Fine tuning and new physics at the LHC November 25, 2006Posted by dorigo in news, physics, science.
Today’s Atlas-CMS workshop featured a talk by Andrea Romanino, who gave a nice review of the physics scenarios of the LHC, and spent some time discussing the problem of fine tuning: the radiative corrections to the Higgs mass being dependent on the mass scale at which new physics is present, through some parameters that have to be “fine-tuned”, that is found to have just the right value to make the math work.
The bottomline is that if you are disturbed by fine-tuning of the theory at the level of percent or so, the new physics scale – the value of masses at which new physics could be observed – becomes too high, and thus out of reach of the LHC. Beware, this is somehow a simplification of a very complex issue, and there are independent arguments that would change the picture.
I am not sure I understood more than 50% of the talk – so please be advised that rather than asking me the details, you could directly go and look at the slides by yourself: they can be found at http://www.bo.infn.it/Atlas-Cms2006/ .
However, the flavor I tasted of the whole thing is that the more we get close to put our hands on proton collisions at 14 TeV, the more we worry about it not being enough for letting us see beyond… The experimentalists at the talk today look to me as kids who used all their LEGO to build a step to climb on in order to reach and see what’s inside a forbidden drawer: the step looked impressive as they were assembling it, but as they drag it next to the cupboard, they wonder whether they’ll get high enough by stepping on it…