I wonder how interesting can be to an outsider to learn that the mass of the sixth quark is now known to 0.38% accuracy, thanks to the combination of measurements of that quantity performed by the CMS experiment at CERN. In fact, the previously best measurement was the one recently published by the DZERO collaboration at Fermilab
, which has a relative 0.43% accuracy. "So what" - you might say - "this 14% improvement does not change my life". That's undeniably true.
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Last Friday Samuel Ting, the winner of the 1975 Nobel prize in Physics for the co-discovery of the J/ψ particle, gave a seminar in the packed CERN main auditorium on the latest results from AMS, the Alpha Magnetic Spectrometer installed on the international space station.
Being at CERN for a couple of weeks, I could not refrain from following yesterday's talks in the Main Auditorium, which celebrated the 90th birthday of Herwig Schopper, who directed CERN in the crucial years of the LEP construction.
A talk I found most enjoyable was John Ellis'. He gave an overview of the historical context preceding the decision to build LEP, and then a summary of the incredible bounty of knowledge that the machine produced in the 1990s.
After four months of frenzy by over 1500 teams, the very successful Higgs Challenge
launched by the ATLAS collaboration ended yesterday, and the "private leaderboard" with the final standings has been revealed. You can see the top 20 scorers below.
I just read with interest the new paper on the arxiv by my INFN-Padova colleague Massimo Passera and collaborators
, titled "Limiting Two-Higgs Doublet Models
", and I thought I would explain to you here why I consider it very interesting and what are its conclusions.