Eoz zei:
Is het Higgs-deeltje gevonden? - EOS Magazine
Volgens geruchten is bij een experiment in de grote deeltjesversneller het lang gezochte Higgs-deeltje gespot. De waarneming is echter nog niet officieel bevestigd door wetenschappers van het CERN.
Maar...
A commenter on the previous posting has helpfully given us the abstract of an internal ATLAS note claiming observation of a resonance at 115 GeV. It’s the sort of thing you would expect to see if there were a Higgs at that mass, but the number of events seen is about 30 times more than the standard model would predict. Best guess seems to be that this is either a hoax, or something that will disappear on further analysis.
Nog wat meer info hierover:
This is what one of the CERN guys said on SomethingAwful:
This "potential discovery of the Higgs" is anything but I'm afraid. I've had a read of the paper, and there are a few things that are important to note here.
1: It's an ATLAS COM note, which is meant to be internal to the ATLAS experiment and has absolutely no peer review. Anyone in ATLAS can write a note like this, and it could be total bullshit. The next stage in the process is to write an internal note, which is put under somewhat more scrutiny by the collaboration prior to turning it into a publication if it's considered good enough to do so
2: The person heading up this note, Ms. Wu, is famous both inside and outside ATLAS for spamming vast amounts of notes out in the hope that one of them will be of some merit. She's hell-bent on finding the Higgs in the way that Rubbia was in finding the W boson back in the day. Sometimes people sacrifice good physics for the desire to get the prize. She "found" the Higgs at the LEP experiment at 115GeV in the gamma gamma channel as well, but this discovery was ruled out then too.
3: The analysis is flaky to say the least- they don't model the background at all, and merely fit to the distribution shape. In QCD backgrounds are very important. That bump could come from anywhere, either a detector, trigger or physical effect arising from a background distribution they don't understand
4: If the bump genuinely is a particle, it is NOT a standard model Higgs. They find about 30 events in the peak, which with the data we have now is much too many to be a Higgs- it would mean the number of Higgs produced is about a factor of 10 or more larger than the Standard Model allows for. We'd have seen it in the US Tevatron experiments, and maybe even at LEP if it was produced as copiously as this. What it could be is something new and non-standard model. If it is that's amazing, but again it's hard to imagine something that only appears at LHC energies and not at those of the tevatron in such copious amounts
5: This has caused a massive shitstorm in ATLAS because internally everyone knows it's shit, but it leaked within about 10 minutes of being circulated internally and the press/bloggers have jumped on it like it's evidence that god exists, elvis has returned from his trip to mars, and flying pigs use antigravity to get around.
The party line from the experiment is "This is not an official ATLAS publication". The general feeling is that the backgrounds need to be understood, the analysis needs monte-carlo simulation to back it up, and that the group who produced these results should have put a lot more effort into the publication before spamming it and claiming "first post".
I should put a huge disclaimer here: I'm not a member of the ALTAS collaboration, though I do work at CERN. My speciality is not Higgs physics, so my understanding of this only comes from a general particle physics background. Any opinion I express here is my own and not for republication.
