Large Hadron Collider (LHC) News

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Re: Large Hadron Collider (LHC) News

#441  Postby newolder » May 19, 2012 9:17 pm

What's in a name? :dunno:
http://en.wikipedia.org/wiki/Bottom_quark wrote:On its discovery, there were efforts to name the bottom quark "beauty", but "bottom" became the predominant usage.

Apparently, there are other 'charges' than electrostatic (which may, itself, turn out to be a composite of other 'charges') and the color (sic) charge of quantum chromodynamics is overall neutral for (stable?) hadrons, iirc...
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Re: Large Hadron Collider (LHC) News

#442  Postby newolder » May 30, 2012 5:45 pm

SETI talk by Michael Peskin on LHC & other particle fizex...
[youtube]http://www.youtube.com/watch?v=W2_9UaTjMcA[/youtube]
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Re: Large Hadron Collider (LHC) News

#443  Postby twistor59 » Jun 18, 2012 7:44 am

Limit curves and stuff:

http://www.science20.com/quantum_diaries_survivor/how_fast_do_we_get_higgs_mass_plots_raw_data-91135

So both ATLAS and CMS are frantically tuning their analyses these days, and in the process of adding the latest data. I mentioned the fact that the analysis of the new data will not take long in a previous post, and I got questions on the process by curious readers in the thread. I answered in some detail on what is the difference between "spinning" the data and "reconstructing" the events there, and then I thought that the answer would be interesting to a larger pool of readers. So below I am reporting the answer, minimally edited.


:lol: at the term "spinning". Alastair Campbell gets everywhere.
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Re: Large Hadron Collider (LHC) News

#444  Postby lpetrich » Jun 19, 2012 5:31 pm

It's a two-step process. First, "reconstructing" an event, then "analyzing" or "spinning" those results.

"Reconstructing" would be such things as looking for jets or energetic photons / electrons / muons, followed by setting up hypotheses about their origins. Two energetic photons could be the result of the decay of a single particle, and from those photons' energies and directions, one can reconstruct its mass. But if they were not produced in that fashion, one gets a virtual-particle mass (quark-antiquark annihilation, for instance) or a fake mass (entirely separate origins). But one cannot tell at this stage which one it is.

"Analyzing" would be collecting several events to test various hypotheses, like the presence or absence of various particles. For the Higgs particle, it would be collecting the reconstructed masses and looking for a bump in them. The event rates for virtual-particle masses and fake masses will be smoothly-varying functions, while the decay event rate will be a thin bump. Strictly speaking, a Lorentzian / Breit-WIgner profile.


The ATLAS and CMS teams have a big deadline: this year's ICHEP, www.ichep2012.com.au > Home, 4-11 July.

I think that their highest priority will be the Higgs particle, since their almost-but-not-quite discovery of it has been their biggest news so far. Next up, I think, is limits on supersymmetric particles, notably squarks and the gluino.
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Re: Large Hadron Collider (LHC) News

#445  Postby newolder » Jun 20, 2012 4:44 pm

rumours... http://www.wired.com/wiredscience/2012/ ... gs-rumors/
Physics Community Afire With Rumors of Higgs Boson Discovery
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Re: Large Hadron Collider (LHC) News

#446  Postby Microfarad » Jun 20, 2012 4:56 pm

There are two categories of physicists: those who search for the Higgs boson and those who spread rumors about it. :mrgreen: :mrgreen:
Warning: the content of the post above may content inaccuracies, nonsense or insults to human intelligence. Read at your own risk.
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Re: Large Hadron Collider (LHC) News

#447  Postby newolder » Jun 20, 2012 5:13 pm

^ lol
3rd (class of physicist) can hunt an spread at teh same time? :dunno:
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Re: Large Hadron Collider (LHC) News

#448  Postby twistor59 » Jun 22, 2012 4:44 pm

http://press.web.cern.ch/press/PressReleases/Releases2012/PR16.12E.html


Geneva, 22 June 2012. CERN1 will hold a scientific seminar at 9:00CEST on 4 July to deliver the latest update in the search for the Higgs boson. At this seminar, coming on the eve of this year’s major particle physics conference, ICHEP, in Melbourne, the ATLAS and CMS experiments will deliver the preliminary results of their 2012 data analysis.

“Data taking for ICHEP concluded on Monday 18 June after a very successful first period of LHC running in 2012,” said CERN’s Director for Accelerators and Technology, Steve Myers. “I’m very much looking forward to seeing what the data reveals.”
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Re: Large Hadron Collider (LHC) News

#449  Postby newolder » Jun 22, 2012 4:59 pm

^ :thumbup:
“We now have more than double the data we had last year,” said CERN Director for Research and Computing, Sergio Bertolucci, “that should be enough to see whether the trends we were seeing in the 2011 data are still there, or whether they’ve gone away. It’s a very exciting time.”

:dance:
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Re: Large Hadron Collider (LHC) News

#450  Postby hackenslash » Jun 23, 2012 7:36 am

ImageImage
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Re: Large Hadron Collider (LHC) News

#451  Postby Microfarad » Jun 23, 2012 1:22 pm

6 fb-1 :dance:
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Re: Large Hadron Collider (LHC) News

#452  Postby byofrcs » Jun 24, 2012 4:20 am

ZZzzzzzzzz

Wake me when you lot find god.
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Re: Large Hadron Collider (LHC) News

#453  Postby newolder » Jul 02, 2012 12:58 pm

4 wednesday...
... Peter Higgs is one of those called to the press conference so the five physicists could be the five living Higgs founders who were honoured with the Sakurai prize in 2010 i.e. Englert, Higgs, Kibble, Guralnik and Hagen. Kibble confirmed that he was called but is unable to make it and told the Sunday Times ‘My guess is that is must be a pretty positive result for them to be asking us out there.’ ...

http://blog.vixra.org/2012/07/02/higgs- ... -for-cern/
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Re: Large Hadron Collider (LHC) News

#454  Postby CdesignProponentsist » Jul 02, 2012 4:04 pm

newolder wrote:^ lol
3rd (class of physicist) can hunt an spread at teh same time? :dunno:


That would require quantum physicists. :grin:
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Re: Large Hadron Collider (LHC) News

#455  Postby THWOTH » Jul 02, 2012 4:13 pm

:coffee:

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Re: Large Hadron Collider (LHC) News

#456  Postby DoctorE » Jul 02, 2012 4:16 pm

GENEVA (AP) — Scientists working at the world's biggest atom smasher plan to announce Wednesday that they have gathered enough evidence to show that the long-sought "God particle" answering fundamental questions about the universe almost certainly does exist.

But after decades of work and billions of dollars spent, researchers at the European Organization for Nuclear Research, or CERN, aren't quite ready to say they've "discovered" the particle.

Instead, experts familiar with the research at CERN's vast complex on the Swiss-French border say that the massive data they have obtained will essentially show the footprint of the key particle known as the Higgs boson — all but proving it exists — but doesn't allow them to say it has actually been glimpsed.

It appears to be a fine distinction.

Senior CERN scientists say that the two independent teams of physicists who plan to present their work at CERN's vast complex on the Swiss-French border on July 4 are about as close as you can get to a discovery without actually calling it one.

"I agree that any reasonable outside observer would say, 'It looks like a discovery,'" British theoretical physicist John Ellis, a professor at King's College London who has worked at CERN since the 1970s, told The Associated Press. "We've discovered something which is consistent with being a Higgs."

Continues: http://news.yahoo.com/apnewsbreak-proof ... 26045.html
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Re: Large Hadron Collider (LHC) News

#457  Postby THWOTH » Jul 02, 2012 4:30 pm

AP wrote:... almost certainly does exist ...

Sounds like there's a big 'but' coming. :ask:
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Re: Large Hadron Collider (LHC) News

#458  Postby newolder » Jul 02, 2012 7:33 pm

prolly a 4 sigma signal - 5 will haf 2 w8 a bit longer... iz mi gess. :dunno:
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Re: Large Hadron Collider (LHC) News

#459  Postby Dudely » Jul 03, 2012 11:58 am

Yeah they need to combine the data from ATLAS and CMS. They've done it- and they've got a sigma 5 from such a combination- but they want to be absolutely positively certain that it's right before they announce it. I doubt they will do so on Wednesday. It will probably have to wait until at least their meeting in October until they are comfortable releasing those findings.
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Re: Large Hadron Collider (LHC) News

#460  Postby newolder » Jul 03, 2012 3:41 pm

^ 2 x 4 sigma from 2 sepr8 speriments combined iznt enuff awlreddee? :ask:
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