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Hadron jets

  1. May 8, 2007 #1


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    Dominant decays of W/Z bosons are quark aintiquark pairs which decay into jets of hadrons.

    But how can a quark decay into a hadron?

    Surely as hadrons are bound states of quarks then hadrons are heavier and so quark->hadrons violates mass conservation (energy conservation).

    I know i'm wrong but i can't see why.

    what am I missing?
  2. jcsd
  3. May 8, 2007 #2
    the process of quark->hadron is called fragmentation/hadronization. this precess is complicated. basically, there are three models: string fragmentation, independent fragmentation and cluster fragmentation. for string fragmentation, the basic idea is: two quark-anit quark connected by
    a string(because colour flux), the string carries energy(1 GeV/fm).as the quark-anti quark move apart, the potential energy stored in string increases, and then the string may break down then another two pair quark-anti quark are generated. (just image a string is break, and then a new pair quarks are generated at the each end of new string), this process recycled untile on-mass shell hadrons remain. so this hadron corresponding to a small piece of string with two quarks at each of end the string. these hadrons are mostly pions. this ideal also is called lund model

    but i am not a theorist and maybe there are some misunderestanding
  4. May 11, 2007 #3
    Another way to think of this is to consider the electromagnetisim. Atoms tend to be neutral instead of being charged.

    The only stable particle charged under strong force is color-singlet. Quarks carry color (the "charge" for strong force), r/g/b. one quark cannot be color-singlet. You have to take several quarks together, to make their colors "cancel" each other.
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