The DZERO collaboration just sent to the Cornell ArXiv a paper
which presents their new precise cross-section limits for the rare decay of
mesons into pairs of muons. This important new article hides a small controversy, at least to my untrained eye. And since I am a bitch who thrives in the mud of controversies (or, at least some would describe me that way), let me do precisely that here.
The CDF Collaboration has recently produced results of a search for Supersymmetric Higgs bosons in events with three or more bottom-quark jets. Here I wish to give just the highlights of this analysis, but before I do I will try to spend 5' on making sense of the previous sentence.
In good order, below I explain first of all 1) what is CDF, 2) what is the Tevatron, 3) what are Higgs bosons from Supersymmetry, 4) how can these be sought with bottom quarks, and 5) what are bottom quark jets. After I am done with these five explanations, those of you who are still here will no doubt appreciate the results I am showing today. Can I make it in 5 minutes ? Sure, but can you read forty lines of text in the same amount of time ?
Today, for the first time in 18 years of association to the Italian National Institute of Nuclear Physics (INFN), I leave for a trip abroad, to the CERN laboratories, on my own wallet.
The situation into which basic research has been thrown by our crazy government borders the ridiculous, but is pretty darn serious. Italian physicists often travel to foreign laboratories to attend their apparata, collect data, perform their research, discuss with colleagues. If they lose money to do this, they will stop their foreign activities. I think in particular at graduate students and young post-docs, who earn salaries insufficient for a living, and whose per-diem compensation when abroad used to allow them to cover their expenses.
Today is a good day: I can rest in peace without working out my daily share of science popularization here, because I have something better to do, which will have a much more sizable positive effect for the diffusion of particle physics. In fact, I hold in my hands a brand new copy of Gian Francesco Giudice's book, "A Zeptospace Odyssey - A Journey into the Physics of the LHC". All I have to do is to explain to you why you really should buy, read, and give as a present this book to all your friends.
Gian Francesco Giudice
Is David Beckham a keen physicist? Though he wouldn't know how to do the equations on a chalkboard, he certainly does it in his head and then with his feet - so perhaps he is an experimental physicist at heart.I've often used baseball
to talk about concepts such as drag, the Bernoulli principle, Reynolds number and the Magnus effect but Beckham's ability to curve the football so much can teach the same things.
The Bernoulli effect tells us faster moving air reduces pressure and a pressure difference is on either side of the ball creates a net force called the Magnus effect:
In my friend Peter Woit's blog I read an interesting account of an interview to Greene and Kachru, two leading string theorists. Here is an excerpt, which Peter got from the World's Science Festival:
John Hockenberry, the panel’s moderator, asked Greene if he thought experimental evidence would come during his lifetime.
“I’d be surprised,” said Greene.
“And in your lifetime?” Hockenberry asked Kachru.
"I do not understand why journalists and others want to know about the latest discoveries in physics even when they know nothing about the earlier discoveries that give meaning to the latest discoveries"
Richard Feynman (quoted by G.F.Giudice, "A Zeptospace Odyssey", Oxford University Press 2010)
Ah, the joy to see bosons in our first 7-TeV proton-proton collisions at LHC! The CMS experiment has released two days ago its first results on W and Z bosons, plus many other riches. Of course, these plots are only demonstrative, since the statistics is still ridiculously poor if compared with the wealth of data available at the Tevatron. But still, these are collisions at 3.5 times more energy, and the machine is doubling its luminosity every week or so, so I expect that very soon the distributions will stop looking rough and will start containing real information, to be converted in meaningful measurements of the relevant physical quantities.
It is Sunday morning, and I am about to leave for a day on the beach, the first of this busy 2010; so this post will be shorter than I would like it to be... There would be lots to say about exclusive physics at colliders. But I still want to share with you a figure extracted from a recent 4-page preprint article by James Pinfold
, who nicely summarizes the signals and searches for exclusive processes at the Tevatron proton-antiproton collider.
After two years spent saying that Italy has a strong economy and is doing better than the rest of Europe, and strongly criticizing whomever tried to warn that the economical crisis was not over yet, the Italian government led by Silvio Berlusconi has made a sharp turn. The buzzword is now "avert the Greek risk", and while painting dreadful scenarios Berlusconi and his ministers have crafted a finance law that drags over 30 billion euros mostly from salaries. The anti-Robin-Hood strikes again.