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    How is Born Cross Section Related to Observed Cross Section?

    Hi everyone? What is Born cross section? And what is the relation between it and observed cross section? Thank you.
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    Classifying Quarks: Understanding Mesons, Baryons, and Quark Families

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    Classifying Quarks: Understanding Mesons, Baryons, and Quark Families

    when want to illustrate messon and bayyons , we put u,d,s together; but when talk about family we put u,d together and c,s together. why? I am really confused!
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    What Are the 8 Gluons and Their Role in Subatomic Physics?

    what are they?
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