The Plot Of The Week: Light New Bosons Below The J/Psi

The graph below, I hope you'll agree, is significantly cooler and better-looking than the typical...

An Easy Problem

Yesterday I chaired the selection committee to choose the student who will be hired in the AMVA4NewPhysics...

Nobel Prize To Neutrino Oscillations

The winners of the 2015 Nobel Prize in Physics are: Takaaki Kajita Kajita (Super Kamiokande)...

Thank You Guido

It is with great sadness that I heard (reading it here first) about the passing away of Guido Altarelli...

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Tommaso DorigoRSS Feed of this column.

I am an experimental particle physicist working with the CMS experiment at CERN. In my spare time I play chess, abuse the piano, and aim my dobson telescope at faint galaxies.... Read More »

This is a good year for summer meteor watching. The moon, just past new, will not interfere with observations of faint meteors. And the Perseid shower, originated from the dust left behind in the orbit of comet Swift-Tuttle, will produce a nice show. 

Perseids are a rather stable stream, and they produce a detectable rate of meteors from late July to late August, with peaks in the nights of August 11th and 12th, depending on the exact trajectory that the Earth takes while plunging in the dust-ridden area of the solar system. The rate is usually encoded in the acronym "ZHR", for zenith-hourly-rate. ZHR values of 100 to 150 are common for the two highest-rate nights.

But what exactly should you expect to see ?
CDF and DZERO, the two experiments at the Fermillab Tevatron collider, have studied top quark production since their own discovery of the heavy particle in 1995 (see here, here, and here for a three-post history of the top quark quest).
In Athens

In Athens

Aug 06 2010 | 3 comment(s)

No, this is not about Physics. No, you are probably not interested. No, this blog is not only about science. I sometimes use it as -guess what- a log book, a diary. A habit I have learned five years ago, as I walked my first steps in the world of blogging, here. They (the organizers of "Quantum Diaries") wanted me to write about my life, and they got it. I learned a job, and some weird habits, like talking about my private life in public. It never caused much trouble, not nearly as much as just writing good articles on particle physics!
What picture should we draw of the quest for new phenomena after the presentation of a wealth of new results at the international conference on high-energy physics in Paris held last week ? I am speaking in particular of results coming from the experiments at the Tevatron and LHC, which are all studying hadron collisions in search for still unseen effects to both confirm (with the discovery of the Higgs boson) or break down (with the observation of Supersymmetry, new particles, extra dimensions, or still other effects) the present theoretical understanding of fundamental physics which the standard model provides us with.
"I don't want to achieve immortality through my work... I want to achieve it through not dying"

Woody Allen
After the issuing of new top mass results by the Tevatron experiments, it is time for another look at global electroweak fits of standard model observables. The Gfitter group has produced new fits for the standard model in search of the most probable value of the Higgs boson mass, given the new measurements of top quark mass and other quantities, and the huge amount of existing information on sensitive observables from the standard model.

Unfortunately, I could find no update including the new Higgs search results yet. I guess such a fit will be ready in a few weeks... But the new released information is already interesting enough that we may meaningfully spend a few words around some figures here.