Mesons Definition and 56 Threads

Does anyone know how many there are, also how many are just thoeretical. We know of the proton, neutron, and election, but do we know that Tau and Muons exist? Also does anyone think we'll keep finding more

Interesting new Physics emerging? Link here:http://www.pparc.ac.uk/Nw/BABAR_CP.asp

A beam of charged pi-mesons is traveling with a speed of v=0.3c. The mean life of a pi-meson is 2.6 x 10^-8s. What is the mean distance traveled by a pi meson before it decays? How do u do this?

Last december I was asking for the possibility to couple the highest massive bosons to the nucleus. I was aiming for some kind of many body effect to give relevance to the total mass of the nucleus, besides the one of the independent nucleon. To get this, one expects the contribution of more...

The Standard Model defines Bosons, along with Fermions, as Fundamental Particles. At the same time, Mesons, which include Bosons, are supposed to be a compound made up of a quark and an anti-quark. So, which is it? Is a Boson a fundamental particle or a compound (ie.Hadron)?

http://physicsweb.org/article/news/7/11/3/ It's interesting to say the least, though of course it's not yet been reproduced. opinions? wild speculation?