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Submission + - Decay: A Zombie Film Set at the LHC (decayfilm.com) 1

ssam writes: I'm part of a group of physics PhD students who are about to release a feature-length zombie film, shot entirely on location at CERN near Geneva (although not officially authorised by CERN). It was filmed on borrowed DSLRs on home made rigs with a non-existant budget, and will be released online in a few weeks under a CC-BY-NC licence. For now there's a trailer on the site and youtube to whet your appetite!

The film follows a small group of students (played by physicists) after a disastrous malfunction in the LHC. As they try to escape from the underground maintenance tunnels, they are hunted by the remains of a maintenance team, who have become less than human.

Comment Only 95%? (Score 2, Insightful) 198

I am surprised they conclude the fraction of good mails is as high as 5%.

From the CERN mail server report:

Incoming mails: 1992789
Rejected: 1952787 (98%)
Moved to Spam Folder: 14520 (1%)
Good mails: 25482 (1%)

Spam in Total 99%

And this is a good day. Often good mails are less than 1%.

Comment Re:Only solving half the problem... (Score 1) 361

if you work out what the time dilation effect is at 1.5c [...]

You can't, sqrt(1 - 1.5c/c) is not a real number, that's the whole point.

Btw. the form of this factor in the Lorentz transformations follows from a few very fundamental assumptions. The limiting speed 'c' appearing in the formula on the other hand can not be derived from first principles. So a priori it could be anything. We do know from experiment, however, that this speed is in fact the speed of light.

Comment Re:Couple of questions.. (Score 2, Informative) 217

a) Combining quarks into hadrons in different ways leads to different properties of the resulting bound state. The mass is an obvious example. Unfortunately, while rather easily accessible experimentally, it is hard to predict the mass of bound states with high precision in QCD (the theory describing the strong force). Others properties can be more powerful here. For example the intrinsic angular momentum (spin) and the parity of the bound state. The decay product trajectories from particles with different spin/parity will show different angular distributions. By measuring these distributions one can rule out certain combinations.

b) In general what would be required is someone working out in more detail how these predicted particles would interact with known particles, in this case charm and strange quarks. I just read through the article you linked to. According to the article, all predicted particles are gauge bosons, i.e. they introduce new interactions. The number in the name Y(4140) refers to the mass measured in MeV. A gauge boson with such a low mass coupling to quarks would have been noticed already. Furthermore, the reported observation does not hint anything exotic. Just something that is perfectly allowed in the Standard Model, although not fully understood in its dynamics yet. So I'm afraid, no, this is not a candidate for your favourite model.


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