explain all of physics, but refusing to actually do so.

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Ha ha, Some theorists make more predictions than their theories do. made me LOL, nice answer +1 –  Dilaton Nov 28 '12 at 17:08
LOLs seconded!! –  alexarvanitakis Feb 23 '13 at 21:23