Fake Banner
Diboson Resonances Review Available Online

This is just a short note - a record-keeping, if you like - to report that my long review on "Collider...

Searching For Light Dark Matter: A Gedankenexperiment

Dark Matter (DM), the mysterious substance that vastly dominates the total mass of our universe...

Roberto Carlin To Lead CMS Experiment In 2019-20

Great news for the CMS experiment - and for Italy, and for my institution, Padova, where I coordinate...

Your Main Reference For Resonances Decaying To Boson Pairs

Some shameless self-promotion is in order today, as my review titled "Hadron Collider Searches...

User picture.
picture for Hank Campbellpicture for Sascha Vongehrpicture for Bente Lilja Byepicture for Patrick Lockerbypicture for Johannes Koelmanpicture for Heidi Henderson
Tommaso DorigoRSS Feed of this column.

Tommaso Dorigo is an experimental particle physicist, who works for the INFN at the University of Padova, and collaborates with the CMS experiment at the CERN LHC. He coordinates the European network... Read More »

Blogroll
Triggered by a preprint appeared three days ago on the ArXiV -a fundamental resource for particle physicists willing to stay in touch with the latest developments of the theory and new experimental results-  this morning I was gearing up to write a post with a careful, didactical discussion of why we believe that the subnuclear world includes three generations of quarks and three generations of leptons, what is the evidence for this peculiar fact, and what would a fourth generation of matter imply for e.g. searches of the Higgs boson. Unfortunately, my memory is still good enough to let me remember that I did write about those things in my old blog, about one year ago.
A new report on the freedom of press has been released today by freedomhouse.org. Freedom House is an independent, non-profit organization created in 1941 to monitor and defend the freedom of press in the World. The study is being presented today at the Washington News Museum, and the event can be followed via a live webcast through the organization's web site.

According to the report, freedom of press is declining everywhere, and it has been doing so for seven years in a row. The phenomenon is not just due to a few non-liberal countries:
The rollback was not confined to traditionally authoritarian states; with Israel, Italy and Hong Kong slipping from the study's Free
2008 was a horrible year for the Large Hadron Collider. Just nine days after an extremely successful, highly publicized start-up on September 10th, when hundreds of reporters gathered at CERN to follow the protons as they ventured sector by sector to manage a full turn of the 27 km ring, a stupidly crafted electrical connection failed in sector 3-4 of the machine. This brought above criticality a superconducting solenoid, vaporized six tons of liquid helium, and damaged 53 expensive magnets in the sector with a powerful blast.
These are hard times for evil guys like me, who are always willing to speculate wildly on particle physics results -only to secretly chuckle at the ripples their extrapolations make, knowing for a fact that the Standard Model is as solid as it has ever been.

Suggestive new results which offer themselves as the first hint of a breakdown of the Standard Model are indeed quite rare nowadays. In a famous post which originated a $1000 bet (taken up in part by Prof. Gordon Watts and in part by Prof. Jacques Distler), no less than 32 months ago I was writing in my old blog:
A comment in the thread under my recent post on the greedy bump bias stimulates me to provide here idiot-proof instructions on how to study the effect by yourself, if you wish to spend your time this way. In fact, if I provide you with a simple piece of code plus some fairly immediate instructions on how to set up ROOT in your own PC, I bet you can be up and checking biases in five minutes. Want to try ? Let's see.


  1. Go to the ROOT home page.
Here is the concluding part (for the first part see here) of a discussion of a few subtleties involved in the extraction of small new particle signals hiding within large backgrounds. This is a quite common problem arising in data analysis at particle physics experiments, but it is not restricted to that field. Quite on the contrary: narrow Gaussian signals are commonplace in many experimental sciences, and their identification and measurement is thus an issue of common interest.