Physics
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Where do the SM
universal flavor mass and mixing hierarchy patterns come from? At leading approximation (without free
external parameters) all…
Yesterday I chaired the selection committee to choose the student who will be hired in the AMVA4NewPhysics network by the Padova section of INFN, and during the interviews I asked all candidates a couple of "easy" physics questions, meant to test the students' reasoning process rather than their prior knowledge.
The first question was only apparently easy - even too much, from the outset. The fact is, the devil is always hiding in the details, as I immediately realized as I tested it by asking an experienced colleague to answer it. He got part of the question wrong, but in doing so he…
How does knowing that neutrinos have mass, and change from one kind of particle to the other kind benefit all mankind? Why should Takaaki Kajita and Arthur B. McDonald get a Nobel Prize for finding this? What the heck is a neutrino anyway? How does the impact of science like basic Physics or Astronomy compare to say… lung cancer research in terms of the immediacy of the impact? In short why should the normal average person care about Neutrinos? In a tweet, a better understanding of the basic forces particles and fields that comprise the material world will…
The winners of the 2015 Nobel Prize in Physics are:
Takaaki Kajita Kajita (Super Kamiokande)
Arthur McDonald (Sudbury Neutrino Observatory - SNO)
“for the discovery of neutrino oscillations, which shows that neutrinos have mass"
I think this is a well deserved recognition to a field of physics which has seen an incredible rise in the last twenty years. Neutrino physics has boomed when it was discovered that neutrinos oscillate between different flavours, thus explaining a 30-year-long puzzle concerning the deficit of neutrinos coming from the sun.
Neutrinos are the lightest elementary…
It is with great sadness that I heard (reading it here first) about the passing away of Guido Altarelli, a very distinguished Italian theoretical physicist. Altarelli is best known for the formulas that bear his name, the Altarelli-Parisi equations (also known as DGLAP since it was realized that due recognition for the equations had to be given also to Dokshitzer, Gribov, and Lipatov). But Altarelli was a star physicist who gave important contributions to Standard Model physics in a number of ways. Those who knew him remember him for his human qualities more than for him equations, but these…
Last Friday I was invited by the University of Padova to talk about particle physics to the general public, in occasion of the "Researchers Night", a yearly event organized by the European Commission which takes place throughout Europe - in 280 cities this year. Of course I gladly accepted the invitation, although it caused some trouble to my travel schedule (I was in Austria for lectures until Friday morning, and you don't want to see me driving when I am in a hurry, especially on a 500km route).The idea of bringing general public and researchers close together for one evening is of course a…
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The remarkable coincidence of the empirical Pythagorean
equation for SM flavor hierarchy angles with the outer euclidean symmetry
3-space metric equation for constant vector direction angles is the data evidence
of basic connection between flavor phenomena and geometry of outer euclidean
3-space. It relates three SM particle generations to the three dimensions of
euclidean space. There is no more important problem in the phenomenology of the
Standard Model than the problem of elementary particle mass and mixing flavor
hierarchies. We…
This is just a short post to mention one thing I recently learned from a colleague - the ATLAS experiment also seems to have collected a 5.3 TeV dijet event, as CMS recently did (the way the communication took place indicates that this is a public information; if it is not, might you ATLAS folks let me know, so that I'll remove this short posting?). If any reader here from ATLAS can point me to the event display I would be grateful. These events are spectacular to look at: the CMS 5 TeV dijet event display was posted here a month ago if you like to have a look.5 TeV and above are still terra…
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Motivation for Majorana Neutrinos from Special
Empirical Hierarchies
…
In Part A, the core idea behind the space-times-time invariance as gravity was detailed. When one treats events as a 4-vector, the contraction of that 4-vector generates one number. When one treats events as quaternions, the square of a quaternion generates 4 numbers. If for two observers, the first number in the square is identical while the other three (I call space-times-time) are different, then the two observers are moving at a constant velocity relative to each other. The space-times-time proposal is exploring the case where the observers disagree about the interval, but have the same…