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The Standard Model of particle physics is a theory concerning the electromagnetic, weak, and strong nuclear interactions, which mediate the dynamics of the known subatomic particles. Developed throughout the mid to late 20th century, the current formulation was finalized in the mid 1970s upon experimental confirmation of the existence of quarks. Since then, discoveries of the bottom quark (1977), the top quark (1995) and the tau neutrino (2000) have given credence to the Standard Model. Because of its success in explaining a wide variety of experimental results, the Standard Model is sometimes regarded as a theory of almost everything.
In some models of extra dimensions, the gravitational
eld can propagate into (n + 4)-dimensions, where n is the number of extra dimensions,
while the Standard Model particles are restricted to four-dimensional
space-time. Therefore, the gravitational field as measured in four dimensions is
reduced in strength from the fundamental gravitational field. As a result, the
Planck scale in (n+4)-dimensions MD would be much smaller than the Planck
scale in four dimensions MPl, and possibly comparable to the electroweak scale.
Examples of such models of extra dimensions are the ADD model, which is a
model of large
at extra dimensions [1, 2, 3], and the Randall-Sundrum model 
with small warped extra dimensions.
If extra dimensions exist and MD is in the TeV range, microscopic black
holes with masses at the TeV scale could be produced at the Large Hadron
Collider [5, 6, 7, 8]. Black holes are expected to be produced when half the
classical impact parameter of two colliding partons is smaller than the higherdimensional
horizon radius corresponding to a black hole with mass equal to
the invariant mass of the colliding parton system.
In summary, a search for extra dimensions in the same-sign dimuon nal state has been performed using 1.3 fb1 of data recorded with the ATLAS detector in 7 TeV proton-proton collisions at the LHC. No excess of events over the Standard Model prediction is observed and exclusion contours are obtained in the plane of the reduced Planck scale MD and the threshold MTH for black hole production.
Originally posted by Vaxar
So in layman terms there are no hidden dimensions like an alternate universe and whatnot?? Just would like to know a little more by what is ment with 4 dimensions and what are the dimensions, are we talking about the likes of a 3d world compared to a 2d world?
Originally posted by whatsinaname
BUNK! don't tell me the standard model is fixed and then link to wikipedia =/
scientists are even using the extra dimentions as an hypothesis for the recent neutrino problem so don't rule it out yet.
Yes the search for the Higgs isn't going that well and if they find it below 130 GeV that may pose some problems for the standard model. It doesn't mean we need to throw it out, but it might need some revision.
Originally posted by Hellhound604
we just have to remember that this isn't the last word on the Standard Model. That depends on the Higgs boson being found (Which the LCH hasn't found yet), and there are a couple of other problems with it.....
Originally posted by Tindalos2013
The standard model will change because there are more than four dimensions and that fact is a fact. And it's not just wishful thinking either, i know my realities and they are not governed by what the scientists say or dont say because they maybe clever but they are not wise. Just wait and see, alot of people are going to look very foolish.