The CDF collaboration has recently released new results from a search for what is probably the clearest signature of Higgs boson decay: pairs of high-mass photon candidates. I am very glad to see this new analysis out for publication, since so far only DZERO, CDF's competitor at the Tevatron, had produced results
on this particular final state.
Science Fun With A Hot Drink
Here is a most enjoyable physics experiment that anyone can do almost anywhere.
You will need:
1 hot drink,
1 comfortable chair,
1 table or desk.
You will not need:
Having made yourself a nice steaming hot drink, sit in the chair and put the cup on the table.
You may, if preferred, put the cup on the table and then sit down. This will in no way affect the validity of the results. However, if you sit on the table and put the chair on the cup you are likely to invalidate the entire experiment, so stop being so silly!
The T2K (Tokai-to-Kamioka) project has tracked their first neutrino, one of the least understood particles in the universe. The detection of the neutrino as it passed 185 miles from the East to the West of Japan means the study of the mysterious phenomenon of neutrino oscillations may shed more light on the role of the neutrino in the early universe, or perhaps even help answer questions about why there is more matter than anti-matter in the universe.
"Neutrinos are the elusive ghosts of particle physics, T2K spokesperson Takashi Kobayashi said."They come in three types, called electron neutrinos, muon neutrinos, and tau neutrinos, which used to be thought to be unchanging. This is a big step forward, we've been working hard for more than 10 years to make this happen."
We live in an expanding universe. Distant galaxies move away from us, and these galaxies see us moving away from them. If we reverse time and trace back this expansion, it follows that the universe has evolved from a dense primeval/primordial state.
The big bang concept summarized in three sentences.
One of the few physics measurements that the LHC experiments are already in the position of producing, with the week-worth of proton-proton collision data they have collected last December, is that of the Bose-Einstein intereference between identical bosons.
There are twenty-four elementary fermions in the standard model. Sure, they are arranged in a very tidy, symmetrical structure of three families of eight fermions (two leptons and six quarks), which is not too unpleasant to behold. And of course, if one is willing to forget the fact that the quantum-chromodynamical charge of quarks does make them different, then the picture is even tidier: 12 fermions, six of them quarks and six of them leptons, arranged in three families of four.
It has become a pleasant habit for me to visit Bassano del Grappa every February for a conference on particle physics aimed at high-school students. Thanks to the efforts and the skill of dr. Sergio Lucisano, the schools of Bassano organize every year several conferences on physics and cosmology. These conferences are connected with the european program of the Masterclasses, but they extend the scope considerably into the history of physics and other topics of interest for the students.
The phenomenon, by which perihelion of elliptical orbital path of a planet appears to rotate around a central body, is known as the precession of the orbital path. Since the precession of mercury’s orbital path is much greater, compared to the precession of orbital paths of other planets, it has attracted much attention.
I remember very well the very first meeting of the Heavy Flavour Working Group in CDF that I attended in the summer of 1992. I was a summer student back then, and my understanding of spoken English was not perfect, so as a graduate student started discussing with his slides the results he was getting on the top quark mass reconstructed in simulated single-lepton top pair decays, I struggled to follow his talk -the physics was just as hard to follow as the English.