Of Particular Significance

Blog – Of Particular Significance

Greetings from Grenoble, and the EuroPhysics conference.  There’s so much data being described, and there are so many simultaneous talks, that it is hard to make sure I’m getting all of the new information.  And there’s a huge amount of news, which will take a while to summarize.

Before I do, I should say that so far everything is going more or less as I expected.  There are a lot of new results from the Tevatron (the CDF and DZero experiments), a number of which are controversial.  Meanwhile there are a number of a new results from the Large Hadron Collider [LHC] (the ATLAS, CMS and LHCb experiments mainly), few of them so far controversial. And the LHC experiments have shown results contradicting one of the controversial Tevatron results, one I wrote about a few days ago.  Meanwhile many LHC measurements that were made preliminarily with the 2010 data set have not yet been updated for the relatively large 2011 data set.  Why did I expect that?  See the article I wrote about this yesterday.

But the search for the Standard Model Higgs particle (the simplest possible version of the Higgs particle, or particles) is moving along quickly, and there is a lot of new data on the search coming out today from the LHC and from the Tevatron.  There has already been significant progress shown this morning, and additional important talks are scheduled to happen in the next few minutes.

Picture of POSTED BY Matt Strassler

POSTED BY Matt Strassler

ON July 22, 2011

No less than Fox News reports that Fermilab has found a new particle!  And it’s true, but this is one of those places where the word “particle” is not descriptive.  This is a new [but totally expected!] HADRON, a particle made from other known particles — quarks, antiquarks and gluons.

(more…)

Picture of POSTED BY Matt Strassler

POSTED BY Matt Strassler

ON July 21, 2011

Greetings from Grenoble and the European Physical Society conference!  Lots of new data to review!  I’ll have more to say on that over the next days.

Meanwhile, you might be wondering, as have been many particle physicists, why the Tevatron experiments CDF and DZero are seeing so many deviations from the Standard Model recently.  Here’s a post with my best guess as to why this is happening.

Picture of POSTED BY Matt Strassler

POSTED BY Matt Strassler

ON July 21, 2011

Starting Thursday, the big EuroPhysics conference on particle physics, in Grenoble, France. 400 talks! I am trying to figure out how to attend four simultaneously…

Picture of POSTED BY Matt Strassler

POSTED BY Matt Strassler

ON July 19, 2011

Ok, folks, the web site “Of Particular Significance” is officially open for business.  A few articles, posts and video clips are up,  and news from the first big LHC summer conference starts flowing in later this week!  Take a look around and check back often…

Picture of POSTED BY Matt Strassler

POSTED BY Matt Strassler

ON July 19, 2011

I posted on Friday that the CDF experiment at the Tevatron claims to have observed a long-sought rare process — the decay of a particle called the B_s meson to a muon and anti-muon — and the observed rate is at least 1.5 times and perhaps as much as 6 times what was expected in the Standard Model.  After some careful reading, I have updated my post, laying out some reasons for some caution in interpreting the result.  I still don’t have the full story, so there will probably be another update.  (7/16/11)  

Picture of POSTED BY Matt Strassler

POSTED BY Matt Strassler

ON July 17, 2011

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