Higgs Decay To Muons: CMS Wins The Race

As of late we have been scratching the barrel of "straightforward" measurements of the properties...

Systematic Uncertainties: The Heart Of The Matter In Physics Measurement

Experimental physics is about investigating the world in a quantitative manner, by exploiting our...

An Online, Interactive Conversation With David Orban July 6th, 7PM CET

On July 6th, at 7PM CET (1PM in NY, 10AM in California) I will be chatting online with David Orban...

A Nice Swindle

It is not a secret that I love chess, and that whenever I have the chance to play some online blitz...

 Tommaso Dorigo 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

Nuisance Parameters In Classification Problems: A Simple Example

Apr 12 2020 | comment(s)

These days I have been writing a chapter of a book on machine learning for physics, and in so doing I have found myself pondering on how to best explain, in very simple terms, the nocuous effect that model uncertainty may have on the result of a classification task. So I decided to create a toy example with the purpose of introducing the discussion.

The example is meant to have two attractive properties: be analytically solvable in closed form - meaning that one may compute with paper and pencil all the relevant results - and be described by simple-to-interpret graphs. Below I will describe what I came up with, but first let me explain what are the points I wish to focus on.

Gemstone Classification With A Specific Gravity Scale

Apr 06 2020 | comment(s)

The isolation that most of the civilized world has been subjected to, during the past few weeks, has produced a number of nasty effects, first and foremost on our economies, but it has also had a few positive ones. One of them is, at least in my case, an urge to use the extra time I have in my hands in a creative way.

The Plot Thickens: Yet Another Lattice QCD Calculation Restores The Anomaly Of The Muon Magnetic Moment

Mar 27 2020 | comment(s)

In a recent post I discussed the conclusions of a study aimed at computing a small but very important correction to the theoretical prediction of the anomalous magnetic moment of the muon. The interest of this lays in the fact that the latter quantity is virtually the only one for which the Standard Model prediction exhibits a tension with the current experimental measurements among all the measurable parameters of the subnuclear world.

The Virus That Turns Physicists Into Crackpots

Mar 19 2020 | comment(s)

First off, let me say I do not wish to sound disrespectful to anybody here, leave alone my colleagues, to most of which goes my full esteem and respect (yes, not all of them, doh). Yet, I feel compelled to write today about a sociological datum I have paid attention to, in these difficult times of isolation, when all of us turn to the internet as our main outlet for rants, logorrhea, or to make the impending threat of a global catastrophe less heavy by sharing it with our peers, to exorcise our fears.