QCD and the Space-Time Evolution of High-Energy e+e, \(p\bar p\), and Heavy Ion Collisions

  • J. D. Bjorken


With QCD the generally uncontested theory of the strong interactions, it is natural that descriptions of high energy collisions nowadays tend to use the QCD language of quarks and gluons. Nevertheless, we usually don’t observe the quarks and gluons--we see hadrons. This creates problems--problems that lead directly to the outstanding issue facing QCD, that of quark and gluon confinement. Some processes, such as e+e annihilation into \(q\bar q\) or \(q\bar qg\) appear to permit a relatively easy description in terms of the quark and gluon language. Take the man in the street to a typical PEP or PETRA experiment and show him the on-line displays of two- and three-jet events, and he may well get the idea. He needn’t be a theorist or even experimentalist to be able to see the quarks and gluons. In fact, he would do almost as well as the professionals in deciding which of the three jets is the gluon.


Soft Gluon High Energy Collision Inclusive Spectrum Initial Energy Density Local Sound Velocity 
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Copyright information

© Plenum Press, New York 1983

Authors and Affiliations

  • J. D. Bjorken
    • 1
  1. 1.Fermi National Accelerator LaboratoryBataviaUSA

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