Today in arXiv


After the excitation for the findings at Tevatron, we turn back to routine. Of course, I have never forgotten to cast a glance at arXiv where it is crystal clear the vitality of the physics community. I want to put down these few lines to point to your attention a couple of papers appeared today on the preprint archive. Today, Nele Vandersickel uploaded her PhD Thesis (see here). She has got her PhD on March this year. Nele was one of the organizers of the beautiful and successful conference in Ghent (Belgium) where I was present last year (see here, here and here). But most important is her research work with the group of Silvio Sorella and David Dudal that is the central theme of her thesis. Nele does an excellent job in presenting a lot of introductory material, difficult to find in the current literature, beside her original research. Sorella and Dudal have accomplished an interesting research endeavor by supporting the Gribov-Zwanziger scenario, at odds in the initial formulation with lattice data, with their view that condensates must be accounted for. In this way, Gribov-Zwanziger scenario can be taken to agree with lattice computations.  These theoretical studies describe a consistent approach and these authors were able to obtain the masses of the first glueball states. I would like to conclude with my compliments for the PhD reached by Nele and for the excellent wotk her and the other people in the group were able to realize.

The other fine paper I have found is a report by a group of authors, “Discoverig Technicolor”, giving a full account of the current situation for this theoretical approach to the way particles acquire their masses. As you know, the original formulation of the Higgs particle that entered into the Standard Model contains some drawbacks that motivated several people to find better solutions. Technicolor is one of these. One assumes the existence of a set of Fermions with a self-interaction. We know that this kind of models, as Nambu-Jona-Lasinio is, are able to break symmetries and generate masses to massless particles. Indeed, one can formulate a consistent theory with respect to all the precision tests of the Standard Model as also discussed in this report. This means in turn that in accelerator facilities one should look for some other Fermions and their bound states that can also mimic a standard Higgs scalar boson. It is important to note that in this way some drawbacks of the original Higgs mechanism are overcome. Of course, the relevance of this report cannot be underestimated in view of the results coming out from LHC and we could know very soon if an idea like Technicolor is the right  one or not. For sure, this is time for answers in the end.

Nele Vandersickel (2011). A study of the Gribov-Zwanziger action: from propagators to glueballs arXiv arXiv: 1104.1315v1

J. R. Andersen, O. Antipin, G. Azuelos, L. Del Debbio, E. Del Nobile, S. Di Chiara, T. Hapola, M. Jarvinen, P. J. Lowdon, Y. Maravin, I. Masina, M. Nardecchia, C. Pica, & F. Sannino (2011). Discovering Technicolor arXiv arXiv: 1104.1255v1

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