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fundamental particles

Measuring Fundamental Constants with Methanol

June 13, 2011

Want to stay on top of all the space news? Follow @universetoday on Twitter   Key to the astronomical modeling process by which scientists attempt to understand our universe, is a comprehensive knowledge of the values making up these models. These are generally measured to exceptionally high confidence levels in laboratories. Astronomers then assume these [...]

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Leptons

December 7, 2009

As far as we know, all matter in the universe is composed of two kinds of particles, the hadrons (from which the LHC – Large Hadron Collider – gets its name) and leptons. Hadrons are not fundamental particles, in the sense that they are known to be composed other particles (quarks, and anti-quarks); leptons, on [...]

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Hadron

November 15, 2009

If a particle contains quarks, and is held together by the strong force, it is a hadron. As far as we know, only two combinations of quarks – and thus two kinds of hadron – are possible: three quarks, which is called a baryon (e.g. proton, neutron), and a quark and anti-quark, which is called [...]

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Electron Mass

November 15, 2009

The mass of the electron, or the electron’s mass, written as me, is 9.109 382 15(45) x 10-31 kg. This is the “CODATA recommended value”. It was published in March 2007, and is referred to as the 2006 CODATA recommended value. Some background: CODATA stands for Committee on Data for Science and Technology. Per NIST [...]

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Baryon

November 15, 2009

Particles made up of three quarks are called baryons; the two best known baryons are the proton (made up of two up quarks and one down) and the neutron (two down quarks and one up). Together with the mesons – particles comprised of a quark and an antiquark – baryons form the hadrons (you’ve heard [...]

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