Comprehensible, in depth modern particle physics lecture

A lecture on high energy particle physics and the nature of the universe that ISN'T dumbed down to the point of being useless and insulting (ie. NOVA/Horizon), yet remains accessible to the layman. I don't expect this to make it out of the queue but it is nice for the hard core science geeks out there. ;o)
Claytonsays...

An interesting article about Peter Higgs, a humble guy who says:

"Most of what has been attached to my name should not have been," he replies, "but probably the Higgs boson is correctly attached because I was probably the person who drew attention to it most in my papers. However, as far as the mechanism of generating vector boson masses is concerned, I usually write down a whole string of names, starting with Anderson and including Englert and Brout, Gerald Guralnik, Dick Hagen and Tom Kibble, and also Gerard 't Hooft."
http://physicsweb.org/articles/world/17/7/6

The physicist in the video, Kim Griest, says the typical theoretical upper bound for mass of higgs boson is around 1 TeV. He, personally thinks around "1000 GeV" is where it should be, "maybe up to 2000 GeV". Yet, Jos Engelen, CERN's chief scientific officer, who's been at CERN since 1971, say's "LEP showed that the Higgs was heavier than 114.4 GeV, and we can also guess its mass from other experiments. Within the Standard Model we know that it is not heavier than 240 GeV at the 95% confidence level." Engelen says that the LHC will only be able to produce pairs of Higgs bosons if the Higgs mass is less than 500 GeV. Hmmm, I remain thoroughly confused
http://physicsweb.org/articles/world/17/9/7

The New York Times has a suprisingly good, and lenghty, article about the LHC with nice multimedia:
http://www.nytimes.com/2007/05/15/science/15cern.html?_r=1&oref=slogin

CERN has a metric shitload of media and info here:
http://press.web.cern.ch/press/
- It kinda bugs me that they have such a strict copyright on their media. Isn't it predominantly publicly funded?

Perspective on collision energies:
The LEP, the predicessor to LHC, prior to going offline in 2000, topped out at --- 104 GeV.
The Tevatron at Fermi National Accelerator Laboratory is running at ---------------- 1.96 TeV.
The LHC will initially be capable of colliding beams of protons at an energy of -- 14 TeV.
The abandoned SSC project here in the US would have been capable of --------- 40 TeV.

gluoniumsays...

keep in mind that this talk is about 3-4 years old. Since then, (in the last year) the mass of the Top quark has been constrained to within 1% and this has allowed an inferred upper limit estimate (with 95% confidence limit) of the Higgs mass to be 144 GeV or less. LEP searched to 114 GeV and the Tevatron can search up to something like 170 GeV. It would appear to be all down to luminosity of the collider now. Tevatron has collected 1 inverse femtobarn of collision data in the past year, that number should be brought up to 8 inverse femtobarns before the facility has to close in 2009. I think they can fand it before the LHC.

Claytonsays...

Thanks gluonium, I've read so many estimates as to mass of the Higgs from various sources that I was having difficulty. Everything becomes dated so quickly:

"With those effects taken into account, the Tevatron should be able to unearth evidence of the Higgs if the particle’s mass is less than 125 GeV. “While a Higgs search up to 125 GeV may sound limited, that’s exactly the range where we would expect to find it,” Buescher says. With 8 inverse femtobarns of data, researchers should be able to spot solid evidence, if not incontrovertible proof, of a Higgs in that range—if it’s there."

SCIENCE VOL 312 2 JUNE 2006
http://www.physics.mcgill.ca/~awarburt/Science_20060602.pdf

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