A Marie Sklodowska-Curie ITN funded by the Horizon2020 program of the European Commission



W Mass: Closing In

by Tommaso Dorigo

After a lot of agonizing work on tiny systematic uncertainties, the ATLAS collaboration released in time for the Moriond conference their latest measurement of the W boson mass (in fact the only one so far). The result is in close match with previous determinations, and has a slightly larger error bar than those. So why bother discussing it here ?

There is a reason. The W boson is one of the most important subatomic particles Continue reading “W Mass: Closing In”

AMVA4NewPhysics Deliverable 4.1: Report of the Performance of Algorithms for Data-Driven Background Shape Modeling

by AMVA4NewPhysics press office

And here it is, the second – but really synchronous in publication with the first – scientific deliverable of our network. Deliverable 4.1, titled “Report of the Performance of Algorithms for Data-Driven Background Shape Modeling“, is a report of studies performed by network members operating within Work Package 4, also known as “New Statistical Learning Tools for HEP Analysis“.

The research presented in this document aims at constructing a precise representation of background processes to searches for small signals in hadron collider data. Specifically, we focused on the multijet QCD background, Continue reading “AMVA4NewPhysics Deliverable 4.1: Report of the Performance of Algorithms for Data-Driven Background Shape Modeling”

AMVA4NewPhysics Deliverable 1.1: MVA for Higgs Boson Searches at the LHC

by the AMVA4NP press office

It is with a certain satisfaction that I can announce today that the AMVA4NewPhysics network is in complete control of its planned schedule, and has now started to provide real research-grade output, delivering its first two scientific products of relevance. Deliverable 1.1 (from work package 1, which focuses on MVA applications to Higgs boson studies) and Deliverable 4.1 (from work package 4, which focuses on the development of entirely new Machine Learning tools with in mind their application to specific HEP Continue reading “AMVA4NewPhysics Deliverable 1.1: MVA for Higgs Boson Searches at the LHC”

Anomaly! Now Available As E-Book

by Tommaso Dorigo

Today I would like to mention that my book “Anomaly! Collider Physics and the Quest for New Phenomena at Fermilab” is now available for purchase as E-Book at its World Scientific site.
For the occasional readers and the absent-minded regulars, below I paste a summary of what the book is about, the endorsements it received from distinguished scientists in the field, and a few links to reviews in internet resources. The web site of the book at World Scientific is here. At the WS site you Continue reading “Anomaly! Now Available As E-Book”

Tagging and probing

by Alexander Held

The winter conferences are approaching, where both ATLAS and CMS are aiming to show their latest scientific results with the data gathered in the last year. 2016 saw a huge increase in the size of this dataset, which results in a drastic increase in sensitivity to some of the phenomena we are searching for. A large amount of work goes into understanding this data and ensuring that the models we are Continue reading “Tagging and probing”

New Decay Of Lambda_b Seen By LHCb!

by Tommaso Dorigo

The so-called Lambda_b baryon is a well-studied particle nowadays, with several experiments having measured its main production properties and decay modes in the course of the past two decades. It is a particle made of quarks: three of them, like the proton and the neutron. Being electrically neutral, it is easily likened to the neutron, which has a quark composition “udd”. In the space of quark configurations, the Lambda_b is in fact obtained by exchanging a down-type Continue reading “New Decay Of Lambda_b Seen By LHCb!”

A Slow-Motion Particle Collision

by Tommaso Dorigo

Lubos Motl published the other day in his crazily active blog a very nice new review of “Anomaly! Collider Physics and the Quest for New Phenomena at Fermilab“. The review is authored by Tristan du Pree, a colleague of mine who has worked in CMS until very recently – now he moved to a new job and changed to ATLAS! (BTW  thanks Lubos, and thanks Tristan!)

I liked a lot Tristan’s commentary of my work, and since he mentions with quite appreciative terms the slow-motion description of a peculiar collision I offer in my book, I figured I’d paste that below. But before I do that, let Continue reading “A Slow-Motion Particle Collision”

TTH or TT & H ?

by Tommaso Dorigo

Today while I was having a shower I happened to think at how cool it is that we can actually measure the rate of production, in single hadron-hadron collisions, of multiple elementary particles. A graph like the one below, now routinely produced by ATLAS and CMS whenever they collect more data or switch to a higher center-of-mass energy, looks “natural” to produce, but it is actually surprising that we indeed can pull it off – it requred careful design choices in a number of ways. I wish to discuss one of these here.

Continue reading “TTH or TT & H ?”

CERN from the inside

by Grzegorz Kotkowski

Since the beginning of October I have been in secondment at CERN. I expressed my first feelings about this complex research center in my post “CERN at first sight”. Two months have passed and my former admiration has settled down. The common days allowed me to get accustom to it and eventually I could focus on my work.

Throughout this time I have participated in numerous seminars and speeches. As I am not a physicist some of them were difficult for me to follow, but eventually Continue reading “CERN from the inside”

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