A Quantum Diaries Survivor

That's right - I finally hit the ground with my creativity, and my jokes are starting to use old material for my post titles. Yet producing a pair of Higgs bosons in a proton-proton collision is seriously cool indeed. The Higgs boson in fact is one of the few particles that does a trick called "self-coupling": in a sort of ermaphroditic act it is capable of giving birth to a pair of objects identical to itself. 

Have you ever looked at the moon through a telescope, or even a pair of binoculars? Our satellite is really beautiful to look at - it is full of detail you can get lost in: craters, mountain ridges, canyons, plateaus. And there's no clouds to obscure the view (if you are a planetary observer and you put an eye on Mars a couple of years ago you know what I mean - a dust storm that went on for weeks completely hid the surface from outside observers).

I was blissfully unaware until today of a slightly anomalous effect, which was found by the ATLAS Collaboration when performing a search for top pairs plus Higgs bosons in their Run 2 data. The anomaly I am talking about is an apparent excess of events which could be explained, as ATLAS did in this preprint article, by dialing up the cross section of some background processes producing a top pair and a W boson. 

Tomorrow - that is, November 8th, at 8AM GMT - I am chairing a session titled "Artificial Intelligence for Physics Research, and Physics Research for Artificial Intelligence" at the Vth USERN Congress. The event takes place in Tehran, and is broadcast via zoom. If you are interested in the talks, of which I give some detail below, you will be able to connect through this link.The agenda of the workshop is as follows (those shown are are Tehran times):11.30-11.55 Tommaso Dorigo, “Artificial intelligence and fundamental physics research”

The sanitary emergency presently affecting most countries across the World is highlighting the duties that each of us, as a member of a collectivity of individuals who share commodities, services and infrastructure, is called at times to attend to. In a well-functioning society paying taxes should not be enough to earn the right to be a citizen. Indeed, the "social contract" also demands us to, e.g., abide to laws. 

Every time I lecture my students about the static quark model I find that the construction of hadrons from their constituents is really entertaining. Probably I have more fun than my students as I explain the details, but today you get to be the judge - I am going to explain it here, and test your patience and skills as a matter builder.Hadrons are composite particles made of quarks. The word "hadron" comes from ancient Greek αδρος, which means "thick, bulky". The two hadrons we know best are protons and neutrons, which make up atomic nuclei; but there exist literally hundreds more, which are unstable and decay very quickly after they are created, in subnuclear reactions we can produce using particle accelerators. 

For some reason today I remembered that 11 years ago (wow time flies) I wrote a two-parts piece on advices for PhD students doing a thesis in experimental particle physics. As I checked it out, I found that I mostly share the views I had back then (TBH that's not necessarily a good thing - consistency requires you to be as ignorant as you were earlier on). Since I think that stuff I posted over 10 years ago are otherwise lost in oblivion and not picked up by generic google searches, I decided it is time to recycle that text - here it is below, unamended but collated into a single longish article. Enjoy!

Marco Fulvio Barozzi (b.

Particle Physics deals with the study of the elementary constituents of matter, and the interactions that they withstand. When non-insiders hear of elementary particles and the experiments that study them, probably their mind goes to experiments at the Large Hadron Collider, CERN's giant accelerator of protons and heavy ions that produced the collisions used by the ATLAS and CMS experiments in 2012 to discover the Higgs boson. The association with LHC and the Higgs particle is very likely because that discovery took the media by storm when it was announced, and rightly so.

W bosons, what are they? To answer this question, let me first tell you that our world is made of matter held together by forces. If you look deep within, you will realize that matter is essentially constituted by "fermions": quarks and leptons, particles that possess a half-integer unit of spin, in a certain meaningful system of measurement units. Forces, on the other hand, are the result of fermions exchanging different particles called "bosons", particles that possess integer units of spin.

"Anti-scientific thinking" is a bad disease of our time, and one which may affect a wide range of human beings, from illiterate fanatics such as anti-vaxxers and religious fundamentalists on one side, to highly-educated and brilliant individuals on the other side. It is a sad realization to see how diversified and strong has become this general attitude of denying the usefulness of scientific progress and research, especially in a world where science is behind every good thing you use in your daily life, from the internet to your cell-phone, or from anti-cavity toothpaste to hadron therapy against tumours.

As every other aspect of human life, science communication has suffered a significant setback due to the ongoing Covid-19-induced pandemic. While regular meetings of scientific teams can be effectively held online, through zoom or skype, it is the big conferences that are suffering the biggest blow. And this is not good, for several reasons.