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.
"In 1934, L.E.Kinsler at the California Institute of technology was studying the Zeeman effect as a means for evaluating the charge-to-mass ratio of the electron, e/m. The deduction of e/m from the measured wavelength differences involves, in addition to a high-precision measurement of the magnetic field, a knowledge of the way in which the individual electron spins and orbital angular momenta are coupled. However, there are certain quantities or combinations of quantities that are independent of the nature of the coupling.
One of the positive side-effects of preparing a seminar is being forced to get up-to-date with the latest experimental and theoretical developments on the topic. And this is of particular benefit to lazy bums like myself, who prefer to spend their time playing online chess than reading arxiv preprints.
It happened last week, in the course of putting together a meaningful discussion of the state of the art in global electroweak fits to standard model observables, and their implications for the unknown mass of the Higgs boson: by skimming the hep-ph
folder I found a very recent paper by a colleague in Padova, which I had shamefully failed to notice in the last couple of careless visits.
This afternoon I am leaving to Belgium. I have been invited by the Université Catholique de Louvain to give a seminar on the status and the future of the Higgs boson searches at the Tevatron collider. This was a good pretext to sit down and learn the latest details of the analyses carried out by CDF and DZERO, and to do some real work of my own, mainly to understand what are the discovery or exclusion prospects for the Higgs in the US in the next few years. I have somehow described my conclusions in a recent article