Quark, Lepton, Muon, Neutrino, Electron, Neutron

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lukman

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How to arrange from biggest to smallest? Quark, Lepton, Muon, Neutrino, Electron, Neutron. Can anyone explain the purpose of them in relationship with a matter? (In easy way to understand English) <div class="Discussion_UserSignature"> </div>
 
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kmarinas86

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<pre>LIGHTEST<br />Electron Neutrino = 0.000002 MeV/c^2<br />Muon Neutrino = 0.170 MeV/c^2<br />Electron = 0.511 MeV/c^2<br />Up Quark = 4 MeV/c^2<br />Down Quark = 8 MeV/c^2<br />Tau Neutrino = 15.5 MeV/c^2<br />Muon = 105.6 MeV/c^2<br />Proton = 938.272 MeV/c^2<br />Neutron = 939.565 MeV/c^2<br />Strange Quark = 1,500 MeV/c^2<br />Tau = 1,777 Mev/c^2<br />Bottom Quark = 4,700 MeV/c^2<br />Charm Quark = 15,000 MeV/c^2<br />Top Quark = 176,000 MeV/c^2<br />HEAVIEST<br /></pre><br /><br />http://en.wikipedia.org/wiki/Neutrino<br />http://www.google.com/search?q=electron+mass+in+MeV%2Fc%5E2<br />http://www.google.com/search?q=proton+mass+in+MeV%2Fc%5E2<br />http://en.wikipedia.org/wiki/Lepton<br />http://www2.slac.stanford.edu/vvc/theory/quarks.html
 
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kyle_baron

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<i><br />One should point out that quarks have never been observed. They are theoretical particles creeated to make sense of the vast numbers of particles seen. But they do NOT have the status of being real or existing.</i><br /><br />Huh? From The Elegant Universe p. 7: "...But in 1968 experimentors at The Stanford Linear Acceleration Center...found that protons and neutrons are not fundamental either. Instead they showed that each consists of 3 smaller particles called quarks." p.8: "In the debris they have found four more quarks-charm, strange, bottom, and top." Do you know something that physist Brian Greene doesn't know? <div class="Discussion_UserSignature"> <p><font size="4"><strong></strong></font></p> </div>
 
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search

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Even "free quarks" may not be "convenient theoretical fictions".<br /><br />From;<br />http://chandra.harvard.edu/photo/2002/0211/index.html<br /><br />Chandra observations of RX J1856.5-3754 and the pulsar in 3C58 suggest that the matter in these collapsed stars is even denser than nuclear matter, the most dense matter found on Earth. This raises the possibility that these stars are composed of free quarks or crystals of sub-nuclear particles, rather than neutrons.<br /><br />By combining Chandra and Hubble Space Telescope data, astronomers found that RX J1856 radiates like a solid body with a temperature of 700,000 degrees Celsius and has a diameter of about 7 miles.<br /><br />This size is too small to reconcile with the standard models of neutron stars. One exciting possibility, predicted by some theories, is that the neutrons in the star have dissolved at very high density into a soup of "up," "down" and "strange" quarks to form a "strange quark star," which would explain the smaller radius.<br /><br />Observations of 3C58, the remnant of a supernova noted on Earth in AD 1181, reveal that the pulsar in the core has a temperature much lower than expected. This suggests that an exotic, denser state of matter might exist inside this star as well.<br /><br />These observations demonstrate that the universe can be used as a laboratory to explore physics under conditions that are not accessible on Earth.
 
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larper

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I didn't think that the Top quark had been seen yet, and that its mass only has a lower limit at this point. <div class="Discussion_UserSignature"> <p><strong><font color="#ff0000">Vote </font><font color="#3366ff">Libertarian</font></strong></p> </div>
 
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search

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From wiki:<br />http://en.wikipedia.org/wiki/Top_quark<br />The top quark is the third-generation up-type quark with a charge of +(2/3)e. It was discovered in 1995 by the CDF and D0 experiments at Fermilab, and is by far the most massive of the quarks. Its mass is currently measured at 171.4±2.1 GeV [1], nearly as heavy as a gold nucleus.
 
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kyle_baron

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<i><br />I didn't think that the Top quark had been seen yet,...</i><br /><br />Who cares if you can see it? If it leaves a trail in the debris, it has to exist. Quarks have to be small, in order to fit inside the protons and neutrons. <div class="Discussion_UserSignature"> <p><font size="4"><strong></strong></font></p> </div>
 
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