http://motls.blogspot.com/2010/07/combined-d0cdf-higgs-results-next.html

He forgets completely all other hierarchies.

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Related to hierarchy is the the problem of “naturalness” in the Standard Model. A small parameter in a theory is “natural” when setting it to zero increases some symmetry of the theory, therefore its smallness can be attributed to that very symmetry.

For instance, the masslessness of a vector field such as the photon can be related to the gauge invariance of the theory. However, for a scalar field, such as the Standard Model Higgs, no symmetry is there to protect its mass from acquiring quadratically divergent corrections at the loop level (Fig. 1-3), unless the theory is highly fine-tuned (Fig. 1-2). The required precision of fine-tuning depends on how far one wishes to extend the validity of the Standard Model. If one wishes it account for

loop corrections up to the Planck scale, while keeping the Higgs lighter than 1 TeV, as required by electroweak measurements, then the required fine-tuning is so precise that it seems unnatural (hence the connection between naturalness and hierarchy).

A solution to this can be either to abandon the concept of fundamental scalars, as in technicolor models (Sec. 1.2.4), or to search for a theory where quadratic divergences cancel, as in Supersymmetry (Sec. 1.2.2).

He forget the other types of numbers, as primes.

The technicolor version:

…is new strong dynamics. With the introduction of a new non-abelian gauge symmetry and additional fermions (“technifermions”) which have this new interaction, it becomes possible to form a technifermion condensate that can break the chiral symmetry of fermions, in a way analogous to QCD where the q¯q condensate breaks the approximate SU(2) × SU(2) symmetry down to SU(2)isospin. The breaking of global chiral symmetries implies the existence of Goldstone bosons, the “technipions” (πT ), in analogy with QCD pions. Three of the Goldstone bosons are absorbed through the Higgs mechanism to become the longitudinal components of the W and Z, which then acquire mass proportional to the technipion decay constant.

If quarks and leptons are not elementary, then they are predicted to have excited states

What is absorbing the energy and how? This is something to think at?

]]>The simplest supermodels involve s-channel resonances in the quark-antiquark and especially in the quark-quark channels.

classify the decay modes of new resonances in terms of three basic decay topologies, which often appear in perturbative new physics (topological) scenarios, X

A. directly to two detectable final state particles.

B. decays to one detectable final state and one new secondary resonance

Y .

C. decays to two new secondary resonances Y1 and Y2, diff. mass?

A model, but so close? A scaling hierarchy? A quasiparticle with EMD-charachter? Why has it been hiding?

]]>Zoltan Ligeti, a physicist at the Lawrence Berkeley National Laboratory in California, and his colleagues have calculated that as it ramps up, the LHC will generate enough collisions to produce clear signatures of a hypothetical “diquark” particle proposed by some forms of string theory.

– Which forms, I wonder? Goldstone (meson) boson?

a 3.2sigma deviation from the standard model prediction in the like-sign dimuon asymmetry. http://arxiv.org/abs/1006.0432

http://www-theory.lbl.gov/~ligeti/

http://www.slac.stanford.edu/cgi-bin/spiface/find/hep/www?rawcmd=find+a+z.+ligeti&FORMAT=WWW&SEQUENCE=