No, unfortunately not yet the discovery of the century. Still, the new particle found by CMS in its 2011 dataset is a very important piece of the puzzle of low-energy spectroscopy. Here "low" should be taken with a pinch of salt: the new particle, an excited state of the Ξ_b series, has a mass only slightly lower than six GeV, and is thus "heavy" if compared to most other hadrons.

When I started a career in particle physics, joining the CDF experiment at the Fermilab Tevatron proton-antiproton collider about two decades ago, the search for a particle decay signal into hadronic jets was not something one would undertake lightly at a hadron collider: jets are omnipresent when you collide hadrons at high energy, so they constitute a irreducible background. Just as a detective looking for a blonde thief with swedish accent in Sweden, you would be close to clueless.

A couple of weeks ago the CDF and DZERO experiments have produced a combination of their measurements of the W boson mass. Besides two older determinations of this fundamental parameter of the Standard Model, the new 2.2/fb measurement by CDF and the 4.3/fb measurement by DZERO have been averaged together, accounting for correlated systematics. [x/fb is a shorthand for the amount of collisions from which the W boson datasets have been extracted by the experiments: 1/fb is about 80 trillion proton-antiproton collisions.]

I am just back from a vacation to Greece, where last Sunday was orthodox Easter. My fiancee Kalliopi is Greek, and it was about time for me for me to experience a bit of Greek customs. So we flew to Athens, and then headed to Salamina, where I had a lot of fun the Greek way in the company of a very cheerful dozen of relatives and friends.

Among the obligatory ingredients of a Greek Easter is the roasted lamb. It is cooked all in one piece, on a huge skewer, by rolling it for hours over hot coals. Its appearance is a bit disturbing at first, that is until the smell start to turn from that of a corpse to that of delicious food.  Below you can see me in front of the thing as it was already in the good-smelling and edible-looking phase.

For once I allow myself some self-advertising... I just published on the Cornell arXiv the preprint of a proceedings paper I wrote for the Bormio 2012 conference on Nuclear Physics, where I presented the most recent results from the CMS experiment in a review talk. The paper is titled "Recent Results of the CMS Experiment".

The paper is 33-pages long, and thus configures as a general review of the results that CMS produced from the analysis of data collected during 2011, the 5 inverse femtobarns of proton-proton collisions, which among other things granted a first feeble but trustworthy evidence of a Higgs boson when read together with similar ATLAS results.