Search found 168 matches

by mfb
Sat Dec 10, 2016 7:25 pm
Forum: Science
Topic: LHC's Newest Data: A Victory For The Standard Model, Defeat…
Replies: 20
Views: 12089

Re: LHC's Newest Data: A Victory For The Standard Model, Def

Ethan said the same thing, that it is unlikely. His conclusion is that it's better to call it quits. His statement is much stronger than that: It means that colliders aren’t the answer. It means the LHC won’t reveal new physics, and that particle creation, decays and branching ratios won’t shed the...
by mfb
Sat Dec 10, 2016 1:42 pm
Forum: Science
Topic: LHC's Newest Data: A Victory For The Standard Model, Defeat…
Replies: 20
Views: 12089

Re: LHC's Newest Data: A Victory For The Standard Model, Def

Well of course hardly anyone 'within' the field of high-energy particle physics is going to be critical about their own bread and butter. That statement is wrong. There are several physicists in high-energy physics with pessimistic outlooks. The difference to Ethan Siegel: they do not rule out the ...
by mfb
Sat Dec 10, 2016 12:42 am
Forum: Science
Topic: LHC's Newest Data: A Victory For The Standard Model, Defeat…
Replies: 20
Views: 12089

Re: LHC's Newest Data: A Victory For The Standard Model, Def

Try to find all his LHC-related papers. At arXiv ? Maybe at inspire ? Nothing. He is working on astrophysics, and while there is some overlap between astrophysics and high-energy physics, he doesn't seem to work in this overlap region. Concerning the blog comment, I was referring to this: From Anony...
by mfb
Wed Dec 07, 2016 9:20 pm
Forum: Science
Topic: LHC's Newest Data: A Victory For The Standard Model, Defeat…
Replies: 20
Views: 12089

Re: LHC's Newest Data: A Victory For The Standard Model, Def

Ethan collected some comments from others and commented on them. His comment is better than the comment he replied to, but it is still his personal opinion (and not clearly marked as such) - and I'm not even sure about that, he could just explain what it means if the large gap is real. What exactly ...
by mfb
Tue Dec 06, 2016 9:50 pm
Forum: Science
Topic: LHC's Newest Data: A Victory For The Standard Model, Defeat…
Replies: 20
Views: 12089

Re: LHC's Newest Data: A Victory For The Standard Model, Def

What a misleading title. "Oh look at this soccer match! 16 seconds passed and no goal yet! I'm sure the match will end 0:0." The 16 seconds are not chosen randomly, they are the equivalent ratio the LHC has now with analyzed to future data. The latest search results at these high energies were just ...
by mfb
Sat Nov 26, 2016 7:57 pm
Forum: Science
Topic: ATLAS sees light-by-light scattering for the first time
Replies: 6
Views: 6500

Re: ATLAS sees light-by-light scattering for the first time

Those are not "my own ideas", those are things particle physicists (including me, but every individual physicist only has a small role) discovered.
by mfb
Sat Nov 26, 2016 5:40 pm
Forum: Science
Topic: ATLAS sees light-by-light scattering for the first time
Replies: 6
Views: 6500

Re: ATLAS sees light-by-light scattering for the first time

Could you please keep your misunderstood pop-science descriptions and personal crackpot ideas out of threads discussing actual science please?
by mfb
Sat Nov 26, 2016 2:20 am
Forum: Science
Topic: ATLAS sees light-by-light scattering for the first time
Replies: 6
Views: 6500

Re: ATLAS sees light-by-light scattering for the first time

Virtual particles are a mathematical tool only. And there are no "atoms that surround the collision center".
by mfb
Sat Nov 19, 2016 2:59 pm
Forum: Science
Topic: ATLAS sees light-by-light scattering for the first time
Replies: 6
Views: 6500

ATLAS sees light-by-light scattering for the first time

A process searched literally for centuries... found (4.4 sigma). Lead-lead collisions allow to study the "collision" of their intense electromagnetic fields, and while pair production has been seen long ago, pure photon scattering (2 photons -> 2 photons) is even less frequent. ATLAS saw 13 events w...
by mfb
Wed Oct 26, 2016 9:45 pm
Forum: The Accelerator
Topic: 2016 operation
Replies: 52
Views: 29725

Re: 2016 operation

And done.... last run with proton-proton collisions was dumped half an hour ago. 40/fb (CMS quotes 41.5, ATLAS 38.5) for the high-pileup experiments, 1.9/fb for LHCb. The dataset not shown at ICHEP exceeds the datasets of everything shown up to ICHEP for nearly every analysis in all three mentioned ...
by mfb
Fri Oct 21, 2016 8:51 pm
Forum: The Accelerator
Topic: 2016 operation
Replies: 52
Views: 29725

Re: 2016 operation

The LHC now tests lumi levelling for ATLAS and CMS.

"That won't work for LHCb and disturb the beams for our own measurements" -> "Well, let's try, it might work" -> "Okay that works for LHCb, fine" -> "Hmm, that could be interesting for us" -> "We also want it" ;)
by mfb
Sat Oct 15, 2016 11:39 am
Forum: The Accelerator
Topic: 2016 operation
Replies: 52
Views: 29725

Re: 2016 operation

They made a high pileup test yesterday. Bunch trains with ~50 collisions per interaction, and a few individual bunches with 90-95 collisions. That is about 4 times the design value, and not far away from the HL-LHC conditions (140, maybe up to 200). 470/510 /pb after 16 hours so far, injector proble...
by mfb
Sun Oct 09, 2016 2:48 pm
Forum: The Accelerator
Topic: 2016 operation
Replies: 52
Views: 29725

Re: 2016 operation

The last MD block is over, 17 more days for pp physics until the LHC switches to heavy ions. CMS quotes 34.1/fb delivered, ATLAS 31.9/fb. Looks like both experiments will end up with more than 35/fb, with CMS potentially reaching 40/fb. We'll see how much of this difference is just calibration and h...
by mfb
Mon Sep 26, 2016 11:36 pm
Forum: The Accelerator
Topic: 2016 operation
Replies: 52
Views: 29725

Re: 2016 operation

The machine operators have shown a lot of creativity to improve the luminosity this year, despite various limitations (SPS beam dump, injection, ...). And the availability is just amazing.

With 35-40/fb this year and 40-45 in 2017 and 2018 we get ~1/4 more than the earlier plan of 100/fb for run 2.