Hello there! My name is Seng Pei Liew, and I am the “Marie Sklodowska-Curie Actions” Innovative Training Network (AMVA4NewPhysics) early-stage researcher based at the Technische Universitat Munich (TUM). I am tasked in the network to look for new physics at the Large Hadron Collider (LHC) using advanced statistical tools. In my very first article here, I would like to talk Continue reading “Dark Matter Hunting at the LHC”
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”
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!”
As I am traveling around Europe this week, giving seminars in several places (Hamburg yesterday, Berlin today, and Clermont-Ferrand on Friday) my connectivity is erratic and my capability to follow the development of data analysis and new publications is strongly lowered. My connections to the world of LHC research continues through email exchanges, though.
One thread I found in my mailbox this morning developed from a question on the use and meaning of the so-called “Brazil Bands”, a feature of Continue reading “Brazil Bands: What Are They ?”
The DZERO collaboration published earlier this year a search for resonances decaying to pairs in its Run-2 dataset of 2-TeV proton-antiproton collisions, produced by the now defunct Tevatron collider in the first 10 years of this century. Starting from a sample of about 5600 B_s events, they surprisingly claimed Continue reading “Story of a Failed Resonance”
This time I’m going to write about the ways of approaching general searches for new phenomena. I invite you to read my previous post to get some context, if you haven’t already. The essence of such searches is to explore as many signatures as possible, without assuming any model of new physics. But how does one do that?
During my last visit to CERN, I had the chance to meet in person for the first time Continue reading “Approaching General Searches, part I”
Ciao. As the title suggests, it’s been about half a year now since I started my PhD research, and last week I presented a summary of my work so far to the CMS group here in Padova. I thought it would be an interesting exercise to translate my presentation into a more blog-friendly form, but for the more scientifically minded, I’ll link the original at the end. Here goes! Continue reading “Six months in”
The first few copies of my new book, “Anomaly! – Collider Physics and the Quest for New Phenomena at Fermilab” arrived this morning from Singapore. With pleasure, I was finally able to hold in my hand the result of a long work… It started in 2008, when the unfolding story of an intriguing multi-muon signal in CDF data had me first caress the idea of writing about two decades of investigations carried out by Continue reading “Anomaly!”
Guten Tag! Last week I took a short break from my secondment in Padova (which is going well, expect a post on it sometime) to attend a CMS data-analysis school hosted by The Deutsches Elektronen-Synchrotron (DESY) in Hamburg.
I’d gone with the hope of getting a proper and hands-on introduction to CMSSW, the centrally-managed software used by the CMS collaboration to access and analyse their data from the LHC. I got this, and a lot more!
The school began Continue reading “Data analysis in Hamburg”