Recent content by Sleuth

Hi everyone, I am trying to get familiar with some of the terminology and concepts recurring more or less everywhere in LHC phenomenology. In particular, something that is troubling me a bit is the concept of sudakov form factors, which I don’t find explained anywhere in an understandable way...

I completely agree with you!

Vanadium, ok, I think the discussion is going completely in the wrong direction. I was not referring to people on the forum, whether you believe it or not, instead to an attitude of a part of the community during talks, conferences etc, but I don't feel like repeating this again. I don't see...

I don't know about Sabine, cannot talk for here, but on my side, I think I did my best to understand the arguments that people talk about. My point was entirely another. There is no doubt that, if there was really a magic cancellation of 15 orders of magnitude, everyone should be bothered. And...

Thanks for the answers. So just to see if I understand your answers, the difference has to do mainly with the largeness of the coupling...? Self coupling exists also in gravity, but we still talk about gravitational waves, at least in the linear regime (where the coupling is small and self...

Just to clarify, I did not mean that any answers in this thread were arrogant. I meant the way the hierarchy problem was presented before people crushed againsted LHC disappointing results (from this point of view). What I can see, for example, is that the way people talk about this problem...

I would like to make a comment. The hierarchy problem has been bugging the community for a long time, and for a long time very clever people have been going around making claims like the ones we read here, i.e. There is a natural scale (the Planck mass) for the higgs mass, there is therefore a...

Hi everyone, I have a question that, when came to me, sounded a bit silly to me as well, but then I realized, I myself maybe don't understand the logic behind this 100%, so why not discussing with you about it. So my question is the following. Usually we are used to do quantum field theory...

I see one more problem that should be considered in the discussion. Based on the most fundamental principles on physics (action-reaction), the only way we can conceive to accelerate from one place to another in empty space is to "throw" something in the opposite direction. Unfortunately in space...

The question is a bit vague to me, but for example a place where a discussion on the QCD vacuum can be found is: http://arxiv.org/pdf/hep-ph/0607268.pdf Peccei was one of the "inventors" of the Axion in order to provide a solution of the so called strong CP problem, which arises precisely due...

Dear Andrea M., I also find your question very interesting and I hope some people that know what they are talking about will reply. On my side, I can tell you how I see it. Namely yes, I think the scale \Lambda that characterizes strong interactions is not an intrinsic property of the SU(3)...

Hi! Before trying to answer (I am also not an expert but I am trying to learn this stuff my self), I am confused by your question. You say that any complex coupling generates CP violation. What do you mean? A complex coupling constant, say 'g'? Or a vertex which contains a complex field? The...

Thanks Hepth! The paper looks like it goes in the right direction. Going through it fast I haven't found a precise quantitative statement on the running of the ew couplings, but maybe I should take some time to read it more carefully! Thanks

Thanks a lot mfb! That's precisely what I was looking for!

Thanks Vanadium. Could you point me to the CMS/ATLAS papers with the last updates on the significance? I had and have no doubt about the smallness of the probability of a statistical fluctuation, and that was not the reason why I asked. I still think it would be interesting to know how the...