Physics

The ICHEP conference in Chicago is drawing to a close, and although I did not have the pleasure to attend it (I was busy with real work, you know ;-) I think I can post here some commentary of a few things I find interesting among the multitude of analyses and searches that were shown there. It goes without saying that the selection is biased by my personal interest, plus by my limited patience with peeking at talk slides. In fact, here I only cover one specific Higgs boson decay mode!

But a digression first - and a digression on the digression
So, by now we all know it - there is no 750 GeV resonance in LHC data. But will we ever learn the lesson ?
The facts

Let me start this post by recalling the bare facts, and a quick-and-dirty introduction for anybody who has been on the Moon in the last eight months or so. Last December, the CMS and ATLAS experiments at the CERN LHC collider presented in two back-to-back seminars their first results on data collected at unprecedented proton-proton collision energy of 13 TeV. The 60% higher center-of-mass energy with respect to collisions analized in the previous years left hopes alive for the discovery of some new physics process, which could have been hiding until then thanks to the large required energy to turn on the reactions. 
As explained in the first installment of this series, these questions are a warm-up for my younger colleagues, who will in two months have to pass a tough exam to become INFN researchers.

A disclaimer follows:
<!--[if gte mso 9]> 800x600 <![endif]-->

                Geometric Contrast of Quark and Neutrino Mixing Hierarchies             &nbsp

As explained in the first installment of this series, these questions are a warm-up for my younger colleagues, who will in two months have to pass a tough exam to become INFN researchers.
A disclaimer follows:
As explained in the previous installment of this series, these questions are a warm-up for my younger colleagues, who will in two months have to pass a tough exam to become INFN researchers.
A disclaimer follows:
As explained in the previous installment of this series, these questions are a warm-up for my younger colleagues, who will in two months have to pass a tough exam to become INFN researchers.

A disclaimer is useful here. Here it is:
As explained in the previous installment of this series, these questions are a warm-up for my younger colleagues, who will in two months have to pass a tough exam to become INFN researchers.
By the way, when I wrote the first question yesterday I thought I would not need to explain it in detail, but it just occurred to me that a disclaimer would be useful. Here it is:
Today I wish to start a series of posts that are supposed to help my younger colleagues who will, in two months from now, compete for a position as INFN research scientists. 
The INFN has opened 73 new positions and the selection includes two written exams besides an evaluation of titles and an oral colloquium. The rules also say that the candidates will have to pass the written exams with a score of at least 140/200 on each, in order to access the oral colloquium. Of course, no information is given on how the tests will be graded, so 140 over 200 does not really mean much at this point.

The Large Underground Xenon (LUX) dark matter experiment, which operates beneath a mile of rock at the Sanford Underground Research Facility in the Black Hills of South Dakota, has completed its search for the missing matter of the universe yielding no trace of a dark matter particle. 

LUX's extreme sensitivity makes the team confident that if dark matter particles had interacted with the LUX's xenon target, the detector would almost certainly have seen them. In a 'what you don't find is important also' sense, these new limits on dark matter detection will allow scientists to eliminate many potential models for dark matter particles.