An introduction to the quark model
An introduction to the quark model
An introduction to the quark model
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Few-charge systems His<strong>to</strong>ry of <strong>the</strong> <strong>quark</strong> <strong>model</strong> Mesons Baryons Multi<strong>quark</strong>s and o<strong>the</strong>r exotics Outlook<br />
First hadrons: antinucleons<br />
Bevatron built at Berkeley for antinucleons<br />
¯p seen in 1955 by Ypsilantis, Segrè and Chamberlain,<br />
¯n shortly after ( ¯ d a little controversial),<br />
Also <strong>the</strong> cross-sections of ¯p,<br />
With <strong>the</strong> unexpected<br />
σann > σel<br />
Because nucleons and antinucleons are not pointlike!<br />
Because ¯ NN annihilation differs from e + e annihilation in QED!<br />
JMR Quark Model