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Living At The Polar Circle

Since 2022, when I got invited for a keynote talk at a Deep Learning school, I have been visiting...

Conferences Good And Bad, In A Profit-Driven Society

Nowadays researchers and scholars of all ages and specialization find themselves struggling with...

USERN: 10 Years Of Non-Profit Action Supporting Science Education And Research

The 10th congress of the USERN organization was held on November 8-10 in Campinas, Brazil. Some...

Baby Steps In The Reinforcement Learning World

I am moving some baby steps in the direction of Reinforcement Learning (RL) these days. In machine...

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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 and the SWGO experiments. He is the president of the Read More »

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Sabine Hossenfelder is a well-known theoretical physicist as well as a successful blogger. In her blog today I read a letter she sent to Time Magazine. The letter was triggered by the following sentence in a piece by Jeffrey Kluger discussing the runners-up for "person of the year":

“Physics is a male-dominated field, and the assumption is that a woman has to overcome hurdles and face down biases that men don’t. But that just isn’t so. Women in physics are familiar with this misconception and acknowledge it mostly with jokes.”
I am changing my nickname on a few sites I visit - ones where a nickname is useful - to "allhadronic". The name makes reference to the hadronic final state of certain particle decays. Hadron comes from ancient greek and means "strong", and indeed the strong force is the one responsible for the binding of quarks and gluons inside protons, neutrons, and other unstable particles, collectively also called hadrons.
It has been a while since the last time I posted the last riddle of this series. It was fun though, so upon seeing the graph below I immediately decided I would use it here, to let you guess what it is about. Please use the comments thread to provide your input: what does the graph represent ? What are the different coloured lines ? Why the funny behaviour ? What is on the x axis ? And on the y axis ?



Of course it is virtually impossible to answer all the above without being given some hint. I can tell you it has to do with LHC searches, and that is all the help I am going to give you!
Ben Kilminster is a friend and a distinguished colleague working for the CMS and CDF experiments. Besides being a long-time higgs hunter, having sought that particle for over a decade in the two mentioned experiments, Ben is a veteran of science outreach since for many years he has published summaries of CDF results for the public on the online magazine "Fermilab Today". When I saw him posting on a social network an earlier version of the text below, which I liked a lot, I asked him to make it a guest post entry for my blog, and he graciously agreed.
The new PDG - a full-size copy of the glorious "Review of Particle Properties"- is on my desk since its arrival a few weeks ago, but only today did I get some time to browse it.

It is always awesome to observe how much information is contained in it. It is 1526 pages long, and I wonder how many typos and mistakes are contained in the data-thick pages... Probably much fewer than an ordinary book. Some of the review articles are of exceptionally good quality, because they have been passed from hand to hand in the last few dozen years, and constantly improved. If you want an example, for instance, go to the "Statistics" section - you will find a lot of new material which, along with the old one, still meets the highest standards.
I may have been unattentive to recent papers on Supersymmetry, but I got the impression that during the last few months the majority of SUSY phenomenologists have been keen on speculating on the few apparently non-standard features of the recently discovered Higgs boson, as published last June (such as the alleged copious decay of photon pairs, or the dearth of decays to tau lepton pairs or b-quark pairs - note: all are mostly back to what the standard model predicts, after the analysis of more data following the discovery announcements), but rather improductive on the front of taking the new signal as a pivot point for new global fits.