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2Physics Quote:
"The exchange character of identical particles plays an important role in physics. For bosons, such an exchange leaves their quantum state the same, while a single exchange between two fermions gives a minus sign multiplying their wave function. A single exchange between two Abelian anyons gives rise to a phase factor that can be different than 1 or -1, that corresponds to bosons or fermions, respectively. More exotic exchanging character are possible, namely non-Abelian anyons. These particles have their quantum state change more dramatically, when an exchange between them takes place, to a possibly different state." -- Jin-Shi Xu, Kai Sun, Yong-Jian Han, Chuan-Feng Li, Jiannis K. Pachos, Guang-Can Guo
(Read Full Article: "Experimental Simulation of the Exchange of Majorana Zero Modes"
)

Thursday, October 20, 2005

One Decade of Top Quark

A decade ago in this week, experimental physicists representing seventy-four institutions in Brazil, Canada, Colombia, France, India, Italy, Japan, Korea, Mexico, Russia, Taiwan, and the United States announced the discovery at Fermilab of the top quark, a fundamental building block of matter and the universe.

The name "quark" was taken by Murray Gell-Mann from the book "Finnegan's Wake" by James Joyce. The line "Three quarks for Muster Mark..." appears in the fanciful book. Gell-Mann received the 1969 Nobel Prize for his work in classifying elementary particles. There are 6 different kinds of quark: Up, Down, Charm, Strange, Top and Bottom. Being in a confined state, they act as constituents of fundamental particles like Proton and Neutron but not, for instance, electron. The confinement of quarks implies that we cannot isolate them to measure their masses in a direct way. The masses and their existence must be implied indirectly from scattering experiments. To know more about quarks at your own pace, visit
these pages of hyperphysics.

Fermilab will celebrate 10 years of discovery of Top quark and the new possibilities it opened for science in a half-day symposium entitled "Top Turns Ten" on Friday afternoon, October 21, at Fermilab. The agenda is here.

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